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| DB transactionality in API exit |
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| yashgt |
 Posted: Mon Aug 31, 2015 9:10 pm Post subject: DB transactionality in API exit |
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Apprentice
Joined: 11 Nov 2014
Posts: 38
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Hi,
http://www-01.ibm.com/support/knowledgecenter/SSFKSJ_7.0.1/com.ibm.mq.amqzag.doc/fa20000_.htm
This links states that the exit function can operate in the application's unit of work.
Imagine the application starts a UOW:
MQPUT a message to a queue
Insert a record in table T1 of a DB
Also, we have a Put_After exit function that also inserts a record in table T2 of the same DB.
As per the above link Webesphere MQ acting as a XA Transaction Manager, will treat the insertion into T1 and T2 as a single XA transaction.
My question is, will DB2 treat the two insertions as a single transaction?
Regards,
Yash |
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| Vitor |
| Posted: Tue Sep 01, 2015 4:54 am Post subject: Re: DB transactionality in API exit |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| yashgt wrote: |
| My question is, will DB2 treat the two insertions as a single transaction? |
How have you configured DB2 to participate in the XA transaction?
Or "post the switch files" if you prefer. 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| yashgt |
| Posted: Wed Sep 02, 2015 9:35 pm Post subject: QM.ini |
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Apprentice
Joined: 11 Nov 2014
Posts: 38
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| Code: |
ExitPath:
ExitsDefaultPath=/var/mqm/exits
ExitsDefaultPath64=/var/mqm/exits64
#* *#
#* *#
Log:
LogPrimaryFiles=3
LogSecondaryFiles=2
LogFilePages=4096
LogType=CIRCULAR
LogBufferPages=0
LogPath=/var/mqm/log/TESTQM!MQM/
LogWriteIntegrity=TripleWrite
Service:
Name=AuthorizationService
EntryPoints=14
ServiceComponent:
Service=AuthorizationService
Name=MQSeries.UNIX.auth.service
Module=amqzfu
ComponentDataSize=0
XAResourceManager:
Name=TESTDB
SwitchFile=db2swit
XAOpenString=TESTDB,test,test123,toc=t,hold_cursor=t
ThreadOfControl=THREAD
ApiExitLocal:
Sequence=100
Function=EntryPoint
Module=/home/me/myApiExit/libamqsaxe
Name=SampleApiExit |
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| Vitor |
| Posted: Thu Sep 03, 2015 4:19 am Post subject: Re: DB transactionality in API exit |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Vitor wrote: |
| yashgt wrote: |
| My question is, will DB2 treat the two insertions as a single transaction? |
How have you configured DB2 to participate in the XA transaction?
Or "post the switch files" if you prefer. |
Ok, so that's the MQ configuration. What about the DB2....?
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| yashgt |
| Posted: Mon Sep 07, 2015 3:59 am Post subject: |
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Apprentice
Joined: 11 Nov 2014
Posts: 38
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Is there any specific parameter you would want to look at in the DB2 configuration?
