E34 : [JPOUG Presents] Oracle Database の隠されている様々な謎を解くセッション「なーんでだ？」再び @ db tech showcase 2015 Tokyo

5
COLUMN_NAME DATA_TYPE
-------------------- ------------
ID NUMBER
DATA1 VARCHAR2
DATA2 VARCHAR2
INDEX_NAME COLUMN_NAME DESC
-------------------- ------------ ----
PK_A ID ASC
COLUMN_NAME DATA_TYPE
-------------------- ----------------
ID NUMBER
BR# NUMBER
DATA1 VARCHAR2
DATA2 VARCHAR2
INDEX_NAME COLUMN_NAME DESC
-------------------- --------------- ----
PK_B ID ASC
PK_B BR# ASC
TABLE_NAME NUM_ROWS
----------------- ----------
A 100
B 300
⬇

∼
6
SELECT
/*+
LEADING(a b)
USE_NL(a b)
*/
a.id
,b.br#
,SUBSTR(a.data1, 10) AS a_data1
,SUBSTR(b.data1, 10) AS b_data1
FROM
a INNER JOIN b
ON
a.id = b.id
WHERE
a.id BETWEEN 1 AND 5
ORDER BY
a.id
,b.br#;
SELECT
/*+
LEADING(b a)
USE_NL(b a)
*/
a.id
,b.br#
FROM
a INNER JOIN b
ON
a.id = b.id
WHERE
ORDER BY
a.id
,b.br#;
⬆
？⏬

SELECT
a.id
,b.br#
FROM
a INNER JOIN b
ON
a.id = b.id
WHERE
ORDER BY
a.id
,b.br#;
7

SQL Plan Monitoring Details (Plan Hash Value=757367763)
============================================================================================================
| Id | Operation | Name |・| Time | Start | Execs | Rows | Mem |・|
| | | |・| Active(s) | Active | | (Actual) | (Max) |・|
=============================================================================================================
| 0 | SELECT STATEMENT | |・| 1 | +0 | 1 | 15 | |・|
| 1 | SORT ORDER BY | |・| 1 | +0 | 1 | 15 | 129K |・|
| 2 | NESTED LOOPS | |・| 1 | +0 | 1 | 15 | |・|
| 3 | NESTED LOOPS | |・| 1 | +0 | 1 | 15 | |・|
| 4 | TABLE ACCESS BY INDEX ROWID BATCHED | A |・| 1 | +0 | 1 | 5 | |・|
| 5 | INDEX RANGE SCAN | PK_A |・| 1 | +0 | 1 | 5 | |・|
| 6 | INDEX RANGE SCAN | PK_B |・| 1 | +0 | 5 | 15 | |・|
| 7 | TABLE ACCESS BY INDEX ROWID | B |・| 1 | +0 | 15 | 15 | |・|
=============================================================================================================
8 ⬆

============================================================================================================
| Id | Operation | Name |・| Time | Start | Execs | Rows | Mem |・|
| | | |・| Active(s) | Active | | (Actual) | (Max) |・|
=============================================================================================================
| 0 | SELECT STATEMENT | |・| 1 | +0 | 1 | 15 | |・|
| 1 | SORT ORDER BY | |・| 1 | +0 | 1 | 15 | 129K |・|
| 2 | NESTED LOOPS | |・| 1 | +0 | 1 | 15 | |・|
| 3 | NESTED LOOPS | |・| 1 | +0 | 1 | 15 | |・|
| 4 | TABLE ACCESS BY INDEX ROWID BATCHED | A |・| 1 | +0 | 1 | 5 | |・|
| 5 | INDEX RANGE SCAN | PK_A |・| 1 | +0 | 1 | 5 | |・|
| 6 | INDEX RANGE SCAN | PK_B |・| 1 | +0 | 5 | 15 | |・|
| 7 | TABLE ACCESS BY INDEX ROWID | B |・| 1 | +0 | 15 | 15 | |・|
=============================================================================================================
9 ⬆

============================================================================================
| Id | Operation | Name |・| Time | Start | Execs | Rows |・|
| | | |・| Active(s) | Active | | (Actual) |・|
============================================================================================
| 0 | SELECT STATEMENT | |・| 1 | +0 | 1 | 15 |・|
| 1 | NESTED LOOPS | |・| 1 | +0 | 1 | 15 |・|
| 2 | NESTED LOOPS | |・| 1 | +0 | 1 | 15 |・|
| 3 | TABLE ACCESS BY INDEX ROWID | B |・| 1 | +0 | 1 | 15 |・|
| 4 | INDEX RANGE SCAN | PK_B |・| 1 | +0 | 1 | 15 |・|
| 5 | INDEX UNIQUE SCAN | PK_A |・| 1 | +0 | 15 | 15 |・|
| 6 | TABLE ACCESS BY INDEX ROWID | A |・| 1 | +0 | 15 | 15 |・|
============================================================================================
10 ⬆

12
Plan Statistics
Stat Name Statement Per Execution % Snap
---------------------------------------- ---------- -------------- -------
Elapsed Time (ms) 12,645 0.1 76.9
CPU Time (ms) 12,540 0.1 79.1
Executions 100,000 N/A N/A
Buffer Gets 2,300,000 23.0 99.6
Disk Reads 0 0.0 0.0
Parse Calls 1 0.0 0.3
Rows 1,500,000 15.0 N/A
User I/O Wait Time (ms) 0 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 1 N/A N/A
Sharable Mem(KB) 27 N/A N/A
-------------------------------------------------------------
⬆

13
Plan Statistics
Stat Name Statement Per Execution % Snap
---------------------------------------- ---------- -------------- -------
Elapsed Time (ms) 6,972 0.1 68.4
CPU Time (ms) 7,231 0.1 72.9
Executions 100,000 N/A N/A
Buffer Gets 3,500,000 35.0 99.8
Disk Reads 0 0.0 0.0
Parse Calls 1 0.0 0.3
Rows 1,500,000 15.0 N/A
User I/O Wait Time (ms) 0 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 1 N/A N/A
Sharable Mem(KB) 27 N/A N/A
-------------------------------------------------------------
⬆

15
接続されました。
1 declare
2 cursor cs_foobar is
3 select
4 rowid
5 from
6 foobar
7 where
8 id between 1 and 100000
9 order by
10 dbms_rowid.rowid_block_number(rowid)
11 for update;
12 begin
13 for row in cs_foobar loop
14 update foobar
15 set
16 a = lpad('y',1795,'y')
17 where
18 rowid = row.rowid;
19 end loop;
20 commit;
21* end;
PL/SQLプロシージャが正常に完了しました。
経過: 00:03:03.40

16
SQL ordered by Executions DB/Inst: NONPDB12/nonpdb12c Snaps: 21-31
-> End Executions Threshold: 100 Total Executions: 122,051
-> Captured SQL accounts for 16.1% of Total Executions
-> SQL reported below exceeded 1.0% of Total Executions
CPU per Elap per Old
Executions Rows Processed Rows per Exec Exec (s) Exec (s) Hash Value
------------ --------------- ---------------- ----------- ---------- ----------
6,107 5,129 0.8 0.00 0.00 4274598960
select /*+ rule */ bucket_cnt, row_cnt, cache_cnt, null_cnt, tim
estamp#, sample_size, minimum, maximum, distcnt, lowval, hival,
density, col#, spare1, spare2, avgcln from hist_head$ where obj#
=:1 and intcol#=:2
2,656 41,093 15.5 0.00 0.00 343569411
select /*+ rule */ bucket, endpoint, col#, epvalue, epvalue_raw,
ep_repeat_count from histgrm$ where obj#=:1 and intcol#=:2 and
row#=:3 order by bucket
1,858 2,747 1.5 0.00 0.00 2482976222
select intcol#,nvl(pos#,0),col#,nvl(spare1,0) from ccol$ where c
on#=:1

