Oracle DataGuard环境主备库日志组数和大小调整

Oracle DataGuard主备库日志组数和大小调整：

检查当前主备的redo日志文件和standby日志文件：

redo log:

select l.group#,l.bytes/1024/1024 mb,lf.member from v$log l,v$logfile lf where l.group#=lf.group# order by group#;

select group#,status from v$log;

standby log:

select sl.group#,sl.bytes/1024/1024 mb,lf.member from v$standby_log sl,v$logfile lf where sl.group#=lf.group# order by group#;

select group#,status from v$standby_log;

一、增减日志文件：

1、在主库和备库都设置standby_file_management为manual

alter system set standby_file_management='manual';

2、备库上停止恢复：

alter database recover managed standby database cancel;

3、在主库和备库上增加或者减少online和standby日志：

增加：

alter database add logfile group 2 ('/u02/app/oracle/oradata/ncf/redo02a.log','/u02/app/oracle/oradata/ncf/redo02b.log') size 200m;

alter database add standby logfile group 13 ('/u02/app/oracle/oradata/ncf/standby13_1.log','/u02/app/oracle/oradata/ncf/standby13_2.log') size 200m;

减少：

如果显示状态为clearing，则先clear，再删除日志：

alter database clear logfile group 8;

alter database drop logfile group 8;

host rm -rf /u02/app/oracle/oradata/ncf/redo08a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo08b.log

4、在主库和备库设置standby_file_management为auto

alter system set standby_file_management='auto';

5、备库上启动同步：

alter database recover managed standby database using current logfile disconnect;

6、检查状态：

主库多次执行：alter system switch logfile;

主库：select max(sequence#) from v$archived_log;

备库：select max(sequence#) from v$archived_log where applied='YES';

     SELECT name,value,time_computed FROM V$DATAGUARD_STATS WHERE NAME like '%lag%';

二、修改日志文件大小：

1、在主库和备库都设置standby_file_management为manual

alter system set standby_file_management='manual';

2、备库上停止恢复：

alter database recover managed standby database cancel;

3、主库操作：

处理主库的redo log：

select l.group#,l.bytes/1024/1024 mb,lf.member from v$log l,v$logfile lf where l.group#=lf.group# order by group#;

    GROUP#       MB MEMBER

---------- ---------- --------------------------------------------------

     2      50 /u02/app/oracle/oradata/ncf/redo02a.log

     2      50 /u02/app/oracle/oradata/ncf/redo02b.log

     3      50 /u02/app/oracle/oradata/ncf/redo03a.log

     3      50 /u02/app/oracle/oradata/ncf/redo03b.log

     4      50 /u02/app/oracle/oradata/ncf/redo04a.log

     4      50 /u02/app/oracle/oradata/ncf/redo04b.log

select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

     2 CURRENT

     3 INACTIVE

     4 INACTIVE

alter database drop logfile group 4;

host rm -rf /u02/app/oracle/oradata/ncf/redo04a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo04b.log

alter database add logfile group 4 ('/u02/app/oracle/oradata/ncf/redo04a.log','/u02/app/oracle/oradata/ncf/redo04b.log') size 100m;

alter database drop logfile group 3;

host rm -rf /u02/app/oracle/oradata/ncf/redo03a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo03b.log

alter database add logfile group 3 ('/u02/app/oracle/oradata/ncf/redo03a.log','/u02/app/oracle/oradata/ncf/redo03b.log') size 100m;

alter system switch logfile;

select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

     2 ACTIVE

     3 CURRENT

     4 UNUSED

alter system checkpoint;

select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

     2 INACTIVE

     3 CURRENT

     4 UNUSED

alter database drop logfile group 2;

host rm -rf /u02/app/oracle/oradata/ncf/redo02a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo02b.log

alter database add logfile group 2 ('/u02/app/oracle/oradata/ncf/redo02a.log','/u02/app/oracle/oradata/ncf/redo02b.log') size 100m;

处理主库的standby log：

SQL> select group#,status from v$standby_log;

