DB2日志被hold导致日志空间满模拟(转载)
在窗口1，设置非自动提交db2set db2options=+c
在窗口1，执行一条insert，但是不提交
$ db2+c "insert into t1 values('leo1','leo2')"
DB20000IThe SQL command completed successfully.
$ db2 "select * from t1"
NAME1 NAME2
---------- ----------
leo1 leo2
leo1 leo2
2 record(s) selected
在窗口2是看不到这条的，因为没有提交
$ db2 "select * from t1"
NAME1 NAME2
---------- ----------
leo1 leo2
1 record(s) selected.
在窗口2，编写脚本，并执行，脚本内容如下：
db2 connect to sample >> /dev/null
i=1
while [ $i -lt 10000 ]
do
db2 "insert into t1 values('3','3')" >> /dev/null
db2 commit >> /dev/null
i=$i+1
done
在窗口1，查询插入条数，发现一段时间后，数据不增长了
$ db2 "select count(*) from t1"
1
-----------
778
在窗口1，查看db2diag，其中报错如下：
2013-07-15-15.29.01.020342+120 I8184848A550 LEVEL: Error
PID : 19857580 TID: 9983 PROC : db2sysc 0
INSTANCE: db2test NODE : 000 DB : SAMPLE
APPHDL: 0-10490 APPID: *LOCAL.db2test.130715132615
AUTHID: DB2TEST
EDUID : 9983 EDUNAME: db2agent (SAMPLE) 0
FUNCTION: DB2 UDB, data protection services, sqlpWriteLR, probe:6680
MESSAGE : ZRC=0x85100009=-2062548983=SQLP_NOSPACE
"Log File has reached its saturation point"
DIA8309C Log file was full.
2013-07-15-15.29.01.046535+120 E8185399A590 LEVEL: Error
PID : 19857580 TID: 9983 PROC : db2sysc 0
INSTANCE: db2test NODE : 000 DB : SAMPLE
APPHDL: 0-10490 APPID: *LOCAL.db2test.130715132615
AUTHID: DB2TEST
EDUID : 9983 EDUNAME: db2agent (SAMPLE) 0
FUNCTION: DB2 UDB, data protection services, sqlpgResSpace, probe:2860
MESSAGE : ADM1823EThe active log is full and is held by application handle
"10409..".Terminate this application by COMMIT, ROLLBACK or FORCE
APPLICATION.
查看最早未提交的事务
db2"select db.DBPARTITIONNUM,ai.agent_id, substr(ai.appl_status,1,20) as Status,substr(ai.primary_auth_id,1,10) as Authid,substr(ai.appl_name,1,15) as Appl_Name,int(ap.UOW_LOG_SPACE_USED/1024/1024) as Log_Used_M,int(ap.appl_idle_time/60) as Idle_for_min,ap.appl_con_time as Connected_Since from sysibmadm.snapdb db,sysibmadm.snapappl ap,sysibmadm.snapappl_info ai where ai.agent_id=db.APPL_ID_OLDEST_XACT and ap.agent_id=ai.agent_id"
DBPARTITIONNUM AGENT_ID STATUS AUTHID APPL_NAME LOG_USED_MIDLE_FOR_MIN CONNECTED_SINCE
-------------- -------------------- -------------------- ---------- --------------- ----------- ------------ --------------------------
0 10409 UOWWAIT DB2TEST db2bp 0 0 2013-07-15-14.47.21.274710
1 record(s) selected
通过快照确定
db2 get snapshot for database on sample
Appl id holding the oldest transaction = 10409
查看此application的状态
db2 list applications show detail
CONNECT Auth Id Application Name Appl. Application Id Seq#Number ofCoordinating DBCoordinator Status Status Change Time DB NameDB Path
Handle Agents partition number pid/thread
-------------------------------------------------------------------------------------------------------------------------------- -------------------- ---------- -------------------------------------------------------------- ----- ---------- ---------------- --------------- ------------------------------ -------------------------- -------- --------------------