16
SQL ordered by Executions DB/Inst: NONPDB12/nonpdb12c Snaps: 21-31
------------ --------------- ---------------- ----------- ---------- ----------
6,107 5,129 0.8 0.00 0.00 4274598960
=:1 and intcol#=:2
2,656 41,093 15.5 0.00 0.00 343569411
select /*+ rule */ bucket, endpoint, col#, epvalue, epvalue_raw,
ep_repeat_count from histgrm$ where obj#=:1 and intcol#=:2 and
row#=:3 order by bucket
1,858 2,747 1.5 0.00 0.00 2482976222
select intcol#,nvl(pos#,0),col#,nvl(spare1,0) from ccol$ where c
on#=:1
------------ --------------- ---------------- ----------- ---------- ----------
100,000 100,000 1.0 0.00 0.00 3389821460
Module: SQL*Plus
UPDATE FOOBAR SET A = LPAD('y',1795,'y') WHERE ROWID = :B1

19
⏩
STATSPACK report for
Load Profile
Instance Efficiency Indicators
Top 5 Timed Event
Instance CPU
Memory Statistics
Statistic
Foreground Wait Events
Background Wait Events
Wait Events (fg and bg)
Wait Event Histogram
SQL ordered by CPU
SQL ordered by Gets
SQL ordered by Executions
SQL ordered by Parse Calls
Instance Activity Stats
OS Statistics
IO Stat by Function - summary/detail
Tablespace IO Stats
File IO Stats
File Read Histogram Stats
IO Stats Function Detail
Instance Recovery Stats
Memory Dynamic Components
Memory Resize Operations
Buffer Pool Advisory
Buffer Pool Statistics
PGA Aggr Target Stats
PGA Aggr Target Histogram
PGA Memory Advisory
Process Memory Summary Stats
Shared Pool Advisory
Cache Size Changes
SGA Target Advisory
SGA breakdown difference
init.ora Parameters

