DB2日志被hold导致日志空间满模拟

 

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')" 

DB20000I  The 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 : ADM1823E  The 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_M  IDLE_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 of  Coordinating DB  Coordinator     Status                         Status Change Time         DB Name  DB 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')" 
DB21034E  The command was processed as an SQL statement because it was not a 
valid Command Line Processor command.  During SQL processing it returned: 
SQL0964C  The 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.LOG  S0000002.LOG  S0000003.LOG  S0000004.LOG  S0000005.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.LOG  S0000001.LOG  S0000002.LOG  S0000003.LOG  S0000004.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 Archive  5 

Method 1 First Failure        n/a 

Method 2 Archive Status       n/a 

Method 2 Next Log to Archive  n/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)" 

DB20000I  The FORCE APPLICATION command completed successfully. 

DB21024I  This command is asynchronous and may not be effective immediately. 

  

$ db2 list applications show detail 

  

CONNECT Auth Id                                                                                                                  Application Name     Appl.      Application Id                                                 Seq#  Number of  Coordinating DB  Coordinator     Status                         Status Change Time         DB Name  DB 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_M  IDLE_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 Archive  5 

Method 1 First Failure        n/a 

Method 2 Archive Status       n/a 

Method 2 Next Log to Archive  n/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.LOG  S0000001.LOG  S0000002.LOG  S0000003.LOG  S0000004.LOG 

活动日志 

$ ls /home/db2test/db2test/NODE0000/SQL00001/SQLOGDIR/ 

S0000005.LOG  S0000006.LOG  S0000007.LOG  S0000008.LOG  S0000009.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" 

SQL1224N  The 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。

 

 

 

 

 

你可能感兴趣的:(db2)