分类目录归档：DB2

db2收集统计信息(runstats)

[db2inst1@xifenfei ~]$ db2 connect to xff

   Database Connection Information

 Database server        = DB2/LINUX 9.5.9
 SQL authorization ID   = DB2INST1
 Local database alias   = XFF

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478
T_02XFF                         DB2INST1        T     2012-04-11-18.30.26.639326
T_03XFF                         DB2INST1        T     2012-04-11-21.33.12.479480

  3 record(s) selected.

[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF','T_02XFF','T_03XFF')"

STATS_TIME                
--------------------------
2012-04-12-04.35.07.539790
2012-04-11-19.55.12.023748
2012-04-11-22.20.07.016905

  3 record(s) selected.

--收集表和索引统计信息,包括数据分布
[db2inst1@xifenfei ~]$ db2 "runstats on table db2inst1.t_01xff on all columns
with distribution and detailed indexes all"
DB20000I  The RUNSTATS command completed successfully.
[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF')"

STATS_TIME                
--------------------------
2012-04-28-23.43.23.904759

  1 record(s) selected.

--收集索引统计信息,如果表没有被收集,也会同时对表收集统计信息,对不会收集数据分布信息
[db2inst1@xifenfei ~]$ db2 "runstats on table db2inst1.t_02xff for  indexes all"
DB20000I  The RUNSTATS command completed successfully.


[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF','T_02XFF')"

STATS_TIME                
--------------------------
2012-04-28-23.43.23.904759
2012-04-28-23.44.39.762858

  2 record(s) selected.

db2 reorg操作

--删除部分表数据
[db2inst1@xifenfei ~]$ db2 "delete from t_01xff"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "delete from t_03xff"
DB20000I  The SQL command completed successfully.

--reorgchk检查是否需要进行reorg
[db2inst1@xifenfei ~]$ db2 reorgchk on schema db2inst1

Doing RUNSTATS ....


Table statistics:

F1: 100 * OVERFLOW / CARD < 5
F2: 100 * (Effective Space Utilization of Data Pages) > 70
F3: 100 * (Required Pages / Total Pages) > 80

SCHEMA.NAME                     CARD     OV     NP     FP ACTBLK    TSIZE  F1  F2  F3 REORG
----------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
                                   0      0      0     42      -        0   0   0   0 -** 
Table: DB2INST1.T_02XFF
                                 371      0     42     42      -   152110   0 100 100 --- 
Table: DB2INST1.T_03XFF
                                   0      0      0     83      -        0   0   0   0 -** 
----------------------------------------------------------------------------------------

Index statistics:

F4: CLUSTERRATIO or normalized CLUSTERFACTOR > 80
F5: 100 * (Space used on leaf pages / Space available on non-empty leaf pages) > MIN(50, (100 - PCTFREE))
F6: (100 - PCTFREE) * (Amount of space available in an index with one less level / Amount of space required for all keys) < 100
F7: 100 * (Number of pseudo-deleted RIDs / Total number of RIDs) < 20
F8: 100 * (Number of pseudo-empty leaf pages / Total number of leaf pages) < 20

SCHEMA.NAME                 INDCARD  LEAF ELEAF LVLS  NDEL    KEYS LEAF_RECSIZE NLEAF_RECSIZE LEAF_PAGE_OVERHEAD NLEAF_PAGE_OVERHEAD  F4  F5  F6  F7  F8 REORG  
--------------------------------------------------------------------------------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
Index: DB2INST1.I_T_01XFF
                                  0     3     3    2     0       0            2             2                822                 822 100   0   -   0 100 ----* 
--------------------------------------------------------------------------------------------------------------------------------------------------------------

CLUSTERRATIO or normalized CLUSTERFACTOR (F4) will indicate REORG is necessary 
for indexes that are not in the same sequence as the base table. When multiple 
indexes are defined on a table, one or more indexes may be flagged as needing 
REORG.  Specify the most important index for REORG sequencing.

Tables defined using the ORGANIZE BY clause and the corresponding dimension 
indexes have a '*' suffix to their names. The cardinality of a dimension index 
is equal to the Active blocks statistic of the table.

--离线reorg index
[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_01xff index DB2INST1.I_T_01XFF allow read access
DB20000I  The REORG command completed successfully.

--在线reorg table
[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_01xff inplace allow write access
DB20000I  The REORG command completed successfully.
DB21024I  This command is asynchronous and may not be effective immediately.

[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_03xff inplace allow write access
DB20000I  The REORG command completed successfully.
DB21024I  This command is asynchronous and may not be effective immediately.

