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2841459 - DB6: Snapshot backup during HWM reduction may cause DB to hang

Symptom

Database may hang with "Set Write Resume failed" after starting a snapshot backup during HWM reduction (ex, ALTER TABLESPACE REDUCE)
The following information can be found in the db2diag.log.

2019-09-04-17.05.58.237560+000 I495615E506 LEVEL: Info
PID : 12345 TID : 139723859289856 PROC : db2sysc 0
INSTANCE: db2abc NODE : 000 DB : ABC
APPHDL : 0-53270 APPID: *LOCAL.db2abc.190904170558
AUTHID : DB2ABC HOSTNAME: abc
EDUID : 23197 EDUNAME: db2agent (ABC) 0
FUNCTION: DB2 UDB, base sys utilities, sqleSetWriteSuspend, probe:4570
DATA #1 : <preformatted>
Set Write Suspend issued from member 0

2019-09-04-17.08.04.615262+000 I496122E504 LEVEL: Info
PID : 12345 TID : 139745166354176 PROC : db2sysc 0
INSTANCE: db2abc NODE : 000 DB : ABC
APPHDL : 0-41715 APPID: *LOCAL.db2abc.190904170804
AUTHID : DB2ABC HOSTNAME: abc
EDUID : 24428 EDUNAME: db2agent (ABC) 0
FUNCTION: DB2 UDB, base sys utilities, sqleSetWriteResume, probe:5579
DATA #1 : <preformatted>
Set Write Resume issued from member 0

2019-09-04-17.08.07.623233+000 I496627E1125 LEVEL: Severe
PID : 12345 TID : 139745166354176 PROC : db2sysc 0
INSTANCE: db2abc NODE : 000 DB : ABC
APPHDL : 0-41715 APPID: *LOCAL.db2abc.190904170804
AUTHID : DB2ABC HOSTNAME: abc
EDUID : 24428 EDUNAME: db2agent (ABC) 0
FUNCTION: DB2 UDB, base sys utilities, sqleSetWriteResume, probe:5634
MESSAGE : ZRC=0x870F0035=-2029060043=SQLO_NOTAVAIL
"Cannot honor the conditional request"
DIA8531C A memory access error has occurred.
DATA #1 : String, 14 bytes
Error Occurred
DATA #2 : SQLP_LOCK_INFO, PD_TYPE_SQLP_LOCK_INFO, 144 bytes
lockname 00000000000000000000000000 SQLP_NOLOCK (0x0) (No lock specifics available)
pLRB (nil) prevIntent NON curIntent NON intent NON duration 0
rlInFlags 0x00000000 rlOutFlags 0x00000000 rlTimeout 0x00000000 cursorBitmap 0x00000000 rrIIDin 0 rrIIDout 0 priority 0 pEHLState 0000000000000000
rlUserData.UNKNOWN 0000 0000 0000 0000 ........

2019-09-04-17.08.07.645450+000 E497753E556 LEVEL: Warning
PID : 12345 TID : 139745166354176 PROC : db2sysc 0
INSTANCE: db2abc NODE : 000 DB : ABC
APPHDL : 0-41715 APPID: *LOCAL.db2abc.190904170804
AUTHID : DB2ABC HOSTNAME: abc
EDUID : 24428 EDUNAME: db2agent (ABC) 0
FUNCTION: DB2 UDB, base sys utilities, sqleSetWriteResume, probe:5634
MESSAGE : ADM6005N The SET WRITE RESUME command failed for the database.
Database name: "ABC ".

2019-09-04-17.08.07.652358+000 I498310E597 LEVEL: Error
PID : 12345 TID : 139745166354176 PROC : db2sysc 0
INSTANCE: db2abc NODE : 000 DB : ABC
APPHDL : 0-41715 APPID: *LOCAL.db2abc.190904170804
AUTHID : DB2ABC HOSTNAME: abc
EDUID : 24428 EDUNAME: db2agent (ABC) 0
FUNCTION: DB2 UDB, relation data serv, sqlrrRdsSetupPost, probe:6328
CALLED : DB2 UDB, relation data serv, sqlrr_rds_common_post
RETCODE : ZRC=0x8005047C=-2147154820=SQLE_RC_RESUME_FAILED
"Set Write Resume failed"

2019-09-04-17.08.40.637791+000 E498908E846 LEVEL: Warning
PID : 12345 TID : 139723473413888 PROC : db2sysc 0
INSTANCE: db2abc NODE : 000 DB :
APPHDL : 0-52899 APPID: *LOCAL.db2p5a.190904170843
AUTHID : DB2ABC HOSTNAME: abc
EDUID : 18422 EDUNAME: db2agent (instance) 0
FUNCTION: DB2 UDB, database monitor, sqm___sqlmonssagnt, probe:14
DATA #1 : <preformatted>

This occurs when any snapshot other than list applications is attempted
on a database that is write suspended. This is necessary due to latching
conflicts. This database is skipped in the snapshot, but other databases
should still be processed. Skipping database 'ABC'.
For more information on write suspend, please see the
'db2 set write suspend for database' command.


Read more...

Environment

DB2 for Linux, UNIX and Windows 10.5

Keywords

snapshot backup, hang, alter tablespace reduce, HWM, Set Write Suspend, Set Write Resume , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , Problem

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