20
STATSPACK report for
Database DB Id Instance Inst Num Startup Time Release RAC
~~~~~~~~ ----------- ------------ -------- --------------- ----------- ---
4044466261 nonpdb12c 1 31-5月 -15 22:0 12.1.0.2.0 NO
3
Host Name Platform CPUs Cores Sockets Memory (G)
~~~~ ---------------- ---------------------- ----- ----- ------- ------------
foobar Linux x86 64-bit 4 4 1 7.9
Snapshot Snap Id Snap Time Sessions Curs/Sess Comment
~~~~~~~~ ---------- ------------------ -------- --------- ------------------
Begin Snap: 83 31-5月 -15 22:05:54 32 .9
End Snap: 93 31-5月 -15 22:08:53 31 .9
Elapsed: 2.98 (mins) Av Act Sess: 1.0
DB time: 2.95 (mins) DB CPU: 0.96 (mins) ⬆

21
Cache Sizes Begin End
~~~~~~~~~~~ ---------- ----------
Buffer Cache: 532M 524M Std Block Size: 8K
Shared Pool: 172M 180M Log Buffer: 7,432K
Load Profile Per Second Per Transaction Per Exec Per Call
~~~~~~~~~~~~ ------------------ ----------------- ----------- -----------
DB time(s): 1.0 22.1 0.00 3.28
DB CPU(s): 0.3 7.2 0.00 1.06
Redo size: 2,380,617.8 53,266,323.0
Logical reads: 3,113.7 69,668.9
Block changes: 2,952.4 66,059.1
Physical reads: 2,037.4 45,586.9
Physical writes: 1,575.3 35,247.9
User calls: 0.3 6.8
Parses: 9.3 208.8
Hard parses: 2.3 50.9
W/A MB processed: 0.3 6.2
Logons: 0.1 1.1
Executes: 611.5 13,682.0
Rollbacks: 0.0 0.0
Transactions: 0.0
⬆

22
Instance Efficiency Indicators
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 100.00 Redo NoWait %: 100.00
Buffer Hit %: 34.57 Optimal W/A Exec %: 100.00
Library Hit %: 97.70 Soft Parse %: 75.63
Execute to Parse %: 98.47 Latch Hit %: 99.99
Parse CPU to Parse Elapsd %: 98.61 % Non-Parse CPU: 97.60
Shared Pool Statistics Begin End
------ ------
Memory Usage %: 89.03 91.18
% SQL with executions>1: 77.86 79.00
% Memory for SQL w/exec>1: 75.17 78.51
⬆

23
Top 5 Timed Events Avg %Total
~~~~~~~~~~~~~~~~~~ wait Call
Event Waits Time (s) (ms) Time
----------------------------------------- ------------ ----------- ------ ------
LGWR worker group idle 432 478 1105 35.1
lreg timer 63 180 2860 13.2
AQPC idle 6 180 30005 13.2
heartbeat redo informer 179 179 1000 13.2
db file sequential read 200,834 135 1 9.9
-------------------------------------------------------------
Host CPU (CPUs: 4 Cores: 4 Sockets: 1)
~~~~~~~~ Load Average
Begin End User System Idle WIO WCPU
------- ------- ------- ------- ------- ------- --------
0.10 1.02 6.68 2.71 90.44 14.26
Note: There is a 6% discrepancy between the OS Stat total CPU time and
the total CPU time estimated by Statspack
OS Stat CPU time: 675(s) (BUSY_TIME + IDLE_TIME)
Statspack CPU time: 716(s) (Elapsed time * num CPUs in end snap)
⬆

24
Instance CPU
~~~~~~~~~~~~ % Time (seconds)
-------- --------------
Host: Total time (s): 675.4
Host: Busy CPU time (s): 64.6
% of time Host is Busy: 9.6
Instance: Total CPU time (s): 64.0
% of Busy CPU used for Instance: 99.1
Instance: Total Database time (s): 204.2
%DB time waiting for CPU (Resource Mgr): 0.0
Memory Statistics Begin End
~~~~~~~~~~~~~~~~~ ------------ ------------
Host Mem (MB): 8,040.8 8,040.8
SGA use (MB): 768.0 768.0
PGA use (MB): 88.2 90.2
% Host Mem used for SGA+PGA: 10.6 10.7
-------------------------------------------------------------
⬆

25
Statistic Time (s) % DB time
----------------------------------- -------------------- ---------
sql execute elapsed time 177.0 100.0
DB CPU 57.4 32.4
PL/SQL execution elapsed time 3.5 2.0
parse time elapsed 1.9 1.1
hard parse elapsed time 1.9 1.1
connection management call elapsed 0.1 .1
repeated bind elapsed time 0.0 .0
PL/SQL compilation elapsed time 0.0 .0
sequence load elapsed time 0.0 .0
DB time 177.1
background elapsed time 27.1
background cpu time 6.6
-------------------------------------------------------------
⬆

26
-> Only events with Total Wait Time (s) >= .001 are shown
-> ordered by Total Wait Time desc, Waits desc (idle events last)
Avg %Total
%Tim Total Wait wait Waits Call
Event Waits out Time (s) (ms) /txn Time
---------------------------- ------------ ---- ---------- ------ -------- ------
db file sequential read 200,794 0 135 1 ######## 9.9
db file scattered read 1,516 0 8 5 189.5 .6
log file switch completion 4 0 0 24 0.5 .0
control file sequential read 266 0 0 0 33.3 .0
log file switch (private str 2 0 0 23 0.3 .0
log file sync 3 0 0 2 0.4 .0
reliable message 10 0 0 0 1.3 .0
Disk file operations I/O 8 0 0 0 1.0 .0
SQL*Net message from client 26 0 0 1 3.3
------------------------------------------------------------- ⬆

27
Background Wait Events
Avg %Total
---------------------------- ------------ ---- ---------- ------ -------- ------
LGWR worker group idle 432 0 478 1105 54.0 35.1
lreg timer 63 95 180 2860 7.9 13.2
AQPC idle 6 100 180 30005 0.8 13.2
heartbeat redo informer 179 0 179 1000 22.4 13.2
Streams AQ: load balancer id 1 100 120 ###### 0.1 8.8
db file parallel write 2,179 0 16 7 272.4 1.2
log file parallel write 430 0 4 9 53.8 .3
db file async I/O submit 1,119 0 1 1 139.9 .1
control file parallel write 151 0 0 3 18.9 .0
oracle thread bootstrap 7 0 0 18 0.9 .0
Parameter File I/O 16 0 0 3 2.0 .0
db file sequential read 40 0 0 1 5.0 .0
target log write size 2 100 0 10 0.3 .0
direct path write 6 0 0 2 0.8 .0
log file single write 10 0 0 1 1.3 .0
os thread creation 7 0 0 1 0.9 .0
direct path read 5 0 0 1 0.6 .0
log file sequential read 10 0 0 0 1.3 .0
LGWR all worker groups 5 0 0 0 0.6 .0 ⬆

28
Wait Events (fg and bg)
-> s - second, cs - centisecond, ms - millisecond, us - microsecond
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Avg %Total
---------------------------- ------------ ---- ---------- ------ -------- ------
LGWR worker group idle 432 0 478 1105 54.0 35.1
lreg timer 63 95 180 2860 7.9 13.2
AQPC idle 6 100 180 30005 0.8 13.2
heartbeat redo informer 179 0 179 1000 22.4 13.2
Streams AQ: load balancer id 1 100 120 ###### 0.1 8.8
db file parallel write 2,179 0 16 7 272.4 1.2
log file parallel write 430 0 4 9 53.8 .3
db file async I/O submit 1,119 0 1 1 139.9 .1
control file parallel write 151 0 0 3 18.9 .0
oracle thread bootstrap 7 0 0 18 0.9 .0
log file switch (private str 2 0 0 23 0.3 .0
Parameter File I/O 16 0 0 3 2.0 .0
target log write size 2 100 0 10 0.3 .0
direct path write 6 0 0 2 0.8 .0
log file single write 10 0 0 1 1.3 .0
os thread creation 7 0 0 1 0.9 .0
direct path read 5 0 0 1 0.6 .0
log file sync 3 0 0 2 0.4 .0
log file sequential read 10 0 0 0 1.3 .0
LGWR all worker groups 5 0 0 0 0.6 .0
⬆

29
-> Total Waits - units: K is 1000, M is 1000000, G is 1000000000
-> % of Waits - column heading: <=1s is truly <1024ms, >1s is truly >=1024ms
-> % of Waits - value: .0 indicates value was <.05%, null is truly 0
-> Ordered by Event (idle events last)