Here is the configuration:
Database Configuration for Database mydb
Database configuration release level = 0x0f00
Database release level = 0x0f00
Database territory = US
Database code page = 819
Database code set = ISO8859-1
Database country/region code = 1
Database collating sequence = UNIQUE
Alternate collating sequence (ALT_COLLATE) =
Number compatibility = OFF
Varchar2 compatibility = OFF
Date compatibility = OFF
Database page size = 4096
Statement concentrator (STMT_CONC) = OFF
Discovery support for this database (DISCOVER_DB) = ENABLE
Restrict access = NO
Default query optimization class (DFT_QUERYOPT) = 5
Degree of parallelism (DFT_DEGREE) = 1
Continue upon arithmetic exceptions (DFT_SQLMATHWARN) = NO
Default refresh age (DFT_REFRESH_AGE) = 0
Default maintained table types for opt (DFT_MTTB_TYPES) = SYSTEM
Number of frequent values retained (NUM_FREQVALUES) = 10
Number of quantiles retained (NUM_QUANTILES) = 20
Decimal floating point rounding mode (DECFLT_ROUNDING) = ROUND_HALF_EVEN
Backup pending = NO
All committed transactions have been written to disk = NO
Rollforward pending = NO
Restore pending = NO
Multi-page file allocation enabled = YES
Log retain for recovery status = NO
User exit for logging status = NO
Self tuning memory (SELF_TUNING_MEM) = ON
Size of database shared memory (4KB) (DATABASE_MEMORY) = AUTOMATIC(126520)
Database memory threshold (DB_MEM_THRESH) = 10
Max storage for lock list (4KB) (LOCKLIST) = AUTOMATIC(11872)
Percent. of lock lists per application (MAXLOCKS) = AUTOMATIC(97)
Package cache size (4KB) (PCKCACHESZ) = AUTOMATIC(31821)
Sort heap thres for shared sorts (4KB) (SHEAPTHRES_SHR) = AUTOMATIC(1419)
Sort list heap (4KB) (SORTHEAP) = AUTOMATIC(283)
Database heap (4KB) (DBHEAP) = AUTOMATIC(2321)
Catalog cache size (4KB) (CATALOGCACHE_SZ) = 157
Log buffer size (4KB) (LOGBUFSZ) = 1130
Utilities heap size (4KB) (UTIL_HEAP_SZ) = 5000
Buffer pool size (pages) (BUFFPAGE) = 1000
SQL statement heap (4KB) (STMTHEAP) = AUTOMATIC(8192)
Default application heap (4KB) (APPLHEAPSZ) = AUTOMATIC(256)
Application Memory Size (4KB) (APPL_MEMORY) = AUTOMATIC(40000)
Statistics heap size (4KB) (STAT_HEAP_SZ) = AUTOMATIC(4384)
Interval for checking deadlock (ms) (DLCHKTIME) = 10000
Lock timeout (sec) (LOCKTIMEOUT) = -1
Changed pages threshold (CHNGPGS_THRESH) = 80
Number of asynchronous page cleaners (NUM_IOCLEANERS) = AUTOMATIC(2)
Number of I/O servers (NUM_IOSERVERS) = AUTOMATIC(3)
Index sort flag (INDEXSORT) = YES
Sequential detect flag (SEQDETECT) = YES
Default prefetch size (pages) (DFT_PREFETCH_SZ) = AUTOMATIC
Track modified pages (TRACKMOD) = NO
Default number of containers = 1
Default tablespace extentsize (pages) (DFT_EXTENT_SZ) = 32
Max number of active applications (MAXAPPLS) = AUTOMATIC(40)
Average number of active applications (AVG_APPLS) = AUTOMATIC(1)
Max DB files open per application (MAXFILOP) = 61440
Log file size (4KB) (LOGFILSIZ) = 1024
Number of primary log files (LOGPRIMARY) = 13
Number of secondary log files (LOGSECOND) = 12
Changed path to log files (NEWLOGPATH) =
Path to log files = /home/devcit/devcit/NODE0000/SQL00025/LOGSTREAM0000/
Overflow log path (OVERFLOWLOGPATH) =
Mirror log path (MIRRORLOGPATH) =
First active log file =
Block log on disk full (BLK_LOG_DSK_FUL) = NO
Block non logged operations (BLOCKNONLOGGED) = NO
Percent max primary log space by transaction (MAX_LOG) = 0
Num. of active log files for 1 active UOW(NUM_LOG_SPAN) = 0
