20170315測試線上日誌與備用日誌大小不一樣
[20170315]測試線上日誌與備用日誌大小不一樣.txt
--//今天測試一下,主庫的線上日誌與備庫的備用日誌大小不一樣的情況,因為備庫日誌主要目的是接收主庫傳輸過來的日誌並應用日誌.
--//僅僅測試備用日誌小於主庫線上日誌的情況.
--//一般運維要求日誌大小線上與備用大小一致,備用日誌的數量比線上日誌數量+1,如果rac環境也就是每個例項比線上日誌多一組.
--//滿足業務高峰20-30分鐘切換一次就ok了.
--//出現不一致的情況,主要是主庫修改日誌大小,而備庫忘記修改.測試這種情況下會出現什麼情況:
1.環境:
SYS@book> @ &r/ver1
PORT_STRING VERSION BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
--//備庫
SYS@bookdg> @ &r/logfile
GROUP# STATUS TYPE MEMBER IS_ GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME
------ ---------- ---------- -------------------------------- --- ------ ------- --------- ----------- --------- ------- --- ---------- ------------- ------------------- ------------ -------------------
1 ONLINE /mnt/ramdisk/book/redo01.log NO 1 1 805 52428800 512 1 YES CURRENT 13277509688 2017-03-15 09:21:13 13277509678 2017-03-15 09:21:11
2 ONLINE /mnt/ramdisk/book/redo02.log NO 2 1 803 52428800 512 1 YES CLEARING 13277509678 2017-03-15 09:21:11 13277509683 2017-03-15 09:21:12
3 ONLINE /mnt/ramdisk/book/redo03.log NO 3 1 804 52428800 512 1 YES CLEARING 13277509683 2017-03-15 09:21:12 13277509688 2017-03-15 09:21:13
4 STANDBY /mnt/ramdisk/book/redostb01.log NO
5 STANDBY /mnt/ramdisk/book/redostb02.log NO
6 STANDBY /mnt/ramdisk/book/redostb03.log NO
7 STANDBY /mnt/ramdisk/book/redostb04.log NO
7 rows selected.
SYS@bookdg> select * from v$standby_log;
GROUP# DBID THREAD# SEQUENCE# BYTES BLOCKSIZE USED ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME LAST_CHANGE# LAST_TIME
------ ----------- ------- --------- ----------- --------- ------------ --- ---------- ------------- ------------------- ------------ ------------------- ------------ -------------------
4 UNASSIGNED 1 0 52428800 512 0 NO UNASSIGNED
5 1337401710 1 805 52428800 512 76288 YES ACTIVE 13277509688 2017-03-15 09:21:13 13277509837 2017-03-15 09:23:42
6 UNASSIGNED 1 0 52428800 512 0 NO UNASSIGNED
7 UNASSIGNED 0 0 52428800 512 0 YES UNASSIGNED
--//當前是group#=5在接收日誌.
2.刪除備庫的備用日誌:
SYS@bookdg> alter database drop standby logfile group 4;
alter database drop standby logfile group 4
*
ERROR at line 1:
ORA-01156: recovery or flashback in progress may need access to files
$ oerr ora 01156
01156, 00000, "recovery or flashback in progress may need access to files"
// *Cause: Either media recovery, instance recovery, or flashback was
// in progress. The recovery or flashback in progress may need
// the files to which this operation is being applied.
// *Action: Wait for recovery or flashback to complete.
SYS@bookdg> alter database recover managed standby database cancel ;
Database altered.
SYS@bookdg> alter database drop standby logfile group 4;
Database altered.
SYS@bookdg> alter database drop standby logfile group 6;
Database altered.
SYS@bookdg> alter database drop standby logfile group 7;
Database altered.
SYS@bookdg> alter database drop standby logfile group 5;
alter database drop standby logfile group 5
*
ERROR at line 1:
ORA-00261: log 5 of thread 1 is being archived or modified
ORA-00312: online log 5 thread 1: '/mnt/ramdisk/book/redostb02.log'
--//在用無法drop.
--//主庫執行:
SYS@book> alter system archive log current;
System altered.
--//備庫執行:
SYS@bookdg> alter database drop standby logfile group 5;
Database altered.
--//ok現在刪除備庫全部備用日誌.現在建立新的備用日誌,大小20M
--//alter database add standby logfile ('/mnt/ramdisk/book/redostb01.log') size 50m ;
SYS@bookdg> alter database add standby logfile group 4 ('/mnt/ramdisk/book/redostb01.log') size 20m reuse;
Database altered.
alter database add standby logfile group 5 ('/mnt/ramdisk/book/redostb02.log') size 20m reuse;
alter database add standby logfile group 6 ('/mnt/ramdisk/book/redostb03.log') size 20m reuse;
alter database add standby logfile group 7 ('/mnt/ramdisk/book/redostb04.log') size 20m reuse;
GROUP# DBID THREAD# SEQUENCE# BYTES BLOCKSIZE USED ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME LAST_CHANGE# LAST_TIME
------ ---------- ------- --------- ----------- --------- ------------ --- ---------- ------------- ------------------- ------------ ------------------- ------------ -------------------
4 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
5 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
6 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
7 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
--//現在全部是20M.