Total ----------------- % of Waits ------------------
Event Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
-------------------------- ----- ----- ----- ----- ----- ----- ----- ----- -----
AQPC idle 6 100.0
Disk file operations I/O 35 97.1 2.9
LGWR all worker groups 5 100.0
LGWR worker group idle 432 .5 90.7 8.8
Parameter File I/O 16 62.5 12.5 6.3 18.8
Streams AQ: load balancer 1 100.0
asynch descriptor resize 19 100.0
control file parallel writ 151 46.4 46.4 2.0 5.3
control file sequential re 719 96.1 2.1 .8 .1 .7 .1
db file async I/O submit 1119 78.9 16.5 3.1 .7 .5 .1 .1
db file parallel write 2179 42.5 2.5 3.3 3.6 37.4 10.7
db file scattered read 1516 34.4 14.7 1.6 28.4 11.9 9.0
db file sequential read 200K 94.4 4.7 .4 .2 .3 .0
direct path read 5 60.0 40.0
direct path write 6 50.0 50.0
heartbeat redo informer 179 100.0
latch free 1 100.0
latch: cache buffers lru c 1 100.0
latch: shared pool 5 100.0
log file parallel write 430 1.4 .7 41.6 53.7 2.6
log file sequential read 10 100.0
log file single write 10 70.0 30.0
log file switch (private s 2 100.0
log file switch completion 4 100.0
log file sync 3 33.3 66.7
lreg timer 63 4.8 95.2
oracle thread bootstrap 7 14.3 85.7
SQL*Net message to client 32 100.0
⬆

30
SQL ordered by CPU
-> Total DB CPU (s): 57
-> Captured SQL accounts for 3.1% of Total DB CPU
-> SQL reported below exceeded 1.0% of Total DB CPU
CPU CPU per Elapsd Old
Time (s) Executions Exec (s) %Total Time (s) Buffer Gets Hash Value
---------- ------------ ---------- ------ ---------- --------------- ----------
1.02 1 1.02 1.8 1.10 13,200 4269626113
Module: SQL*Plus
BEGIN :snap# := statspack.snap(i_snap_level=>7); END;
⬆

31
SQL ordered by Gets
-> End Buffer Gets Threshold: 10000 Total Buffer Gets: 557,351
-> Captured SQL accounts for 5.8% of Total Buffer Gets
-> SQL reported below exceeded 1.0% of Total Buffer Gets
CPU Elapsd Old
Buffer Gets Executions Gets per Exec %Total Time (s) Time (s) Hash Value
--------------- ------------ -------------- ------ -------- --------- ----------
13,200 1 13,200.0 2.4 1.02 1.10 4269626113
Module: SQL*Plus
BEGIN :snap# := statspack.snap(i_snap_level=>7); END;
7,130 2,399 3.0 1.3 0.12 0.16 4274598960
=:1 and intcol#=:2
⬆

32
SQL ordered by Executions
------------ --------------- ---------------- ----------- ---------- ----------
2,399 2,327 1.0 0.00 0.00 4274598960
=:1 and intcol#=:2
⬆

33
SQL ordered by Parse Calls
-> End Parse Calls Threshold: 1000 Total Parse Calls: 1,670
-> Captured SQL accounts for 69.0% of Total Parse Calls
-> SQL reported below exceeded 1.0% of Total Parse Calls
% Total Old
Parse Calls Executions Parses Hash Value
------------ ------------ -------- ----------
210 210 12.57 2018736380
select timestamp, flags from fixed_obj$ where obj#=:1
139 139 8.32 1198893840
select order#,columns,types from access$ where d_obj#=:1
139 139 8.32 2824870641
select owner#,name,namespace,remoteowner,linkname,p_timestamp,p_
obj#, nvl(property,0),subname,type#,flags,d_attrs from dependenc
y$ d, obj$ o where d_obj#=:1 and p_obj#=obj#(+) order by order#
117 117 7.01 4118814203
select decode(u.type#, 2, u.ext_username, u.name), o.name,
t.update$, t.insert$, t.delete$, t.enabled, decode(bita
nd(t.property, 8192),8192, 1, 0), decode(bitand(t.propert
y, 65536), 65536, 1, 0), decode(bitand(t.property, 131072)
112 112 6.71 1512023764
select obj#, name, stab#, sobj#, sobjd#, ttab#, tobj#, tobjd#, m
flags from rmtab$ where (stab# = :1 or ttab# = :1) order by obj#
⬆

34
Statistic Total per Second per Trans
--------------------------------- ------------------ -------------- ------------
rollback changes - undo records a 0 0.0 0.0
rollbacks only - consistent read 0 0.0 0.0
rows fetched via callback 678 3.8 84.8
session connect time 180 1.0 22.5
session cursor cache hits 43,551 243.3 5,443.9
session logical reads 557,351 3,113.7 69,668.9
session pga memory 2,362,616 13,199.0 295,327.0
session pga memory max 1,576,184 8,805.5 197,023.0
session uga memory 400,216 2,235.8 50,027.0
session uga memory max 21,289,200 118,934.1 2,661,150.0
shared hash latch upgrades - no w 160 0.9 20.0
shared io pool buffer get success 0 0.0 0.0
sorts (memory) 2,984 16.7 373.0
sorts (rows) 127,277 711.0 15,909.6
sql area evicted 218 1.2 27.3
sql area purged 0 0.0 0.0
summed dirty queue length 415,865 2,323.3 51,983.1
switch current to new buffer 3 0.0 0.4
⬆

35
OS Statistics
-> ordered by statistic type (CPU use, Virtual Memory, Hardware Config), Name
Statistic Total
------------------------- ----------------------
SWAP_FREE_BYTES 2,113,925,120
BUSY_TIME 6,460
IDLE_TIME 61,078
IOWAIT_TIME 9,632
SYS_TIME 1,830
USER_TIME 4,511
PHYSICAL_MEMORY_BYTES 8,431,374,336
NUM_CPUS 4
NUM_CPU_CORES 4
NUM_CPU_SOCKETS 1
GLOBAL_RECEIVE_SIZE_MAX 4,194,304
GLOBAL_SEND_SIZE_MAX 1,048,576
TCP_RECEIVE_SIZE_DEFAULT 87,380
TCP_RECEIVE_SIZE_MAX 6,291,456
TCP_RECEIVE_SIZE_MIN 4,096
TCP_SEND_SIZE_DEFAULT 16,384
TCP_SEND_SIZE_MAX 4,194,304
TCP_SEND_SIZE_MIN 4,096
OS Statistics - detail
Snap Snapshot
Id Day Time Load %Busy %User %System %WIO %WCPU
------ --------------- ------ ------ ------ ------- ------ ------
83 日 31 22:05:54 .1
93 日 31 22:08:53 1.0 9.6 6.7 2.7 14.3 ⬆

36
IO Stat by Function - summary
->Data Volume values suffixed with M,G,T,P are in multiples of 1024,
other values suffixed with K,M,G,T,P are in multiples of 1000
->ordered by Data Volume (Read+Write) desc
---------- Read --------- --------- Write -------- --- Wait ----
Data Requests Data Data Requests Data Avg
Function Volume /sec Vol/sec Volume /sec Vol/sec Count Tm(ms)
--------------- ------ -------- -------- ------ -------- -------- ------ ------
Buffer Cache Re 2849M 1130.3 15.9M 202K 0.0
LGWR 1M .3 .0M 423M 4.7 2.4M 552 0.0
Others 10M 3.8 .1M 3M 1.2 .0M 789 0.0
Direct Reads 1M .1 .0M .0 0.0
Direct Writes .0 .1 0.0
-------------------------------------------------------------
IO Stat by Function - detail
->ordered by Data Volume (Read+Write) desc
----------- Read ---------- ----------- Write ---------
Small Large Small Large Small Large Small Large
Read Read Data Data Write Write Data Data
Function Reqs Reqs Read Read Reqs Reqs Writn Writn
------------------ ------ ------ ------ ------ ------ ------ ------ ------
Buffer Cache Reads 201K 1436 1575M 1274M
LGWR 62 1M 332 513 5M 418M
Others 677 10M 214 3M
Direct Reads 19 1M 2
Direct Writes 2 19
-------------------------------------------------------------
⬆

37
Tablespace IO Stats
->ordered by IOs (Reads + Writes) desc
Tablespace
------------------------------
Av Av Av Av Buffer Av Buf
Reads Reads/s Rd(ms) Blks/Rd Writes Writes/s Waits Wt(ms)
-------------- ------- ------ ------- ------------ -------- ---------- ------
