Statspack https://community.oracle.com/people/royalwzy/blog/2016/02/01/performance-tuning-tool01-statspack

1. Statspack
1.
1. Statspack;
2. Statspack ;
3. Statspack ;
4. Statspack ;
2. Statspack :
1. 8i ;
2. Statspack AWR , , AWR;
3. Statspack is a set of scripts that capture and report on performance data from within
the Oracle database;
4. Statspack :
1. Capture instance data by taking a "snapshot";
2. Store snapshot data in the database in a separate schema;
3. Create reports between two snapshots;
4. Mark snapshots as baseline information;
5. Use the reports as part of a performance tuning method;
5. Statspack :
1. spcreate.sql: Statspack;
2. statspack.snap: ;
3. spauto.sql: , alter system set job_queue_processes = 5 ;
4. spreport.sql/sprepsql.sql: ;
5. statspack.purge/sppurge.sql: ;
6. sptrunc.sql: Statspack ;
7. spdrop.sql: Statspack ;
8. spexp.par: Statspack ;
3. Statspack:
1. , statspack :CREATE TABLESPACE statspack DATAFILE '+DATA' SIZE
500M AUTOEXTEND ON EXTENT MANAGEMENT LOCAL;
2. sysdba :sqlplus / as sysdba;
3. PERFSTAT :define perfstat_password='oracle';
4. PERFSTAT :define default_tablespace='statspack';
5. PERFSTAT :define temporary_tablespace='temp';
6. Statspack:@?/rdbms/admin/spcreate.sql;
7. :host ls *.lis; spdrop.sql ,
;
8. PERFSTAT ,Statspack ;( ,
)
4. Statspack :
1. :execute statspack.snap;
2. :
3. , :
5. :
1. :
1. 0:General Performance;
2. 5:SQL statments;
3. 6:SQL plans and SQL plan usage;
4. 7:Segment-level statistics, v$segment_statistics ,
:SELECT owner, object_name FROM v$segment_statistics WHERE statistic_name =
'buffer busy waits' ORDER BY VALUE DESC;
5. 10:Parent and child latches, ;
2. :SELECT snap_level FROM perfstat.stats$statspack_parameter;
3. :execute statspack.snap(i_snap_level=>6);
4. , :execute statspack.snap(i_snap_level=>10,
i_modify_parameter=>'true');
5. / ( ):execute
statspack.modify_statspack_parameter(i_snap_level=>7);
6. session , session_id=3 :execute
statspack.snap(i_session_id=>3);
6. / Statspack Baselines :
1. ( ,
i_snap_range=false, ture):exec statspack.make_baseline(i_begin_snap=>2,
i_end_snap=>5, i_snap_range=>true);
2. :exec statspack.make_baseline(i_begin_date=>to_date('2012-
05-01 12:00:00', 'YYYY-MM-DD HH24:MI:SS'), i_begin_date=>to_date('2012-05-02
12:00:00', 'YYYY-MM-DD HH24:MI:SS'));
3. , ( , ,
i_snap_range=false):statspack.clear_baseline(i_begin_snap=>2, i_end_snap=>5,
i_snap_range=>true);
4. :exec statspack.clear_baseline(i_begin_date=>to_date('2012-05-
01 12:00:00', 'YYYY-MM-DD HH24:MI:SS'), i_begin_date=>to_date('2012-05-02 12:00:00',
'YYYY-MM-DD HH24:MI:SS'));
5. exec statspack.purge(); ;
6. baseline , purge baseline baseline snap,
clear baseline;
7. Statspack :
1. perfstat :conn perfstat/oracle;
2. , :
1. :define begin_snap=1;
2. :define end_snap=4;
3. :define report_name=spreport;
3. :@?/rdbms/admin/spreport.sql;
4. :host ls spreport.lst;
8. Statspack :
1. STATISICS_LEVEL=TYPICAL;