3.開啟日誌傳輸與應用看看:
SYS@bookdg> alter database recover managed standby database using current logfile disconnect ;
Database altered.
SYS@bookdg> select * from v$standby_log;
GROUP# DBID THREAD# SEQUENCE# BYTES BLOCKSIZE USED ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME LAST_CHANGE# LAST_TIME
------ ---------- ------- ---------- ---------- ---------- ---------- --- ---------- ------------- ------------------- ------------ ------------------- ------------ -------------------
4 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
5 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
6 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
7 UNASSIGNED 0 0 20971520 512 0 YES UNASSIGNED
--//可以發現備用日誌並不接受日誌.
SYS@bookdg> @ &r/dg/dg
PROCESS PID STATUS CLIENT_P GROUP# THREAD# SEQUENCE# BLOCK# BLOCKS DELAY_MINS
--------- ------- ------------ -------- ------- ------- ---------- ---------- ---------- ----------
RFS 10079 IDLE ARCH N/A 0 0 0 0 0
RFS 10077 IDLE LGWR 2 1 806 940 1 0
ARCH 10072 CLOSING ARCH 5 1 805 1 462 0
MRP0 10163 WAIT_FOR_LOG N/A N/A 1 806 0 0 0
--//這樣並不能使用實時應用.MRP0僅僅停止在block#=0的情況.RFS PID=10077 group#=2在接收.
--//主庫執行:
SYS@book> alter system archive log current;
System altered.
--//備庫執行:
SYS@bookdg> @ &r/dg/dg
PROCESS PID STATUS CLIENT_P GROUP# THREAD# SEQUENCE# BLOCK# BLOCKS DELAY_MINS
--------- ------- ------------ -------- --------------- ---------- ---------- ---------- ----------
RFS 10079 IDLE ARCH N/A 0 0 0 0 0
RFS 10077 IDLE LGWR 3 1 807 16 1 0
ARCH 10072 CLOSING ARCH 5 1 805 1 462 0
MRP0 10163 WAIT_FOR_LOG N/A N/A 1 807 0 0 0
--//可以發現在歸檔後才應用,也就是延遲應用.
--//實際上RFS PID=10077 group#=3在接收.真的碼?
SYS@bookdg> alter system dump logfile '/mnt/ramdisk/book/redo03.log' validate ;
alter system dump logfile '/mnt/ramdisk/book/redo03.log' validate
*
ERROR at line 1:
ORA-00339: archived log does not contain any redo
ORA-00334: archived log: '/mnt/ramdisk/book/redo03.log'
--//很明顯接收的不是線上日誌,而是
$ ls -l /proc/10077/fd
total 14
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 0 -> /dev/null
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 1 -> /dev/null
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 14 -> socket:[429975916]
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 2 -> /dev/null
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 256 -> /data/ramdisk/book/control01.ctl
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 257 -> /data/ramdisk/book/control02.ctl
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 258 -> /u01/app/oracle/archivelog/book/1_807_896605872.dbf
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 3 -> /dev/null
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 4 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 5 -> /proc/10077/fd
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 6 -> /dev/zero
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 7 -> /u01/app/oracle/admin/book/adump/bookdg_ora_10077_20170315091852338409143795.aud
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 8 -> /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_rfs_10077.trc
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 9 -> /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_rfs_10077.trm
$ ls -l /u01/app/oracle/archivelog/book/1_807_896605872.dbf
-rw-r----- 1 oracle oinstall 52429312 2017-03-15 09:54:41 /u01/app/oracle/archivelog/book/1_807_896605872.dbf
--//很明顯接收日誌的是歸檔目的檔案/u01/app/oracle/archivelog/book/1_807_896605872.dbf.注意大小52429312/1024/1024= 50M+512位元組.
--//主庫執行:
SYS@book> alter system archive log current;
System altered.
--//備庫執行:
$ ls -l /u01/app/oracle/archivelog/book/1_807_896605872.dbf
-rw-r----- 1 oracle oinstall 409600 2017-03-15 09:56:40 /u01/app/oracle/archivelog/book/1_807_896605872.dbf
--//現在才還歸檔的檔案大小.
4.採用備用日誌檔案大小大於線上日誌.
