清理DB2的归档日志

上帝大脸

DB2归档日志的相关信息保存在恢复历史文件中，可以通过 db2 list history 命令查看。

db2inst1@suse-db:~> db2 list history archive log all for ggyy

List History File for ggyy

Number of matching file entries = 6

Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100103235553 1 D S0000038.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100103235553
End Time: 20100103235553
Status: A
----------------------------------------------------------------------------
EID: 80 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000038.LOG


Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100103235553 N S0000038.LOG
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment: ARCHIVE LOG
Start Time: 20100103235553
End Time: 20100103235553
Status: A
----------------------------------------------------------------------------
EID: 81

Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100103235608 1 D S0000039.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100103235608
End Time: 20100103235608
Status: A
----------------------------------------------------------------------------
EID: 82 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000039.LOG

......

清除这些信息，需要使用 db2 prune history 命令。该命令会清除指定时间戳及之前的所有条目（不只是归档日志的）。默认情况下，系统不会清除最近一次数据库全备之后的归档日志信息。

db2inst1@suse-db:~> db2 prune history 20100103235553
SQL1024N A database connection does not exist. SQLSTATE=00000
db2inst1@suse-db:~> db2 connect to ggyy

Database Connection Information

Database server = DB2/LINUX 9.7.0
SQL authorization ID = DB2INST1
Local database alias = GGYY

db2inst1@suse-db:~> db2 prune history 20100103235553
DB20000I The PRUNE command completed successfully.
db2inst1@suse-db:~> db2 list history archive log all for ggyy | head -20

List History File for ggyy

Number of matching file entries = 6


Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100103235553 1 D S0000038.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100103235553
End Time: 20100103235553
Status: A
----------------------------------------------------------------------------
EID: 80 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000038.LOG


db2inst1@suse-db:~> db2 list history backup all for ggyy

List History File for ggyy

Number of matching file entries = 0

对数据库进行一次全备，再次尝试清除：

db2inst1@suse-db:~> db2 backup db ggyy online to /data/backup

Backup successful. The timestamp for this backup image is : 20100104004121

db2inst1@suse-db:~> db2 connect to ggyy

Database Connection Information

Database server = DB2/LINUX 9.7.0
SQL authorization ID = DB2INST1
Local database alias = GGYY

db2inst1@suse-db:~> db2 prune history 20100103235553
DB20000I The PRUNE command completed successfully.
db2inst1@suse-db:~> db2 list history archive log all for ggyy | head -20

List History File for ggyy

Number of matching file entries = 5


Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100103235608 1 D S0000039.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100103235608
End Time: 20100103235608
Status: A
----------------------------------------------------------------------------
EID: 82 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000039.LOG


通过使用 and delete 参数，可以在清理条目的同时删除对应的归档日志文件。

db2inst1@suse-db:~> ls -l /data/palog/db2inst1/GGYY/NODE0000/C0000007
total 48
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:55 S0000038.LOG
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:56 S0000039.LOG
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:56 S0000040.LOG
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-04 00:41 S0000041.LOG
db2inst1@suse-db:~> db2 prune history 20100103235608 and delete
DB20000I The PRUNE command completed successfully.
db2inst1@suse-db:~> db2 list history archive log all for ggyy | head -20

List History File for ggyy

Number of matching file entries = 3


Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100103235618 1 D S0000040.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100103235618
End Time: 20100103235618
Status: A
----------------------------------------------------------------------------
EID: 84 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000040.LOG


db2inst1@suse-db:~> ls -l /data/palog/db2inst1/GGYY/NODE0000/C0000007
total 36
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:55 S0000038.LOG
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:56 S0000040.LOG
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-04 00:41 S0000041.LOG

可以看到，归档日志文件S0000039.LOG已被删除，但S0000038.LOG还存在，因为之前已经清除了S0000038.LOG的相关条目。
尝试同时清除S0000040.LOG和S0000041.LOG：

db2inst1@suse-db:~> db2 list history archive log all for ggyy | tail -15


Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100104004127 1 D S0000041.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100104004127
End Time: 20100104004128
Status: A
----------------------------------------------------------------------------
EID: 86 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000041.LOG

db2inst1@suse-db:~> db2 prune history 20100104004127 and delete
DB20000I The PRUNE command completed successfully.
db2inst1@suse-db:~> db2 list history archive log all for ggyy | head -20

List History File for ggyy

Number of matching file entries = 1


Op Obj Timestamp+Sequence Type Dev Earliest Log Current Log Backup ID
-- --- ------------------ ---- --- ------------ ------------ --------------
X D 20100104004127 1 D S0000041.LOG C0000007
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Comment:
Start Time: 20100104004127
End Time: 20100104004128
Status: A
----------------------------------------------------------------------------
EID: 86 Location: /data/palog/db2inst1/GGYY/NODE0000/C0000007/S0000041.LOG

db2inst1@suse-db:~> ls -l /data/palog/db2inst1/GGYY/NODE0000/C0000007/
total 24
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:55 S0000038.LOG
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-04 00:41 S0000041.LOG

S0000041.LOG依然存在，因为它是全备之后生成的。如果想要强制清除，可以使用 with force option 参数。

db2inst1@suse-db:~> db2 prune history 20100104004127 with force option and delete
DB20000I The PRUNE command completed successfully.
db2inst1@suse-db:~> db2 list history archive log all for ggyy | head -20

List History File for ggyy

Number of matching file entries = 0

db2inst1@suse-db:~> ls -l /data/palog/db2inst1/GGYY/NODE0000/C0000007/
total 12
-rw-r----- 1 db2inst1 db2iadm1 12288 2010-01-03 23:55 S0000038.LOG

注意，这里连带着将数据库全备的条目也删除了，但备份文件还在：

db2inst1@suse-db:/data/backup> db2 list history backup all for ggyy

List History File for ggyy

Number of matching file entries = 0

db2inst1@suse-db:/data/backup> ls -l /data/backup
total 99994
-rw------- 1 db2inst1 db2iadm1 102293504 2010-01-04 00:41 GGYY.0.db2inst1.NODE0000.CATN0000.20100104004121.001

此外，使用 db2 prune logfile 命令可以清除活动日志目录下的在线归档日志文件，但对离线归档日志文件无效，这里不再赘述。