USERS
201,520 1,126 0.7 1.8 18,970 106 0 0.0
UNDOTBS1
9 0 1.1 1.0 1,107 6 0 0.0
SYSAUX
340 2 0.3 1.0 196 1 0 0.0
SYSTEM
478 3 0.4 1.0 28 0 0 0.0
EXAMPLE
3 0 0.0 1.0 3 0 0 0.0
——————————————————————————————
⬆

38
File IO Stats
->Mx Rd Bkt: Max bucket time for single block read
->ordered by Tablespace, File
Tablespace Filename
------------------------ ----------------------------------------------------
Av Mx Av
Av Rd Rd Av Av Buffer BufWt
Reads Reads/s (ms) Bkt Blks/Rd Writes Writes/s Waits (ms)
-------------- ------- ----- --- ------- ------------ -------- ---------- ------
EXAMPLE /u01/oradata/nonpdb12c/example01.dbf
3 0 0.0 1.0 3 0 0
SYSAUX /u01/oradata/nonpdb12c/sysaux01.dbf
340 2 0.3 1 1.0 196 1 0
SYSTEM /u01/oradata/nonpdb12c/system01.dbf
478 3 0.4 1 1.0 28 0 0
UNDOTBS1 /u01/oradata/nonpdb12c/undotbs01.dbf
9 0 1.1 1 1.0 1,107 6 0
USERS /u01/oradata/nonpdb12c/users01.dbf
201,520 1,126 0.7 1 1.8 18,970 106 0
-------------------------------------------------------------
⬆

39
File Read Histogram Stats
->Number of single block reads in each time range
->Tempfiles are not included
->ordered by Tablespace, File
Tablespace Filename
------------------------ ----------------------------------------------------
0 - 2 ms 2 - 4 ms 4 - 8 ms 8 - 16 ms 16 - 32 ms 32+ ms
------------ ------------ ------------ ------------ ------------ ------------
SYSAUX /u01/oradata/nonpdb12c/sysaux01.dbf
333 0 0 0 0 0
SYSTEM /u01/oradata/nonpdb12c/system01.dbf
459 0 0 0 0 0
UNDOTBS1 /u01/oradata/nonpdb12c/undotbs01.dbf
6 0 0 0 0 0
USERS /u01/oradata/nonpdb12c/users01.dbf
188,707 0 0 0 0 0
⬆

40
IO Stats Function Detail
Small Small Large Large
Function FileType Read Write Read Write Wait Time
Name Name (MB) (MB) (MB) (MB) Waits (ms)
------------ ------------ ------- ------- ------- ------- --------- -----------
DBWR Control File 0 0 0 0 0 0
DBWR Data File 0 84 0 2117 0 0
LGWR Control File 1 2 0 0 52 26
LGWR Data File 0 0 0 0 0 0
LGWR Log File 0 3 0 418 20 15
LGWR Other(8) 0 0 0 0 480 3903
Streams AQ Data File 0 0 0 0 0 0
Buffer Cache Data File 1575 0 1274 0 202331 147785
Buffer Cache Other(8) 0 0 0 0 0 0
Direct Reads Data File 1 0 0 0 0 0
Others(14) Control File 10 3 0 0 671 272
Others(14) Data File 0 0 0 0 0 0
Others(14) Other(8) 0 0 0 0 102 296
Others(14) Parameter Fi 0 0 0 0 16 42
Others(14) External Tab 0 0 0 0 0 0
0 0 0 0 0 0 ⬆

41
Instance Recovery Stats
-> B: Begin snapshot, E: End snapshot
Targt Estd Log File Log Ckpt Log Ckpt
MTTR MTTR Recovery Actual Target Size Timeout Interval
(s) (s) Estd IOs Redo Blks Redo Blks Redo Blks Redo Blks Redo Blks
- ----- ----- ---------- --------- --------- ---------- --------- ------------
B 0 8 424 3469 331776 331776
E 0 45 44244 287011 331776 331776
-------------------------------------------------------------
⬆

42
Memory Dynamic Components
-> Op - memory resize Operation
-> Cache: D: Default, K: Keep, R: Recycle
-> Mode: DEF: DEFerred mode, IMM: IMMediate mode
Begin Snap End Snap Op Last Op
Cache Size (M) Size (M) Count Type/Mode Last Op Time
---------------------- ---------- -------- ------- ---------- ---------------
D:buffer cache 532 524 1 SHRINK/DEF 31-5月 22:05:5
7
PGA Target 768 0 STATIC
SGA Target 768 0 STATIC
Shared IO Pool 28 0 GROW/IMM 31-5月 22:03:5
5
java pool 4 0 STATIC
large pool 20 0 SHRINK/DEF 31-5月 22:04:2
7
shared pool 172 180 1 GROW/DEF 31-5月 22:05:5
7 ⬆

43
Memory Resize Operations
-> Status: ERR: ERRor, COM: COMplete, PEN: PENding
-> Delta - Target change in size (MB)
-> Num Ops - number of identical Operations initiated concurrently
Elap Init Delta(M) Final Num
Start Time (s) Cache Size(M) & Mode Size(M) Sta Ops
------------- ----- -------------- -------- --------- -------- --- -----
0531 22:05:57 0 D:buffer cache 532 -8 DEF 524 COM 1
0531 22:05:57 0 shared pool 172 +8 DEF 180 COM 1
-------------------------------------------------------------
⬆

44
Buffer Pool Advisory
-> Only rows with estimated physical reads >0 are displayed
-> ordered by Pool, Block Size, Buffers For Estimate
Est
Phys Estimated Est
Size for Size Buffers Read Phys Reads Est Phys % dbtime
P Est (M) Factr (thousands) Factr (thousands) Read Time for Rds
--- -------- ----- ------------ ------ -------------- ------------ --------
D 52 .1 6 1.0 375 148 48.8
D 104 .2 13 1.0 374 147 48.5
D 156 .3 19 1.0 374 147 48.5
D 208 .4 25 1.0 374 147 48.5
D 260 .5 32 1.0 374 147 48.5
D 312 .6 38 1.0 374 147 48.5
D 364 .7 45 1.0 374 147 48.5
D 416 .8 51 1.0 374 147 48.5
D 468 .9 57 1.0 374 147 48.5
D 520 1.0 64 1.0 374 147 48.5
D 524 1.0 64 1.0 374 147 48.5
D 572 1.1 70 1.0 374 147 48.5
D 624 1.2 76 1.0 374 147 48.5
D 676 1.3 83 1.0 374 147 48.5
D 728 1.4 89 1.0 374 147 48.5
D 780 1.5 96 1.0 374 147 48.5
D 832 1.6 102 1.0 374 147 48.5
D 884 1.7 108 1.0 357 135 44.6
D 936 1.8 115 0.9 333 119 39.3
D 988 1.9 121 0.8 306 101 33.3
D 1,040 2.0 127 0.8 284 86 28.4 ⬆

45
Buffer Pool Statistics
-> Standard block size Pools D: default, K: keep, R: recycle
-> Default Pools for other block sizes: 2k, 4k, 8k, 16k, 32k
-> Buffers: the number of buffers. Units of K, M, G are divided by 1000
Free Writ Buffer
Pool Buffer Physical Physical Buffer Comp Busy
P Buffers Hit% Gets Reads Writes Waits Wait Waits
--- ------- ---- -------------- ------------ ----------- ------- ---- ----------
D 64K 35 558,026 364,662 281,962 0 0 0
-------------------------------------------------------------
⬆

46
PGA Aggr Target Stats
-> B: Begin snap E: End snap (rows identified with B or E contain data
which is absolute i.e. not diffed over the interval)
-> PGA cache hit % - percentage of W/A (WorkArea) data processed only in-memory
-> Auto PGA Target - actual workarea memory target
-> W/A PGA Used - amount of memory used for all WorkAreas (manual + auto)
-> %PGA W/A Mem - percentage of PGA memory allocated to WorkAreas
-> %Auto W/A Mem - percentage of WorkArea memory controlled by Auto Mem Mgmt
-> %Man W/A Mem - percentage of WorkArea memory under Manual control
PGA Cache Hit % W/A MB Processed Extra W/A MB Read/Written
--------------- ---------------- -------------------------
100.0 49 0
%PGA %Auto %Man
PGA Aggr Auto PGA PGA Mem W/A PGA W/A W/A W/A Global Mem
Target(M) Target(M) Alloc(M) Used(M) Mem Mem Mem Bound(K)
- --------- --------- ---------- ---------- ------ ------ ------ ----------
B 768 647 88.2 0.0 .0 .0 .0 102,400
E 768 646 90.2 0.0 .0 .0 .0 102,400
------------------------------------------------------------- ⬆

47
PGA Aggr Target Histogram
-> Optimal Executions are purely in-memory operations
Low High
Optimal Optimal Total Execs Optimal Execs 1-Pass Execs M-Pass Execs
------- ------- -------------- ------------- ------------ ------------
2K 4K 1,539 1,539 0 0