DB2TEST db2fw7 10421 *LOCAL.DB2.130715124733 00001 1 0 9211 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw0 10414 *LOCAL.DB2.130715124726 00001 1 0 7156 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw6 10420 *LOCAL.DB2.130715124732 00001 1 0 8954 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2lused 10413 *LOCAL.DB2.130715124725 00001 1 0 6899 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw5 10419 *LOCAL.DB2.130715124731 00001 1 0 8697 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2wlmd 10412 *LOCAL.DB2.130715124724 00001 1 0 6642 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw4 10418 *LOCAL.DB2.130715124730 00001 1 0 8440 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2taskd 10411 *LOCAL.DB2.130715124723 00001 1 0 6385 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw3 10417 *LOCAL.DB2.130715124729 00001 1 0 8183 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2stmm 10410 *LOCAL.DB2.130715124722 00001 1 0 6128 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw2 10416 *LOCAL.DB2.130715124728 00001 1 0 7670 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2bp 10409 *LOCAL.db2test.130715124721 00006 1 0 1759 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2bp 10455 *LOCAL.db2test.130715130654 00003 1 0 9726 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2evmg_DB2DETAILDEA 10422 *LOCAL.DB2.130715124734 00001 1 0 9468 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw1 10415 *LOCAL.DB2.130715124727 00001 1 0 7413 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
处于uow waiting 状态；
此时，尝试插入数据
$ db2 "insert into t1 values ('4','4')"
DB21034EThe command was processed as an SQL statement because it was not a
valid Command Line Processor command.During SQL processing it returned:
SQL0964CThe transaction log for the database is full.SQLSTATE=57011
查看此时的活动日志所在的目录空间
$ df -g /home/db2test/db2test/NODE0000/SQL00001/SQLOGDIR/
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/hd1 5.00 4.10 18% 470 1% /home
查看此时活动日志中的日志文件
$ ls /home/db2test/db2test/NODE0000/SQL00001/SQLOGDIR/
S0000001.LOGS0000002.LOGS0000003.LOGS0000004.LOGS0000005.LOG
查看此时归档日志中的日志文件以及归档情况
$ ls /home/db2test/arch_log/db2test/SAMPLE/NODE0000/C0000000/
S0000000.LOGS0000001.LOGS0000002.LOGS0000003.LOGS0000004.LOG
$ db2pd -d sample -logs
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 01:01:57 -- Date 07/15/2013 15:49:18
Logs:
Current Log Number 5
Pages Written 2
Cur Commit Disk Log Reads 0
Cur Commit Total Log Reads 0
Method 1 Archive Status Success
Method 1 Next Log to Archive5
Method 1 First Failure n/a
Method 2 Archive Status n/a
Method 2 Next Log to Archiven/a
Method 2 First Failure n/a
Log Chain ID 0
Current LSN 0x0000000004A53F21
Address StartLSN State Size Pages Filename
0x0A00020010068650 0000000004A3D010 0x00000000 5 5 S0000001.LOG
0x0A00020010068EB0 0000000004A42010 0x00000000 5 5 S0000002.LOG
0x0A00020010042330 0000000004A47010 0x00000000 5 5 S0000003.LOG
0x0A00020013EE8BB0 0000000004A4C010 0x00000000 5 5 S0000004.LOG
0x0A00020013EE9410 0000000004A51010 0x00000000 5 5 S0000005.LOG
因为有事务hold住日志，导致数据库在再次分配LSN时，此LSN被不能被分配新的LSN，造成日志空间无法使用,解决此问题
如果是uow waiting且已经等待很多天，force application,
$ db2 force application (10409)db2 "force application (10409)"force application (10409)"
DB20000IThe FORCE APPLICATION command completed successfully.
DB21024IThis command is asynchronous and may not be effective immediately.