--证明异步操作完成
[db2inst1@xifenfei ~]$ ps -ef|grep db2reo
db2inst1  1496  1311  0 00:24 pts/1    00:00:00 grep db2reo

--检查reorg操作结果
[db2inst1@xifenfei ~]$ db2 reorgchk on schema db2inst1

Doing RUNSTATS ....


Table statistics:

F1: 100 * OVERFLOW / CARD < 5
F2: 100 * (Effective Space Utilization of Data Pages) > 70
F3: 100 * (Required Pages / Total Pages) > 80

SCHEMA.NAME                     CARD     OV     NP     FP ACTBLK    TSIZE  F1  F2  F3 REORG
----------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
                                   0      0      0      1      -        0   0   -   0 --- 
Table: DB2INST1.T_02XFF
                                 371      0     42     42      -   152110   0 100 100 --- 
Table: DB2INST1.T_03XFF
                                   0      0      0      1      -        0   0   -   0 --- 
----------------------------------------------------------------------------------------

Index statistics:

F4: CLUSTERRATIO or normalized CLUSTERFACTOR > 80
F5: 100 * (Space used on leaf pages / Space available on non-empty leaf pages) > MIN(50, (100 - PCTFREE))
F6: (100 - PCTFREE) * (Amount of space available in an index with one less level / Amount of space required for all keys) < 100
F7: 100 * (Number of pseudo-deleted RIDs / Total number of RIDs) < 20
F8: 100 * (Number of pseudo-empty leaf pages / Total number of leaf pages) < 20

SCHEMA.NAME                 INDCARD  LEAF ELEAF LVLS  NDEL    KEYS LEAF_RECSIZE NLEAF_RECSIZE LEAF_PAGE_OVERHEAD NLEAF_PAGE_OVERHEAD  F4  F5  F6  F7  F8 REORG  
--------------------------------------------------------------------------------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
Index: DB2INST1.I_T_01XFF
                                  0     1     0    1     0       0            2             2                822                 822 100   -   -   0   0 ----- 
--------------------------------------------------------------------------------------------------------------------------------------------------------------

CLUSTERRATIO or normalized CLUSTERFACTOR (F4) will indicate REORG is necessary 
for indexes that are not in the same sequence as the base table. When multiple 
indexes are defined on a table, one or more indexes may be flagged as needing 
REORG.  Specify the most important index for REORG sequencing.

Tables defined using the ORGANIZE BY clause and the corresponding dimension 
indexes have a '*' suffix to their names. The cardinality of a dimension index 
is equal to the Active blocks statistic of the table.

全备数据库

[db2inst1@xifenfei ~]$ db2 backup db xff online to /tmp  include logs

Backup successful. The timestamp for this backup image is : 20120411213218

[db2inst1@xifenfei ~]$ db2 list history backup all for xff

                    List History File for xff

Number of matching file entries = 1


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411213218001   N    D  S0000021.LOG S0000021.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411213218
   End Time: 20120411213229
     Status: A
 ----------------------------------------------------------------------------
  EID: 42 Location: /tmp

数据操作(包括误操作)

[db2inst1@xifenfei ~]$ db2 connect to xff

   Database Connection Information

 Database server        = DB2/LINUX 9.5.9
 SQL authorization ID   = DB2INST1
 Local database alias   = XFF

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478
T_02XFF                         DB2INST1        T     2012-04-11-18.30.26.639326

  2 record(s) selected.

[db2inst1@xifenfei ~]$ db2 "create table t_03xff like t_01xff"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "insert into t_03xff select * from t_01xff"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ date
Wed Apr 11 21:33:42 CST 2012
[db2inst1@xifenfei ~]$ db2 "select count(*) from t_03xff"

1          
-----------
        370

  1 record(s) selected.

--以下是错误操作,需要回滚
[db2inst1@xifenfei ~]$ date
Wed Apr 11 21:36:38 CST 2012
[db2inst1@xifenfei ~]$ db2 "insert into t_03xff select * from t_01xff"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "select count(*) from t_03xff"

1          
-----------
        740

  1 record(s) selected.

还原数据库

db2inst1@xifenfei ~]$ db2 restore db xff from /tmp taken at 20120411213218
SQL2539W  Warning!  Restoring to an existing database that is the same as the 
backup image database.  The database files will be deleted.
Do you want to continue ? (y/n) y
DB20000I  The RESTORE DATABASE command completed successfully.