64K 128K 8 8 0 0
128K 256K 3 3 0 0
256K 512K 2 2 0 0
512K 1024K 27 27 0 0
1M 2M 10 10 0 0
2M 4M 1 1 0 0
4M 8M 2 2 0 0
-------------------------------------------------------------
⬆

48
PGA Memory Advisory
-> When using Auto Memory Mgmt, minimally choose a pga_aggregate_target value
where Estd PGA Overalloc Count is 0
Estd Extra Estd
PGA Aggr W/A MB Estd Time PGA Estd PGA
Target Size W/A MB Read/Written to Process Cache Overalloc
Est (MB) Factr Processed to Disk Bytes (s) Hit % Count
---------- ------ -------------- -------------- ---------- ------ ----------
96 0.1 110 0 0.1 100.0 0
192 0.3 110 0 0.1 100.0 0
384 0.5 110 0 0.1 100.0 0
576 0.8 110 0 0.1 100.0 0
768 1.0 110 0 0.1 100.0 0
922 1.2 110 0 0.1 100.0 0
1,075 1.4 110 0 0.1 100.0 0
1,229 1.6 110 0 0.1 100.0 0
1,382 1.8 110 0 0.1 100.0 0
1,536 2.0 110 0 0.1 100.0 0
2,304 3.0 110 0 0.1 100.0 0
3,072 4.0 110 0 0.1 100.0 0
4,608 6.0 110 0 0.1 100.0 0
⬆

49
Process Memory Summary Stats
-> B: Begin snap E: End snap
-> All rows below contain absolute values (i.e. not diffed over the interval)
-> Max Alloc is Maximum PGA Allocation size at snapshot time
Hist Max Alloc is the Historical Max Allocation for still-connected processes
-> Num Procs or Allocs: For Begin/End snapshot lines, it is the number of
processes. For Category lines, it is the number of allocations
-> ordered by Begin/End snapshot, Alloc (MB) desc
Hist Num
Avg Std Dev Max Max Procs
Alloc Used Freeabl Alloc Alloc Alloc Alloc or
Category (MB) (MB) (MB) (MB) (MB) (MB) (MB) Allocs
- -------- --------- --------- -------- -------- ------- ------- ------ ------
B -------- 88.2 49.8 19.9 1.8 2.6 15 15 50
Other 66.5 1.3 1.7 11 11 50
Freeable 20.0 .0 1.5 1.9 7 13
SQL .9 .1 .1 .1 0 4 12
PL/SQL .8 .7 .0 .1 0 0 32
E -------- 90.3 50.9 19.8 1.8 2.8 15 15 49
Other 68.7 1.4 1.9 11 11 49
Freeable 19.8 .0 1.5 1.8 7 13
SQL .9 .2 .1 .1 0 3 11
PL/SQL .8 .7 .0 .1 0 0 31 ⬆

50
-> SP: Shared Pool Est LC: Estimated Library Cache Factr: Factor
-> Note there is often a 1:Many correlation between a single logical object
in the Library Cache, and the physical number of memory objects associated
with it. Therefore comparing the number of Lib Cache objects (e.g. in
v$librarycache), with the number of Lib Cache Memory Objects is invalid
Est LC Est LC Est LC Est LC
Shared SP Est LC Time Time Load Load Est LC
Pool Size Size Est LC Saved Saved Time Time Mem
Size (M) Factr (M) Mem Obj (s) Factr (s) Factr Obj Hits
---------- ----- -------- ------------ ------- ------ ------- ------ -----------
180 1.0 15 992 187 1.0 5 1.0 40,197
184 1.0 19 1,200 187 1.0 5 1.0 40,313
188 1.0 23 1,406 187 1.0 5 1.0 40,585
192 1.1 26 1,639 187 1.0 5 1.0 40,809
196 1.1 29 1,828 187 1.0 5 1.0 40,881
200 1.1 32 2,040 187 1.0 5 1.0 40,905
204 1.1 36 2,129 187 1.0 5 1.0 40,920
208 1.2 40 2,245 187 1.0 5 1.0 40,939
212 1.2 44 2,413 187 1.0 5 1.0 40,963
216 1.2 48 2,595 187 1.0 5 1.0 40,976
220 1.2 52 2,791 187 1.0 5 1.0 40,985
240 1.3 64 3,474 187 1.0 5 1.0 40,996
260 1.4 64 3,474 187 1.0 5 1.0 40,996
280 1.6 64 3,474 187 1.0 5 1.0 40,996
300 1.7 64 3,474 187 1.0 5 1.0 40,996
320 1.8 64 3,474 187 1.0 5 1.0 40,996
340 1.9 64 3,474 187 1.0 5 1.0 40,996
360 2.0 64 3,474 187 1.0 5 1.0 40,996
⬆

51
Cache Size Changes
-> Not all cache size changes may be captured. Only cache changes which are
evident at snapshot time are shown
Snap Prior New Difference
Id Cache Size (MB) Size (MB) (MB)
------ ------------ --------- --------- ----------
93 Buffer Cache 532 524 -8
Shared Pool 172 180 8
——————————————————————————————
SGA Target Advisory
SGA Target SGA Size Est DB Est DB Est Physical
Size (M) Factor Time (s) Time Factor Reads
---------- -------- -------- ----------- --------------
192 .3 169 .6 344,392
384 .5 303 1.0 344,426
576 .8 303 1.0 344,426
768 1.0 303 1.0 344,392
960 1.3 303 1.0 344,392
1,152 1.5 276 .9 303,099
1,344 1.8 258 .9 276,788
1,536 2.0 258 .9 276,788 ⬆

52
SGA breakdown difference
-> Top 35 rows by size, ordered by Pool, Name (note rows with null values for
Pool column, or Names showing free memory are always shown)
-> Null value for Begin MB or End MB indicates the size of that Pool/Name was
insignificant, or zero in that snapshot
Pool Name Begin MB End MB % Diff
------ ------------------------------ -------------- -------------- --------
shared ASH buffers 8.0 8.0 0.00
shared KCB Table Scan Buffer 3.8 3.8 0.00
shared KGLH0 3.6 5.7 56.14
shared KGLS 4.1 ########
shared KGLSG 5.0 5.0 0.00
shared KQR L PO 2.1 ########
shared KSFD SGA I/O b 3.8 3.8 0.00
shared KTI-UNDO 3.4 3.4 0.00
shared Multiblock Index SO 3.7 3.7 0.00
shared SGA - SWRF Metric CHBs 2.5 2.5 0.00
shared SQLA 2.1 4.9 133.58
shared db_block_hash_buckets 2.8 2.8 0.00
shared event statistics per sess 6.7 6.7 0.00
shared free memory 18.9 15.9 -15.84
shared imc buf hdl 2.2 2.2 0.00
shared row cache 8.2 8.2 0.00
shared write state object 2.7 2.7 0.00
buffer_cache 532.0 524.0 -1.50 ⬆

53
init.ora Parameters
End value
Parameter Name Begin value (if different)
----------------------------- --------------------------------- --------------
audit_file_dest /u01/admin/nonpdb12c/adump
audit_trail NONE
compatible 12.1.0.2.0
control_files /u01/oradata/nonpdb12c/control01.
ctl, /u01/fast_recovery_area/nonp
db12c/control02.ctl
db_block_size 8192
db_domain
db_name nonpdb12
db_recovery_file_dest /u01/fast_recovery_area
db_recovery_file_dest_size 4781506560
db_unique_name nonpdb12c
diagnostic_dest /u01
dispatchers (PROTOCOL=TCP) (SERVICE=nonpdb12c
XDB)
filesystemio_options SETALL
inmemory_size 0
local_listener LISTENER_NONPDB12C
log_buffer 7610368
memory_max_target 0
memory_target 0
nls_language JAPANESE
nls_territory JAPAN
open_cursors 300
pga_aggregate_target 805306368
processes 300
remote_login_passwordfile EXCLUSIVE
resource_limit FALSE
resource_manager_plan SCHEDULER[0x4449]:DEFAULT_MAINTEN
ANCE_PLAN
sga_max_size 805306368
sga_target 805306368
shared_pool_size 0
undo_tablespace UNDOTBS1
-------------------------------------------------------------
⬆

54
------------ --------------- ---------------- ----------- ---------- ----------
6,107 5,129 0.8 0.00 0.00 4274598960
=:1 and intcol#=:2

55
Avg %Total
---------------------------- ------------ ---- ---------- ------ -------- ------
free buffer waits 12 0 0 9 1.2 .0
kksfbc child completion 1 100 0 50 0.1 .0
library cache load lock 2 0 0 14 0.2 .0
latch: shared pool 50 0 0 0 5.0 .0

56
Snapshot Snap Id Snap Time Sessions Curs/Sess Comment
~~~~~~~~ ---------- ------------------ -------- --------- ------------------
Begin Snap: 83 31-5月 -15 22:05:54 32 .9
End Snap: 93 31-5月 -15 22:08:53 31 .9
Elapsed: 2.98 (mins) Av Act Sess: 1.0
DB time: 2.95 (mins) DB CPU: 0.96 (mins)

