SQL*Net & Other Waits. #.2 Copyright 2006 Kyle Hailey Network Redo Lib Cache Buffer Cache IO Locks...

SQL*Net & Other Waits

#.2

Copyright 2006 Kyle Hailey

Network

RedoRedo Lib Lib CacheCache

Buffer Buffer CacheCache

IOIO

LocksLocks

NetworkNetwork

#.3


SQL*Net

6 SQL*Net more data from clientUsually OK, reduce data transferred, possible Network problems

10 SQL*Net more data to clientUsually OK, reduce amount of data transferred, possible Network

tuning needed

14 SQL*Net break/reset to clientCheck for errors in sql statement

21 SQL*Net more data from dblinkReduce data transfer, check net response

31 SQL*Net break/reset to dblinkCheck for errors in sql statement sent

#.4


SQL*Net Waits

Session

Shadow

Log BufferLog Buffer

Buffer CacheBuffer CacheLog Log BufferBuffer

Buffer Buffer CacheCache

SGASGALibrary Library CacheCache

Host MachineHost Machine

SQL*PlusSQL*Plus

OCIOCI

SQL*FormsSQL*Forms

etcetc

#.5


SQL*Net Waits P1 and P2

1. SQL*Net message to client2. SQL*Net more data from client3. SQL*Net more data to client4. SQL*Net more data from dblink

Message and More data P1 = driver id P2 = #bytes

5. SQL*Net break/reset to client6. SQL*Net break/reset to dblink

Break/resets P1= driver id P2 = break

#.6


SQL*Net message to client Time it takes to pack a message to be sent to

the client Doesn’t include network timing

Session

Shadow

WaitingWaiting

http://blog.tanelpoder.com/2008/02/10/sqlnet-message-to-client-vs-sqlnet-more-data-to-clienthttp://blog.tanelpoder.com/2008/02/10/sqlnet-message-to-client-vs-sqlnet-more-data-to-client

#.7


SQL*Net more data to client Client sends information that spans SDU

packets Time it takes to pack Doesn’t include network timing

Session

Shadow

WaitingWaiting

#.8


SQL*Net more data from client Shadow is sending data to client that spans

packets Shadow waits for next packet Could indicate

network latency? Problem with the client tool

Session

Shadow

WaitingWaiting

#.9


SQL*Net more data from client

“OEM-lite”Written in TCL/TKOnly

OverviewSQL Text

Application Server CrashedApplication Server Crashed

#.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

Session

Shadow

WaitingWaitingdblink

Shadow

#.11


SDU: More Data SDU : Session Data Unit Set in sqlnet.ora

client_187.trc:[12-JAN-2008 11:01:38:209] nsconneg: vsn=313, gbl=0xa01, sdu=2048, tdu=32767

trace_level_client=16trace_level_client=16trace_directory_client=/tmptrace_directory_client=/tmptrace_file_client=client.trctrace_file_client=client.trctrace_unique_client = truetrace_unique_client = truetrace_level_server=16trace_level_server=16trace_directory_server=/tmptrace_directory_server=/tmptrace_file_server=server.trctrace_file_server=server.trc

TDU – Transmission Data TDU – Transmission Data Unit – see note Unit – see note 44694.1 44694.1 The TDU parameter has The TDU parameter has been deprecated in the been deprecated in the Oracle Net v8.0 and Oracle Net v8.0 and beyond and is ignored. It beyond and is ignored. It is only mentioned here for is only mentioned here for backward compatibility.backward compatibility.