$ db2 list applications show detail
CONNECT Auth Id Application Name Appl. Application Id Seq#Number ofCoordinating DBCoordinator Status Status Change Time DB NameDB Path
Handle Agents partition number pid/thread
-------------------------------------------------------------------------------------------------------------------------------- -------------------- ---------- -------------------------------------------------------------- ----- ---------- ---------------- --------------- ------------------------------ -------------------------- -------- --------------------
DB2TEST db2fw7 10421 *LOCAL.DB2.130715124733 00001 1 0 9211 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw0 10414 *LOCAL.DB2.130715124726 00001 1 0 7156 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw6 10420 *LOCAL.DB2.130715124732 00001 1 0 8954 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2lused 10413 *LOCAL.DB2.130715124725 00001 1 0 6899 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw5 10419 *LOCAL.DB2.130715124731 00001 1 0 8697 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2wlmd 10412 *LOCAL.DB2.130715124724 00001 1 0 6642 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw4 10418 *LOCAL.DB2.130715124730 00001 1 0 8440 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2taskd 10411 *LOCAL.DB2.130715124723 00001 1 0 6385 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw3 10417 *LOCAL.DB2.130715124729 00001 1 0 8183 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2stmm 10410 *LOCAL.DB2.130715124722 00001 1 0 6128 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw2 10416 *LOCAL.DB2.130715124728 00001 1 0 7670 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2bp 10455 *LOCAL.db2test.130715130654 00003 1 0 9726 UOW Waiting Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2evmg_DB2DETAILDEA 10422 *LOCAL.DB2.130715124734 00001 1 0 9468 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
DB2TEST db2fw1 10415 *LOCAL.DB2.130715124727 00001 1 0 7413 Connect Completed Not Collected SAMPLE /home/db2test/db2test/NODE0000/SQL00001/
检查hold日志的应用是否还存在
db2"select db.DBPARTITIONNUM,ai.agent_id, substr(ai.appl_status,1,20) as Status,substr(ai.primary_auth_id,1,10) as Authid,substr(ai.appl_name,1,15) as Appl_Name,int(ap.UOW_LOG_SPACE_USED/1024/1024) as Log_Used_M,int(ap.appl_idle_time/60) as Idle_for_min,ap.appl_con_time as Connected_Since from sysibmadm.snapdb db,sysibmadm.snapappl ap,sysibmadm.snapappl_info ai where ai.agent_id=db.APPL_ID_OLDEST_XACT and ap.agent_id=ai.agent_id"
DBPARTITIONNUM AGENT_ID STATUS AUTHID APPL_NAME LOG_USED_MIDLE_FOR_MIN CONNECTED_SINCE
-------------- -------------------- -------------------- ---------- --------------- ----------- ------------ --------------------------
0 record(s) selected.
查看归档日志和活动日志状况
归档日志
$ db2pd -d sample -logs
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 01:06:22 -- Date 07/15/2013 15:53:43
Logs:
Current Log Number 5
Pages Written 2
Cur Commit Disk Log Reads 0
Cur Commit Total Log Reads 0
Method 1 Archive Status Success
Method 1 Next Log to Archive5
Method 1 First Failure n/a
Method 2 Archive Status n/a
Method 2 Next Log to Archiven/a
Method 2 First Failure n/a
Log Chain ID 0
Current LSN 0x0000000004A53F6B
Address StartLSN State Size Pages Filename
0x0A00020013EE9410 0000000004A51010 0x00000000 5 5 S0000005.LOG
0x0A00020010068650 0000000004A56010 0x00000000 5 5 S0000006.LOG
0x0A00020010068EB0 0000000004A5B010 0x00000000 5 5 S0000007.LOG
0x0A00020010042330 0000000004A60010 0x00000000 5 5 S0000008.LOG
0x0A00020013E099B0 0000000004A65010 0x00000000 5 5 S0000009.LOG
$ ls /home/db2test/arch_log/db2test/SAMPLE/NODE0000/C0000000/
S0000000.LOGS0000001.LOGS0000002.LOGS0000003.LOGS0000004.LOG
活动日志
$ ls /home/db2test/db2test/NODE0000/SQL00001/SQLOGDIR/
S0000005.LOGS0000006.LOGS0000007.LOGS0000008.LOGS0000009.LOG
（被hold的日志被释放了，LSN继续分配）
查询数据库在窗口1
$ db2 "select count(*) from t1"
SQL1224NThe database manager is not able to accept new requests, has
terminated all requests in progress, or has terminated the specified request
because of an error or a forced interrupt.SQLSTATE=55032
因为已经被force掉了，重新连接再查询
$ db2 connect to sample
Database Connection Information
Database server = DB2/AIX64 9.7.5
SQL authorization ID = DB2TEST
Local database alias = SAMPLE
$ db2 "select count(*) from t1"
1
-----------
777
1 record(s) selected.
有一条因为hold住事务，在被杀掉后，回滚了。
结论：在生产系统中，遇到事务日志所在文件系统满的情况微乎其微，但是，遇到日志被hold住的可能却很高，这个时候的表象是文件系统有空间，但是日志使用率很高，此时，就可以考虑看一下是否需要检查一下是否有日志被hold了。
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