57
PERFSTAT> select snap_id from STATS$SNAPSHOT order by snap_id;
SNAP_ID
----------
11
21
31

57
PERFSTAT> select snap_id from STATS$SNAPSHOT order by snap_id;
SNAP_ID
----------
11
21
31
PERFSTAT> select sequence_name,cache_size from user_sequences;
SEQUENCE_NAME CACHE_SIZE
------------------------------ ----------
STATS$SNAPSHOT_ID 10

59
--------------------------------- ------------------ -------------- ------------
・・・略・・・
CCursor + sql area evicted 682 3.7 68.2
・・・略・・・

60
--------------------------------- ------------------ -------------- ------------
・・・略・・・
・・・略・・・

61
--------------------------------- ------------------ -------------- ------------
・・・略・・・
・・・略・・・

62
--------------------------------- ------------------ -------------- ------------
・・・略・・・
・・・略・・・

63
Est LC Est LC Est LC Est LC
Shared SP Est LC Time Time Load Load Est LC
Pool Size Size Est LC Saved Saved Time Time Mem
Size (M) Factr (M) Mem Obj (s) Factr (s) Factr Obj Hits
---------- ----- -------- ------------ ------- ------ ------- ------ -----------
204 1.0 18 1,102 3,502 1.0 17 1.0 219,030
208 1.0 21 1,284 3,505 1.0 14 .8 219,611
212 1.0 25 1,494 3,506 1.0 13 .8 220,078
216 1.1 28 1,671 3,508 1.0 11 .6 220,696
220 1.1 31 1,839 3,509 1.0 10 .6 221,113
224 1.1 34 1,995 3,510 1.0 9 .5 221,613
228 1.1 37 2,207 3,511 1.0 8 .5 221,944
232 1.1 40 2,384 3,511 1.0 8 .5 222,101
236 1.2 44 2,617 3,511 1.0 8 .5 222,322
240 1.2 45 2,713 3,512 1.0 7 .4 222,489
252 1.2 55 3,248 3,513 1.0 6 .4 222,759
276 1.4 76 4,110 3,514 1.0 5 .3 223,040
300 1.5 99 5,146 3,514 1.0 5 .3 223,133
324 1.6 108 5,717 3,514 1.0 5 .3 223,134
348 1.7 108 5,717 3,514 1.0 5 .3 223,134