2. TIMED_STATISTICS=TRUE ;
3. Statspack AWR , AWR;
4. , 1 , , ###### ;
5. PREFSTAT ;
9. Statspack :
1. :
1. Load Profile(useful with baseline);
2. Instance Efficiency(useful with baseline);
3. Top 5 Timed Events;
4. Time Model;
5. Wait Events and Background Wait Events;
6. Wait Event Histogram(only in Statspack);
2. ,:
1. CONT:Block contention;
2. CPU:CPU consumption;
1. Host CPU;
2. Instance CPU;
3. SQL ordered by CPU;
4. SQL ordered by Gets;
3. LC:Library cache;
1. Shared Pool Statistics;
2. SQL ordered by Parse Calls;
4. MEM:Memory consumption;
1. Virtual Memory Paging;
5. ENQ:Enqueue;
6. IO:I/O consumption;
1. SQL ordered by Elapsed;
2. SQL ordered by Reads;
7. LAT:Latch contention;
8. PGAM:PGA memory consumption;
9. RBS:Rollback segment;
10. UNDO:Automatic undo;
11. SP:Shared pool;
------------------- Statspack -------------------
-- 1. , ;
1. ORCL, 10.2.0.1.0;
2. , 1.67 ;
-- 2. , , , baseline ;
1.Redo size: ( ), ;
2.Logical reads: ( block);
3.block changes: block , , 1:4(13.51:57.68),
OLTP ;
4.Physical reads: block , Logica reads , Physical Reads
, Buffer Cache , ;
5.Physical writes: block , , ;
6.User calls: ;
7.Parses: sql ( ), CPU ; 100 /s ,
300 /s ;
8.Hard parses: , (1 - hard prases/parses)*100%, 95% ,
session_cached_cursors ;
9.Sorts: , ;
10.Logons: , , session ;
11.Executes: , , baseline ;
12.Transactions: , ;
13.Blocks changed per Read: 23.42%;
14.Recursive Call: PL/SQL , ; ;
15.Rollback per transaction: , undo , ,
;
-- 3. , , 100%;
1.Buffer Nowait: 99%, ;
2.Buffer Hit: 99%, , , IO ;
3.Library Hit: 95%, sql ( ,
);
4.Soft Parse: 95%, 80% sql , Load Profile ;
5.Latch Hit: 95% ;
6.Execute to Parse: SQL , SQL , ,
session , 0. , session , SQL SQL
;
7.Parse CPU to Parse Elapsd: CPU 100/102.56 ; 100%, CPU
SQL , ; 100%, CPU , ;
8.Non-Parse CPU , round(100*(1-
parse_cpu/tot_cpu),2). parse_cpu , tot_cpu , 100%, ,
, ;
9.Memory Usage: , 75% 90%; , ;
, , SQL ;
10.Sql with executions > 1: 1 SQL ,
;
11.Memory for SQL w/exec>1: SQL , SQL ,
1 SQL , ;
-- 4. 5 , ;
1. CPU time , DB CPU;
2.DB file scatter read: , ;
, , , (
);
3.DB file sequential read: ( , ); ,
;DB_CACHE_SIZE , ;
PGA , , ; ;
4.Buffer busy wait: , , ; 1 ,
;
5.Latch free: , (SGA) , ;
6.Enqueue: , ; , ,
, , ;
7.Logfile Switch: ( ) ;
8.Log buffer space: , ;
9.Log file sync: session ,session , LGWR redo
entry redo log file, redo log file , session, 10.LGRW ; :
, ;
11.Ldle event: ;
-- 5.CPU ( );
1. CPU 88.78%, 4.07%, 5.44;
2. CPU 5.44%*4.98%, CPU 5.44%*4.98%*44.41%;
-- 6. , v$sys_time_model ;
-- 7. / ;
1. :s- ;cs-1/100s;ms-1/1000s;us-1/1000000s;
2. SQL*Net , , ,
;
-- 8: sql ;
1. sql , , SQL , ;
2. SQL SQL , SQL :
1. SQL , SQL , schema user1 select * from
t; schema user2 select * from t; SQL , schema , ;
2. , ;
3. , SQL 10, SQL
50, SQL ;
4. SQL ;
-- 9. , PGA ;
1. , pga_aggregate_target=96 100% ;
2. V$PGA_TARGET_ADVICE ;
-- 10. , , ;
------------------- Statspack -------------------