1. SQL*Net
Kyle Hailey
http://oraclemonitor.com
http//ashmasters.com/
Kyle.hailey@embarcadero.com
#.1

2. Network
Redo Lib Buffer
Cache Cache
Locks
Network
IO
Copyright 2006 Kyle Hailey #.2

3. SQL*Net Waits
SQL*Plus Host Machine
OCI
SGA
SQL*Forms Log Library Buffer
Buffer Cache Cache
Buffer Cache
Java Application
Log Buffer
etc
Client
Network
Session
Shadow
Copyright 2006 Kyle Hailey
#.3

4. SQL*Net Waits P1 and P2
Idle (or not?)
 SQL*Net message from client
Packing and Network:
 SQL*Net message to client
For Network
 SQL*Net more data to client Timings Use
 SQL*Net more data from client
Error
Ping
 SQL*Net break/reset to client
Tnsping
Dblink equivalents
 SQL*Net message to dblink Network sniffers
 SQL*Net more data to dblink
 SQL*Net more data from dblink
 SQL*Net break/reset to dblink
Copyright 2006 Kyle Hailey #.4

5. SQL*Net message from client
 Idle Event
 Waiting for work from Client
 Includes network transmission times for messages
coming from shadow
 Indicative of Client “think time” or “processing time”
“idle” or
Client “working” or “idle” waiting for work
“waiting”
waiting from client
???
Session
Shadow
orasrp.ru
#.5

6. SQL*Net message to client
 Time it takes to pack a message to be sent to
the client
 Doesn’t include network timing
http://blog.tanelpoder.com/2008/02/10/sqlnet-message-to-client-vs-sqlnet-more-data-to-client
Client Waiting
Waiting for
Message
Packing
Session
Shadow
#.6

7. SQL*Net more data to client
 Client sends information that spans SDU
packets
 Time it takes to pack
 Might include network timing - unclear
Waiting for
Client Waiting
Message
Packing
Session
Shadow
Copyright 2006 Kyle Hailey #.7

8. SQL*Net more data from client
 Client is sending data to shadow that spans
packets
 Shadow waits for next packet
 Could indicate
 network latency?
 Problem with the client tool
Client Working Waiting
Session
Shadow
Copyright 2006 Kyle Hailey
#.8

9. SQL*Net more data from client
“OEM-lite”
Written in TCL/TK
Only
Overview
SQL Text
Application Server Crashed
#.9
Copyright 2006

10. SQL*Net more data from dblink
 Shadow at db link is sending data to client that
spans packets
 Sends first packet then waits for shadow to
respond, so it can send more
“Client”
Session dblink
Shadow Shadow
Copyright 2006 Kyle Hailey #.10

11. SDU: More Data
 SDU : Session Data Unit
Message size
TDU – Transmission Data
Set in sqlnet.ora Unit – see note 44694.1
The TDU parameter has
trace_level_client=16
been deprecated in the
trace_directory_client=/tmp
Oracle Net v8.0 and
trace_file_client=client.trc
beyond and is ignored. It
trace_unique_client = true
is only mentioned here for
trace_level_server=16 backward compatibility.
trace_directory_server=/tmp
trace_file_server=server.trc
client_187.trc:[12-JAN-2008 11:01:38:209] nsconneg: vsn=313,
gbl=0xa01, sdu=2048, tdu=32767
Copyright 2006 Kyle Hailey #.11

12. SDU 32K
V10G = (DESCRIPTION = tnsnames.ora
(SDU=32768)
(ADDRESS = (PROTOCOL = TCP)(HOST = fuji)(PORT =
1522))
(CONNECT_DATA =
(SERVER = DEDICATED) (SERVICE_NAME = v10g)
))
SID_LIST_LISTENER = listener.ora
(SID_LIST =
(SID_DESC =
(SDU=32768)
(SID_NAME = v10g)
(ORACLE_HOME = /export/home/oracle10)
))
client_3582.trc:[12-JAN-2008 11:37:39:237] nsconneg: vsn=313,
gbl=0xa01, sdu=32768, tdu=32767
Copyright 2006 Kyle Hailey #.12

13. SQL*Net break/reset to client
 Error in sql statement
 Control C
 Usually highlights and error in application
Client
Waiting Error
Session
Shadow
Copyright 2006 Kyle Hailey
#.13

14. Example
CREATE TABLE T1 (C1 NUMBER);
ALTER TABLE T1 ADD
(CONSTRAINT T1_CHECK1 CHECK (C1 IN ('J','N')));
ALTER SESSION SET EVENTS
'10046 TRACE NAME CONTEXT FOREVER, LEVEL 12';
INSERT INTO T1 VALUES (1);
PARSING IN CURSOR #2 len=25 dep=0 uid=0 oct=2 lid=0 tim=5009300581224 hv=9816834
09 ad='8e6a7c10'
INSERT INTO T1 VALUES (1)
END OF STMT
PARSE #2:c=0,e=2770,p=0,cr=2,cu=0,mis=1,r=0,dep=0,og=1,tim=5009300581220
BINDS #2:
EXEC #2:c=0,e=128,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=5009300581418
ERROR #2:err=1722 tim=512952379
WAIT #2: nam='SQL*Net break/reset to client' ela= 31 driver id=1650815232 break?
=1 p3=0 obj#=-1 tim=5009300581549
WAIT #2: nam='SQL*Net break/reset to client' ela= 92 driver id=1650815232 break?
=0 p3=0 obj#=-1 tim=5009300581662
Copyright 2006 Kyle Hailey #.14

15. SQL*Net break/reset to dblink
 Error in sql statement
 Control C
 Usually highlights and error in application
Waiting error
Session dblink
Shadow Shadow
Copyright 2006 Kyle Hailey #.15

16. Summary
 Network/Client/Tool issues
 More data from client
 More data from dblink
 Try SDU , RECV_BUF_SIZE and SEND_BUF_SIZE
 SQL*Net more data from client
 SQL*Net more data to client
 SQL*Net more data from dblink For Network Timings Use
 Application Error Ping
 SQL*Net break/reset to client
 SQL*Net break/reset to dblink Tnsping
Network sniffers
Copyright 2006 Kyle Hailey #.16