64
Cache Sizes Begin End
~~~~~~~~~~~ ---------- ----------
Buffer Cache: 460M 452M Std Block Size: 8K
Shared Pool: 196M 204M Log Buffer: 7,432K

67
SQL ordered by CPU DB/Inst: NONPDB12/nonpdb12c Snaps: 103-104
-> Total DB CPU (s): 59
-> Captured SQL accounts for 191.7% of Total DB CPU
-> SQL reported below exceeded 1.0% of Total DB CPU
CPU CPU per Elapsd Old
Time (s) Executions Exec (s) %Total Time (s) Buffer Gets Hash Value
---------- ------------ ---------- ------ ---------- --------------- ----------
57.11 1 57.11 96.0 183.84 520,249 985249325
Module: SQL*Plus
declare cursor cs_foobar is select
rowid from
foobar where id be
tween 1 and 100000 order by
27.03 100,000 0.00 45.4 84.33 153,711 3389821460
Module: SQL*Plus
UPDATE FOOBAR SET A = LPAD('y',1795,'y') WHERE ROWID = :B1
25.32 1 25.32 42.6 90.92 366,391 741139910
Module: SQL*Plus
SELECT ROWID FROM FOOBAR WHERE ID BETWEEN 1 AND 100000 ORDER BY
DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID) FOR UPDATE

👻
68
Data Dictionary
Cache
Server Result
Cache
Other
Library Cache
Shared SQL Area
Reserved
Pool
Shared Pool

73
Top 10 Foreground Events by Total Wait Time
Enqueue Activity
Segments by Row Lock Waits
Top SQL with Top Events
Wait Event Histogram Detail (64 msec to 2 sec)
Wait Event Histogram Detail (4 sec to 2 min)
⏬

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Total Wait Wait % DB Wait
Event Waits Time (sec) Avg(ms) time Class
------------------------------ ----------- ---------- ---------- ------ --------
DB CPU 80.2 48.2
enq: TX - row lock contention 5,763 51.6 8.96 31.1 Applicat
resmgr:cpu quantum 420 1.8 4.38 1.1 Schedule
latch free 177 1.1 6.41 .7 Other
latch: enqueue hash chains 176 .7 3.92 .4 Other
log file switch (checkpoint in 37 .7 17.88 .4 Configur
log file sync 67 .4 6.65 .3 Commit
latch: shared pool 27 .2 7.72 .1 Concurre
Disk file operations I/O 45 .1 2.78 .1 User I/O
cursor: pin S 35 .1 2.30 .0 Concurre
・・・・・
74
⬆

Enqueue Activity
-> only enqueues with requests are shown
-> Enqueue stats gathered prior to 10g should not be compared with 10g data
-> ordered by Wait Time desc, Waits desc, Requests desc
Enqueue Type (Request Reason)
------------------------------------------------------------------------------
Requests Succ Gets Failed Gets Waits Wt Time (s) Av Wt Time(ms)
------------ ------------ ----------- ----------- ------------ --------------
TX-Transaction (row lock contention)
5,758 5,765 0 5,763 53 9.16
HW-Segment High Water Mark
64 64 0 2 0 5.00
TM-DML
76,240 76,240 0 0 0 N/A
75
⬆

-> % of Capture shows % of row lock waits for each top segment compared
-> with total row lock waits for all segments captured by the Snapshot
-> When ** MISSING ** occurs, some of the object attributes may not be available
Tablespace
Owner Name
-------------------- ----------
Row
Subobject Obj. Lock % of
Object Name Name Type Obj# Dataobj# Waits Capture
-------------------- ---------- ----- ---------- ---------- ------------ -------
SCOTT DBTS2014
LOCK_TABLE TABLE 96743 96743 5,748 100.00
------------------------------------------------------
76
⬆

-> Top SQL statements by DB Time along with the top events by DB Time
for those SQLs.
-> % Activity is the percentage of DB Time due to the SQL.
-> % Event is the percentage of DB Time due to the event that the SQL is
waiting on.
-> % Row Source is the percentage of DB Time due to the row source for the
SQL waiting on the event.
-> Executions is the number of executions of the SQL that were sampled in ASH.
SQL ID Plan Hash Executions % Activity
----------------------- -------------------- -------------------- --------------
% Row
Event % Event Top Row Source Source
------------------------------ ------- --------------------------------- -------
btxfn6y1htqsd 2069818805 6 61.54
enq: TX - row lock contention 38.46 UPDATE 38.46
UPDATE LOCK_TABLE SET STATUS=1 WHERE ID = :B1
CPU + Wait for CPU 23.08 UPDATE STATEMENT 15.38
・・・・
77
⬆

-> s - second, ms - millisecond - 1000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Total
%Time Wait Avg Waits % DB
Event Waits -outs Time (s) wait (ms) /txn time
-------------------------- ----------- ----- -------- ---------- -------- ------
enq: TX - row lock content 5,763 52 8.96 0.1 31.1
resmgr:cpu quantum 420 2 4.38 0.0 1.1
latch free 177 1 6.41 0.0 .7
latch: enqueue hash chains 176 1 3.92 0.0 .4
・・・・・
78
⬆

-> Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
-> % of Waits: value of .0 indicates value was <.05%; value of null is truly 0
-> % of Waits: column heading of <=1s is truly <1024ms, >1s is truly >=1024ms
% of Waits
-----------------------------------------------
Total
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
・・・・・
buffer busy waits 37 64.9 13.5 13.5 5.4 2.7
cursor: pin S 35 71.4 14.3 11.4 2.9
db file async I/O submit 17 17.6 29.4 47.1 5.9
db file sequential read 183 76.0 14.8 8.7 .5
enq: TX - row lock conten 5763 26.4 22.6 23.4 17.4 8.0 2.0 .2 .0
・・・・・
79
⬆

-> Units for % of Total Waits:
ms is milliseconds
s is 1024 milliseconds (approximately 1 second)
-> % of Total Waits: total waits for all wait classes, including Idle
-> % of Total Waits: value of .0 indicates value was <.05%;
value of null is truly 0
-> Ordered by Event (only non-idle events are displayed)
% of Total Waits
-----------------------------------------------
Waits
64ms
Event to 2s <32ms <64ms <1/8s <1/4s <1/2s <1s <2s >=2s
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
db file async I/O submit 1 94.1 5.9
enq: TX - row lock conten 12 99.8 .2 .0 .0
latch free 1 99.5 .5
log file parallel write 4 99.9 .1
oracle thread bootstrap 3 50.0 16.7 16.7 16.7
------------------------------------------------------
80
⬆

m is 64*1024 milliseconds (approximately 67 seconds or 1.1 minutes)
% of Total Waits
-----------------------------------------------
Waits
4s
Event to 2m <2s <4s <8s <16s <32s < 1m < 2m >=2m
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
enq: TX - row lock conten 1 100.0 .0
------------------------------------------------------
81
⬆

82
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
------------------------------ ----------- ---------- ---------- ------ --------
DB CPU 80.2 48.2
resmgr:cpu quantum 420 1.8 4.38 1.1 Schedule
latch free 177 1.1 6.41 .7 Other
latch: enqueue hash chains 176 .7 3.92 .4 Other
log file switch (checkpoint in 37 .7 17.88 .4 Configur
log file sync 67 .4 6.65 .3 Commit
latch: shared pool 27 .2 7.72 .1 Concurre
Disk file operations I/O 45 .1 2.78 .1 User I/O
cursor: pin S 35 .1 2.30 .0 Concurre
・・・・・
------------------------------ ----------- ---------- ---------- ------ --------
DB CPU 116.2 52.1
resmgr:cpu quantum 3,051 16.7 5.46 7.5 Schedule
cursor: pin S wait on X 92 7.8 85.04 3.5 Concurre
db file sequential read 1,210 1.3 1.04 .6 User I/O
cursor: pin S 148 1.2 8.43 .6 Concurre
library cache load lock 125 1.2 9.86 .6 Concurre
・・・・・

Enqueue Activity
-> only enqueues with requests are shown
-> Enqueue stats gathered prior to 10g should not be compared with 10g data
-> ordered by Wait Time desc, Waits desc, Requests desc
------------------------------------------------------------------------------
------------ ------------ ----------- ----------- ------------ --------------
5,758 5,765 0 5,763 53 9.16
HW-Segment High Water Mark
64 64 0 2 0 5.00
TM-DML
76,240 76,240 0 0 0 N/A
83
------------------------------------------------------------------------------
------------ ------------ ----------- ----------- ------------ --------------
9,704 9,714 0 9,706 37 3.82
SQ-Sequence Cache
3 3 0 2 0 5.00

-> % of Capture shows % of row lock waits for each top segment compared
-> with total row lock waits for all segments captured by the Snapshot
-> When ** MISSING ** occurs, some of the object attributes may not be available
Tablespace
Owner Name
-------------------- ----------
Row
Subobject Obj. Lock % of
Object Name Name Type Obj# Dataobj# Waits Capture
-------------------- ---------- ----- ---------- ---------- ------------ -------
SCOTT DBTS2014
LOCK_TABLE TABLE 96743 96743 5,748 100.00
------------------------------------------------------
84

-> Top SQL statements by DB Time along with the top events by DB Time
for those SQLs.
-> % Activity is the percentage of DB Time due to the SQL.
-> % Event is the percentage of DB Time due to the event that the SQL is
waiting on.
-> % Row Source is the percentage of DB Time due to the row source for the
SQL waiting on the event.
-> Executions is the number of executions of the SQL that were sampled in ASH.
SQL ID Plan Hash Executions % Activity
----------------------- -------------------- -------------------- --------------
% Row
Event % Event Top Row Source Source
------------------------------ ------- --------------------------------- -------
btxfn6y1htqsd 2069818805 6 61.54
enq: TX - row lock contention 38.46 UPDATE 38.46
UPDATE LOCK_TABLE SET STATUS=1 WHERE ID = :B1
CPU + Wait for CPU 23.08 UPDATE STATEMENT 15.38
・・・・
85

-> s - second, ms - millisecond - 1000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Total
-------------------------- ----------- ----- -------- ---------- -------- ------
resmgr:cpu quantum 420 2 4.38 0.0 1.1
latch free 177 1 6.41 0.0 .7
latch: enqueue hash chains 176 1 3.92 0.0 .4
・・・・・
86
Total
-------------------------- ----------- ----- -------- ---------- -------- ------
resmgr:cpu quantum 3,051 17 5.46 0.0 7.5
cursor: pin S wait on X 92 8 85.04 0.0 3.5
db file sequential read 1,210 1 1.04 0.0 .6
cursor: pin S 148 1 8.43 0.0 .6

-> % of Waits: value of .0 indicates value was <.05%; value of null is truly 0
-> % of Waits: column heading of <=1s is truly <1024ms, >1s is truly >=1024ms
% of Waits
-----------------------------------------------
Total
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
・・・・・
db file sequential read 183 76.0 14.8 8.7 .5
enq: TX - row lock conten 5763 26.4 22.6 23.4 17.4 8.0 2.0 .2 .0
・・・・・
87
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
・・・・・
db file scattered read 51 9.8 31.4 27.5 15.7 15.7
db file sequential read 1463 64.0 14.3 11.3 7.2 2.9 .3
enq: TX - row lock conten 9707 25.5 22.2 23.9 18.0 8.2 2.0 .2
・・・・・

ms is milliseconds
% of Total Waits
-----------------------------------------------
Waits
64ms
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
db file async I/O submit 1 94.1 5.9
enq: TX - row lock conten 12 99.8 .2 .0 .0
latch free 1 99.5 .5
log file parallel write 4 99.9 .1
oracle thread bootstrap 3 50.0 16.7 16.7 16.7
------------------------------------------------------
88
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
cursor: pin S wait on X 48 47.8 12.0 21.7 3.3 15.2
enq: TX - row lock conten 22 99.8 .2 .0
library cache load lock 2 98.4 1.6

m is 64*1024 milliseconds (approximately 67 seconds or 1.1 minutes)
% of Total Waits
-----------------------------------------------
Waits
4s
Event to 2m <2s <4s <8s <16s <32s < 1m < 2m >=2m
------------------------- ------ ----- ----- ----- ----- ----- ----- ----- -----
enq: TX - row lock conten 1 100.0 .0
------------------------------------------------------
89
No data exists for this section of the report.
------------------------------------------------------

90
<1ms
<2ms
<4ms
<8ms
<16ms
<32ms
<64ms
<125ms
<1ms
<2ms
<4ms
<8ms
<16ms
<32ms
<64ms
<125ms
<32000ms

91
<1ms
<2ms
<4ms
<8ms
<16ms
<32ms
<64ms
<125ms
<32000ms
<1ms
<2ms
<4ms
<8ms
<16ms
<32ms
<64ms
<125ms

91
<1ms
<2ms
<4ms
<8ms
<16ms
<32ms
<64ms
<125ms
<32000ms
<1ms
<2ms
<4ms
<8ms
<16ms
<32ms
<64ms
<125ms
<32000ms

E34 : [JPOUG Presents] Oracle Database の隠されている様々な謎を解くセッション「なーんでだ？」再び @ db tech showcase 2015 Tokyo

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E34 : [JPOUG Presents] Oracle Database の隠されている様々な謎を解くセッション「なーんでだ？」再び @ db tech showcase 2015 Tokyo