1. SQL*Net & Other Waits

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

3. #.3 Copyright 2006 Kyle Hailey SQL*Net 6 SQL*Net more data from client Usually OK, reduce data transferred, possible Network problems 10 SQL*Net more data to client Usually OK, reduce amount of data transferred, possible Network tuning needed 14 SQL*Net break/reset to client Check for errors in sql statement 21 SQL*Net more data from dblink Reduce data transfer, check net response 31 SQL*Net break/reset to dblink Check for errors in sql statement sent

4. #.4 Copyright 2006 Kyle Hailey SQL*Net Waits Session Shadow Log Buffer Buffer Cache Log Buffer Buffer Cache SGA Library Cache Host Machine SQL*PlusOCISQL*Formsetc

5. #.5 Copyright 2006 Kyle Hailey SQL*Net Waits P1 and P2 1.SQL*Net message to client 2.SQL*Net more data from client 3.SQL*Net more data to client 4.SQL*Net more data from dblink  Message and More data  P1 = driver id  P2 = #bytes 5.SQL*Net break/reset to client 6.SQL*Net break/reset to dblink  Break/resets  P1= driver id  P2 = break

6. #.6 Copyright 2006 Kyle Hailey 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 Waiting http://blog.tanelpoder.com/2008/02/10/sqlnet-message-to-client-vs-sqlnet-more-data-to-client

7. #.7 Copyright 2006 Kyle Hailey 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 Waiting

8. #.8 Copyright 2006 Kyle Hailey 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 Waiting

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

10. #.10 Copyright 2006 Kyle Hailey 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 Waiting dblink Shadow

11. #.11 Copyright 2006 Kyle Hailey 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_directory_client=/tmptrace_file_client=client.trc trace_unique_client = true trace_level_server=16trace_directory_server=/tmptrace_file_server=server.trc TDU – Transmission Data Unit – see note 44694.1 The TDU parameter has been deprecated in the Oracle Net v8.0 and beyond and is ignored. It is only mentioned here for backward compatibility.

12. #.12 Copyright 2006 Kyle Hailey SDU 32K V10G = (DESCRIPTION = (SDU=32640) (SDU=32640) (ADDRESS = (PROTOCOL = TCP)(HOST = fuji)(PORT = 1522)) (ADDRESS = (PROTOCOL = TCP)(HOST = fuji)(PORT = 1522)) (CONNECT_DATA = (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = v10g) (SERVER = DEDICATED) (SERVICE_NAME = v10g) ) ) ) ) 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.ora tnsnames.ora client_3582.trc:[12-JAN-2008 11:37:39:237] nsconneg: vsn=313, gbl=0xa01, sdu=32640, tdu=32767

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

14. #.14 Copyright 2006 Kyle Hailey Example 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 CREATE TABLE T1 (C1 NUMBER); ALTER TABLE T1 ADD (CONSTRAINT T1_CHECK1 CHECK (C1 IN ('J','N'))); (CONSTRAINT T1_CHECK1 CHECK (C1 IN ('J','N'))); ALTER SESSION SET EVENTS '10046 TRACE NAME CONTEXT FOREVER, LEVEL 12'; '10046 TRACE NAME CONTEXT FOREVER, LEVEL 12'; INSERT INTO T1 VALUES (1);

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

16. #.16 Copyright 2006 Kyle Hailey 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