恢复数据库

[db2inst1@xifenfei ~]$ db2 rollforward db xff to 2012-04-11-21.36.00.00000 using local time

                                 Rollforward Status

 Input database alias                   = xff
 Number of nodes have returned status   = 1

 Node number                            = 0
 Rollforward status                     = DB  working
 Next log file to be read               = S0000023.LOG
 Log files processed                    = S0000021.LOG - S0000021.LOG
 Last committed transaction             = 2012-04-11-21.33.27.000000 Local

DB20000I  The ROLLFORWARD command completed successfully.
[db2inst1@xifenfei ~]$ db2 connect to xff
SQL1117N  A connection to or activation of database "XIFENFEI" cannot be made 
because of ROLL-FORWARD PENDING.  SQLSTATE=57019

--停止前滚
[db2inst1@xifenfei ~]$ db2 rollforward db xff stop

                                 Rollforward Status

 Input database alias                   = xff
 Number of nodes have returned status   = 1

 Node number                            = 0
 Rollforward status                     = not pending
 Next log file to be read               =
 Log files processed                    = S0000021.LOG - S0000022.LOG
 Last committed transaction             = 2012-04-11-21.33.27.000000 Local

DB20000I  The ROLLFORWARD command completed successfully.

验证数据

[db2inst1@xifenfei ~]$ db2 connect to xff

   Database Connection Information

 Database server        = DB2/LINUX 9.5.9
 SQL authorization ID   = DB2INST1
 Local database alias   = XFF

[db2inst1@xifenfei ~]$ db2 "select count(*) from t_03xff"

1          
-----------
        370

  1 record(s) selected.

全备数据库

[db2inst1@xifenfei ~]$ db2 backup db xff online to /tmp  include logs

Backup successful. The timestamp for this backup image is : 20120411181918


[db2inst1@xifenfei ~]$ db2 list history backup all for xff

                    List History File for xff

Number of matching file entries = 1


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411181918001   N    D  S0000015.LOG S0000015.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411181918
   End Time: 20120411181925
     Status: A
 ----------------------------------------------------------------------------
  EID: 27 Location: /tmp

修改数据

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_XFF                           DB2INST1        T     2012-04-05-09.45.29.148434
T_XIFENFEI                      DB2INST1        T     2012-04-06-05.50.11.111469
T_XIFENFEI01                    DB2INST1        T     2012-04-11-16.55.51.853649

  3 record(s) selected.


[db2inst1@xifenfei ~]$ db2 "drop table t_xff"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "drop table t_xifenfei"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "drop table t_xifenfei01"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "create table t_01xff like syscat.tables"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "insert into t_01xff select * from syscat.tables"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "select count(*) from t_01xff"

1          
-----------
        370

  1 record(s) selected.

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478

  1 record(s) selected.

增量备份SQL2426N解决

[db2inst1@xifenfei ~]$ db2 backup db xff online incremental to /tmp 
SQL2426N  The database has not been configured to allow the incremental backup 
operation. Reason code = "1".

[db2inst1@xifenfei ~]$ db2 ? SQL2426N


SQL2426N  The database has not been configured to allow the incremental
      backup operation. Reason code = "<reason-code>".

Explanation: 

Incremental backups are not enabled for a table space until after
modification tracking has been activated for the database and a
non-incremental backup has been performed on the table space.

Possible reason codes: 
1. The configuration parameter TRACKMOD has not been set for the
   database.
2. The TRACKMOD configuration parameter has been set but at least one
   table space has not had a non-incremental backup taken since the
   TRACKMOD parameter was set.

User response: 

The action is based on the reason code as follows: 
1. Activate modification tracking for the database by setting the
   TRACKMOD database configuration parameter to on, then perform a full
   database backup.
2. Consult the db2diag.log file to determine the name of the table
   space, then perform a full backup of that table space.

[db2inst1@xifenfei ~]$ db2 get db cfg for xff|grep TRACKMOD
 Track modified pages                         (TRACKMOD) = NO

[db2inst1@xifenfei ~]$ db2 update db cfg for xff using TRACKMOD ON
DB20000I  The UPDATE DATABASE CONFIGURATION command completed successfully.
SQL1363W  One or more of the parameters submitted for immediate modification 
were not changed dynamically. For these configuration parameters, the database 
must be shutdown and reactivated before the configuration parameter changes 
become effective.

[db2inst1@xifenfei ~]$ db2stop force
04/11/2012 17:49:59     0   0   SQL1064N  DB2STOP processing was successful.
SQL1064N  DB2STOP processing was successful.
[db2inst1@xifenfei ~]$ db2start
04/11/2012 17:50:09     0   0   SQL1063N  DB2START processing was successful.
SQL1063N  DB2START processing was successful.