Percent log file reclaimed before soft chckpt (SOFTMAX) = 520
HADR database role = STANDARD
HADR local host name (HADR_LOCAL_HOST) =
HADR local service name (HADR_LOCAL_SVC) =
HADR remote host name (HADR_REMOTE_HOST) =
HADR remote service name (HADR_REMOTE_SVC) =
HADR instance name of remote server (HADR_REMOTE_INST) =
HADR timeout value (HADR_TIMEOUT) = 120
HADR target list (HADR_TARGET_LIST) =
HADR log write synchronization mode (HADR_SYNCMODE) = NEARSYNC
HADR spool log data limit (4KB) (HADR_SPOOL_LIMIT) = 0
HADR log replay delay (seconds) (HADR_REPLAY_DELAY) = 0
HADR peer window duration (seconds) (HADR_PEER_WINDOW) = 0
First log archive method (LOGARCHMETH1) = OFF
Archive compression for logarchmeth1 (LOGARCHCOMPR1) = OFF
Options for logarchmeth1 (LOGARCHOPT1) =
Second log archive method (LOGARCHMETH2) = OFF
Archive compression for logarchmeth2 (LOGARCHCOMPR2) = OFF
Options for logarchmeth2 (LOGARCHOPT2) =
Failover log archive path (FAILARCHPATH) =
Number of log archive retries on error (NUMARCHRETRY) = 5
Log archive retry Delay (secs) (ARCHRETRYDELAY) = 20
Vendor options (VENDOROPT) =
Auto restart enabled (AUTORESTART) = ON
Index re-creation time and redo index build (INDEXREC) = SYSTEM (RESTART)
Log pages during index build (LOGINDEXBUILD) = OFF
Default number of loadrec sessions (DFT_LOADREC_SES) = 1
Number of database backups to retain (NUM_DB_BACKUPS) = 12
Recovery history retention (days) (REC_HIS_RETENTN) = 366
Auto deletion of recovery objects (AUTO_DEL_REC_OBJ) = OFF
TSM management class (TSM_MGMTCLASS) =
TSM node name (TSM_NODENAME) =
TSM owner (TSM_OWNER) =
TSM password (TSM_PASSWORD) =
Automatic maintenance (AUTO_MAINT) = ON
Automatic database backup (AUTO_DB_BACKUP) = OFF
Automatic table maintenance (AUTO_TBL_MAINT) = ON
Automatic runstats (AUTO_RUNSTATS) = ON
Real-time statistics (AUTO_STMT_STATS) = ON
Statistical views (AUTO_STATS_VIEWS) = OFF
Automatic sampling (AUTO_SAMPLING) = OFF
Automatic statistics profiling (AUTO_STATS_PROF) = OFF
Statistics profile updates (AUTO_PROF_UPD) = OFF
Automatic reorganization (AUTO_REORG) = OFF
Auto-Revalidation (AUTO_REVAL) = DEFERRED
Currently Committed (CUR_COMMIT) = ON
CHAR output with DECIMAL input (DEC_TO_CHAR_FMT) = NEW
Enable XML Character operations (ENABLE_XMLCHAR) = YES
WLM Collection Interval (minutes) (WLM_COLLECT_INT) = 0
Monitor Collect Settings
Request metrics (MON_REQ_METRICS) = BASE
Activity metrics (MON_ACT_METRICS) = BASE
Object metrics (MON_OBJ_METRICS) = EXTENDED
Routine data (MON_RTN_DATA) = NONE
Routine executable list (MON_RTN_EXECLIST) = OFF
Unit of work events (MON_UOW_DATA) = BASE
UOW events with package list (MON_UOW_PKGLIST) = OFF
UOW events with executable list (MON_UOW_EXECLIST) = OFF
Lock timeout events (MON_LOCKTIMEOUT) = NONE
Deadlock events (MON_DEADLOCK) = WITHOUT_HIST
Lock wait events (MON_LOCKWAIT) = NONE
Lock wait event threshold (MON_LW_THRESH) = 5000000
Number of package list entries (MON_PKGLIST_SZ) = 32
Lock event notification level (MON_LCK_MSG_LVL) = 1
SMTP Server (SMTP_SERVER) =
SQL conditional compilation flags (SQL_CCFLAGS) =
Section actuals setting (SECTION_ACTUALS) = NONE
Connect procedure (CONNECT_PROC) =
Adjust temporal SYSTEM_TIME period (SYSTIME_PERIOD_ADJ) = NO
Log DDL Statements (LOG_DDL_STMTS) = NO
Log Application Information (LOG_APPL_INFO) = NO
Default data capture on new Schemas (DFT_SCHEMAS_DCC) = NO
Database is in write suspend state = NO |
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