SYS@bookdg> alter database recover managed standby database cancel ;
Database altered.
alter database drop standby logfile group 4;
alter database drop standby logfile group 5;
alter database drop standby logfile group 6;
alter database drop standby logfile group 7;
alter database add standby logfile group 4 ('/mnt/ramdisk/book/redostb01.log') size 60m reuse;
alter database add standby logfile group 5 ('/mnt/ramdisk/book/redostb02.log') size 60m reuse;
alter database add standby logfile group 6 ('/mnt/ramdisk/book/redostb03.log') size 60m reuse;
alter database add standby logfile group 7 ('/mnt/ramdisk/book/redostb04.log') size 60m reuse;
--//再次啟動日誌傳輸與應用.
SYS@bookdg> alter database recover managed standby database using current logfile disconnect ;
Database altered.
SYS@bookdg> select * from v$standby_log;
GROUP# DBID THREAD# SEQUENCE# BYTES BLOCKSIZE USED ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME LAST_CHANGE# LAST_TIME
------ ---------- ------- ---------- ---------- ---------- ---------- --- ---------- ------------- ------------------- ------------ ------------------- ------------ -------------------
4 1337401710 1 809 62914560 512 1536 YES ACTIVE 1.3278E+10 2017-03-15 10:01:04 1.3278E+10 2017-03-15 10:01:05
5 UNASSIGNED 0 0 62914560 512 0 YES UNASSIGNED
6 UNASSIGNED 0 0 62914560 512 0 YES UNASSIGNED
7 UNASSIGNED 0 0 62914560 512 0 YES UNASSIGNED
SYS@bookdg> @ &r/dg/dg
PROCESS PID STATUS CLIENT_P GROUP# THREAD# SEQUENCE# BLOCK# BLOCKS DELAY_MINS
--------- ------- ------------ -------- ------- ------- ---------- ---------- ---------- ----------
RFS 10079 IDLE ARCH N/A 0 0 0 0 0
RFS 10077 IDLE LGWR 2 1 809 42 1 0
ARCH 10072 CLOSING ARCH 5 1 805 1 462 0
MRP0 10232 APPLYING_LOG N/A N/A 1 809 42 122880 0
--//現在備用日誌接收並應用日誌.
--//再看看相關程式開啟檔案控制程式碼的情況.
$ ls -l /proc/10232/fd
total 14
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 0 -> /dev/null
l-wx------ 1 oracle oinstall 64 2017-03-15 10:02:21 1 -> /dev/null
l-wx------ 1 oracle oinstall 64 2017-03-15 10:02:21 10 -> /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_mrp0_10232.trc
l-wx------ 1 oracle oinstall 64 2017-03-15 10:02:21 11 -> /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_mrp0_10232.trm
l-wx------ 1 oracle oinstall 64 2017-03-15 10:02:21 2 -> /dev/null
lrwx------ 1 oracle oinstall 64 2017-03-15 10:02:21 256 -> /data/ramdisk/book/control01.ctl
lrwx------ 1 oracle oinstall 64 2017-03-15 10:02:21 257 -> /data/ramdisk/book/control02.ctl
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 3 -> /dev/null
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 4 -> /dev/null
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 5 -> /dev/null
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 6 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 7 -> /proc/10232/fd
lr-x------ 1 oracle oinstall 64 2017-03-15 10:02:21 8 -> /dev/zero
lrwx------ 1 oracle oinstall 64 2017-03-15 10:02:21 9 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/hc_bookdg.dat
--//可以發現MPR0程式10232並沒有開啟相關備用日誌控制程式碼.
$ ls -l /proc/10077/fd
total 14
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 0 -> /dev/null
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 1 -> /dev/null
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 14 -> socket:[429975916]
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 2 -> /dev/null
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 256 -> /data/ramdisk/book/control01.ctl
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 257 -> /data/ramdisk/book/control02.ctl
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 258 -> /data/ramdisk/book/redostb01.log
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 3 -> /dev/null
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 4 -> /u01/app/oracle/product/11.2.0.4/dbhome_1/rdbms/mesg/oraus.msb
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 5 -> /proc/10077/fd
lr-x------ 1 oracle oinstall 64 2017-03-15 09:51:18 6 -> /dev/zero
lrwx------ 1 oracle oinstall 64 2017-03-15 09:51:18 7 -> /u01/app/oracle/admin/book/adump/bookdg_ora_10077_20170315091852338409143795.aud
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 8 -> /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_rfs_10077.trc
l-wx------ 1 oracle oinstall 64 2017-03-15 09:51:18 9 -> /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_rfs_10077.trm
--//可以發現RFS PID=10077,開啟備用日誌/data/ramdisk/book/redostb01.log的控制程式碼.
5.總結:
--維護線上日誌更改大小時注意同時備庫備用日誌的大小,一般最簡單的方式生成新的備用控制檔案.啟用新的備用控制檔案.
--最佳的方式保持線上與備用日誌大小一致.
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/28211342/viewspace-2135433/，如需轉載，請註明出處，否則將追究法律責任。
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