累积增量备份

[db2inst1@xifenfei ~]$ db2 backup db xff online incremental to /tmp

Backup successful. The timestamp for this backup image is : 20120411182708

[db2inst1@xifenfei ~]$ db2 list history backup all for xff

                    List History File for xff

Number of matching file entries = 2


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411181918001   N    D  S0000015.LOG S0000015.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411181918
   End Time: 20120411181925
     Status: A
 ----------------------------------------------------------------------------
  EID: 27 Location: /tmp


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411182708001   O    D  S0000017.LOG S0000017.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411182708
   End Time: 20120411182712
     Status: A
 ----------------------------------------------------------------------------
  EID: 33 Location: /tmp

再次修改数据

[db2inst1@xifenfei ~]$ db2 "create table t_02xff like syscat.tables"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "insert into t_02xff select * from syscat.tables"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478
T_02XFF                         DB2INST1        T     2012-04-11-18.30.26.639326

  2 record(s) selected.

[db2inst1@xifenfei ~]$ db2 "select count(*) from t_02xff"

1          
-----------
        371

  1 record(s) selected.

迭代备份

[db2inst1@xifenfei ~]$ db2 backup db xff online incremental delta to /tmp

Backup successful. The timestamp for this backup image is : 20120411183129

[db2inst1@xifenfei ~]$ ll /tmp/XFF*
-rw-------  1 db2inst1 db2iadm1 122044416 Apr 11 18:19 /tmp/XFF.0.db2inst1.NODE0000.CATN0000.20120411181918.001
-rw-------  1 db2inst1 db2iadm1  55128064 Apr 11 18:27 /tmp/XFF.0.db2inst1.NODE0000.CATN0000.20120411182708.001
-rw-------  1 db2inst1 db2iadm1  55128064 Apr 11 18:31 /tmp/XFF.0.db2inst1.NODE0000.CATN0000.20120411183129.001
--这里可以看出最近一次的增量备份和迭代备份备份文件大小相同,说明迭代备份是在最近一次增量备份基础之上进行

[db2inst1@xifenfei ~]$ db2 list history backup all for xff

                    List History File for xff

Number of matching file entries = 3


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411181918001   N    D  S0000015.LOG S0000015.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411181918
   End Time: 20120411181925
     Status: A
 ----------------------------------------------------------------------------
  EID: 27 Location: /tmp


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411182708001   O    D  S0000017.LOG S0000017.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411182708
   End Time: 20120411182712
     Status: A
 ----------------------------------------------------------------------------
  EID: 33 Location: /tmp


 Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log  Backup ID
 -- --- ------------------ ---- --- ------------ ------------ --------------
  B  D  20120411183129001   E    D  S0000019.LOG S0000019.LOG  
 ----------------------------------------------------------------------------
  Contains 3 tablespace(s):

 00001 SYSCATSPACE
 00002 USERSPACE1
 00003 SYSTOOLSPACE
 ----------------------------------------------------------------------------
    Comment: DB2 BACKUP XFF ONLINE
 Start Time: 20120411183129
   End Time: 20120411183133
     Status: A
 ----------------------------------------------------------------------------
  EID: 36 Location: /tmp

还原数据库

[db2inst1@xifenfei ~]$ db2 restore db xff  incremental automatic from /tmp taken at 20120411183129
SQL2539W  Warning!  Restoring to an existing database that is the same as the 
backup image database.  The database files will be deleted.
Do you want to continue ? (y/n) y
DB20000I  The RESTORE DATABASE command completed successfully.

尝试登陆数据库

[db2inst1@xifenfei ~]$ db2 connect to xff
SQL1117N  A connection to or activation of database "XIFENFEI" cannot be made 
because of ROLL-FORWARD PENDING.  SQLSTATE=57019
--数据库需要前滚,因为是在线备份

恢复数据库

[db2inst1@xifenfei ~]$  db2 "rollforward db xff to end of logs and stop"

                                 Rollforward Status

 Input database alias                   = xff
 Number of nodes have returned status   = 1

 Node number                            = 0
 Rollforward status                     = not pending
 Next log file to be read               =
 Log files processed                    = S0000019.LOG - S0000019.LOG
 Last committed transaction             = 2012-04-11-10.31.30.000000 UTC

DB20000I  The ROLLFORWARD command completed successfully.

验证恢复过程

[db2inst1@xifenfei ~]$ db2 connect to xff

   Database Connection Information

 Database server        = DB2/LINUX 9.5.9
 SQL authorization ID   = DB2INST1
 Local database alias   = XFF

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478
T_02XFF                         DB2INST1        T     2012-04-11-18.30.26.639326

  2 record(s) selected.

[db2inst1@xifenfei ~]$ db2 "select count(*) from t_01xff"

1          
-----------
        370

  1 record(s) selected.

[db2inst1@xifenfei ~]$ db2 "select count(*) from t_02xff"

1          
-----------
        371

  1 record(s) selected.

本篇主要测试了增量备份和数据库恢复,在下篇中将对不完全恢复进行测试,坚持逐步学习db2数据库相关知识