#.12


SDU 32KV10G = (DESCRIPTION =V10G = (DESCRIPTION =

(SDU=32640)(SDU=32640) (ADDRESS = (PROTOCOL = TCP)(HOST = fuji)(PORT = (ADDRESS = (PROTOCOL = TCP)(HOST = fuji)(PORT = 1522))1522)) (CONNECT_DATA =(CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = v10g)(SERVER = DEDICATED) (SERVICE_NAME = v10g) ) )) )

SID_LIST_LISTENER =SID_LIST_LISTENER = (SID_LIST =(SID_LIST = (SID_DESC =(SID_DESC = (SDU=32640)(SDU=32640) (SID_NAME = v10g)(SID_NAME = v10g) (ORACLE_HOME = /export/home/oracle10)(ORACLE_HOME = /export/home/oracle10) ))))

listener.oralistener.ora

tnsnames.oratnsnames.ora

client_3582.trc:[12-JAN-2008 11:37:39:237] nsconneg: vsn=313, client_3582.trc:[12-JAN-2008 11:37:39:237] nsconneg: vsn=313,

gbl=0xa01, gbl=0xa01, sdu=32640sdu=32640, tdu=32767, tdu=32767

#.13


SQL*Net break/reset to client

Error in sql statement Control C Usually highlights and error in application

Session

Shadow

WaitingWaiting ErrorError

#.14


Example

PARSING IN CURSOR #2 len=25 dep=0 uid=0 oct=2 lid=0 tim=5009300581224 hv=9816834PARSING IN CURSOR #2 len=25 dep=0 uid=0 oct=2 lid=0 tim=5009300581224 hv=9816834

09 ad='8e6a7c10'09 ad='8e6a7c10'INSERT INTO T1 VALUES (1)INSERT INTO T1 VALUES (1)END OF STMTEND OF STMTPARSE #2:c=0,e=2770,p=0,cr=2,cu=0,mis=1,r=0,dep=0,og=1,tim=5009300581220PARSE #2:c=0,e=2770,p=0,cr=2,cu=0,mis=1,r=0,dep=0,og=1,tim=5009300581220BINDS #2:BINDS #2:EXEC #2:c=0,e=128,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=5009300581418EXEC #2:c=0,e=128,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=5009300581418ERROR #2:err=1722 tim=512952379ERROR #2:err=1722 tim=512952379WAIT #2: nam='SQL*Net break/reset to client' ela= 31 driver id=1650815232 break?WAIT #2: nam='SQL*Net break/reset to client' ela= 31 driver id=1650815232 break?=1 p3=0 obj#=-1 tim=5009300581549=1 p3=0 obj#=-1 tim=5009300581549WAIT #2: nam='SQL*Net break/reset to client' ela= 92 driver id=1650815232 break?WAIT #2: nam='SQL*Net break/reset to client' ela= 92 driver id=1650815232 break?=0 p3=0 obj#=-1 tim=5009300581662=0 p3=0 obj#=-1 tim=5009300581662

CREATE TABLE T1 (C1 NUMBER);CREATE TABLE T1 (C1 NUMBER);ALTER TABLE T1 ADD ALTER TABLE T1 ADD (CONSTRAINT T1_CHECK1 CHECK (C1 IN ('J','N')));(CONSTRAINT T1_CHECK1 CHECK (C1 IN ('J','N')));ALTER SESSION SET EVENTSALTER SESSION SET EVENTS '10046 TRACE NAME CONTEXT FOREVER, LEVEL 12';'10046 TRACE NAME CONTEXT FOREVER, LEVEL 12';INSERT INTO T1 VALUES (1);INSERT INTO T1 VALUES (1);

#.15


SQL*Net break/reset to dblink Error in sql statement Control C Usually highlights and error in application

Session

Shadow

WaitingWaitingdblink

Shadow

errorerror

#.16


SQL*Net Waits P1 and P2

Network/Client/Tool issues More data from client More data from dblink

Try SDU SQL*Net more data from client SQL*Net more data to client SQL*Net more data from dblink

Application Error SQL*Net break/reset to client SQL*Net break/reset to dblink

SQL*Net & Other Waits. #.2 Copyright 2006 Kyle Hailey Network Redo Lib Cache Buffer Cache IO Locks...

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Transcript of SQL*Net & Other Waits. #.2 Copyright 2006 Kyle Hailey Network Redo Lib Cache Buffer Cache IO Locks...