    GROUP# STATUS

---------- ----------

    10 UNASSIGNED

    11 UNASSIGNED

    12 UNASSIGNED

    13 UNASSIGNED

alter database drop logfile group 10;

alter database drop logfile group 11;

alter database drop logfile group 12;

alter database drop logfile group 13;

host rm -rf /u02/app/oracle/oradata/ncf/standby10a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby10b.log

host rm -rf /u02/app/oracle/oradata/ncf/standby11a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby11b.log

host rm -rf /u02/app/oracle/oradata/ncf/standby12a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby12b.log

host rm -rf /u02/app/oracle/oradata/ncf/standby13a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby13b.log

alter database add standby logfile group 10 ('/u02/app/oracle/oradata/ncf/standby10a.log','/u02/app/oracle/oradata/ncf/standby10b.log') size 100m;

alter database add standby logfile group 11 ('/u02/app/oracle/oradata/ncf/standby11a.log','/u02/app/oracle/oradata/ncf/standby11b.log') size 100m;

alter database add standby logfile group 12 ('/u02/app/oracle/oradata/ncf/standby12a.log','/u02/app/oracle/oradata/ncf/standby12b.log') size 100m;

alter database add standby logfile group 13 ('/u02/app/oracle/oradata/ncf/standby13a.log','/u02/app/oracle/oradata/ncf/standby13b.log') size 100m;

4、备库操作：

处理备库的redo log：

select l.group#,l.bytes/1024/1024 mb,lf.member from v$log l,v$logfile lf where l.group#=lf.group# order by group#;

    GROUP#       MB MEMBER

---------- ---------- --------------------------------------------------

     2      50 /u02/app/oracle/oradata/ncf/redo02a.log

     2      50 /u02/app/oracle/oradata/ncf/redo02b.log

     3      50 /u02/app/oracle/oradata/ncf/redo03a.log

     3      50 /u02/app/oracle/oradata/ncf/redo03b.log

     4      50 /u02/app/oracle/oradata/ncf/redo04a.log

     4      50 /u02/app/oracle/oradata/ncf/redo04b.log

select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

     2 CLEARING

     3 CURRENT

     4 CLEARING

alter database clear logfile group 4;

alter database drop logfile group 4;

host rm -rf /u02/app/oracle/oradata/ncf/redo04a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo04b.log

alter database add logfile group 4 ('/u02/app/oracle/oradata/ncf/redo04a.log','/u02/app/oracle/oradata/ncf/redo04b.log') size 100m;

alter database clear logfile group 2;

alter database drop logfile group 2;

host rm -rf /u02/app/oracle/oradata/ncf/redo02a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo02b.log

alter database add logfile group 2 ('/u02/app/oracle/oradata/ncf/redo02a.log','/u02/app/oracle/oradata/ncf/redo02b.log') size 100m;

针对current的日志，需要先在主库上切换日志，变为clearing再处理：

select group#,status from v$log;

    GROUP# STATUS

---------- ----------------

     2 CURRENT

     3 CLEARING

     4 UNUSED

alter database clear logfile group 3;

alter database drop logfile group 3;

host rm -rf /u02/app/oracle/oradata/ncf/redo03a.log

host rm -rf /u02/app/oracle/oradata/ncf/redo03b.log

alter database add logfile group 3 ('/u02/app/oracle/oradata/ncf/redo03a.log','/u02/app/oracle/oradata/ncf/redo03b.log') size 100m;

处理备库的standby log：

select sl.group#,sl.bytes/1024/1024 mb,lf.member from v$standby_log sl,v$logfile lf where sl.group#=lf.group# order by group#;

    GROUP#       MB MEMBER

---------- ---------- --------------------------------------------------

    10      50 /u02/app/oracle/oradata/ncf/standby10a.log

    10      50 /u02/app/oracle/oradata/ncf/standby10b.log

    11      50 /u02/app/oracle/oradata/ncf/standby11a.log

    11      50 /u02/app/oracle/oradata/ncf/standby11b.log

    12      50 /u02/app/oracle/oradata/ncf/standby12a.log

    12      50 /u02/app/oracle/oradata/ncf/standby12b.log

    13      50 /u02/app/oracle/oradata/ncf/standby13a.log

    13      50 /u02/app/oracle/oradata/ncf/standby13b.log

select group#,status from v$standby_log;

    GROUP# STATUS

---------- ----------

    10 ACTIVE

    11 UNASSIGNED

    12 UNASSIGNED

    13 UNASSIGNED

alter database drop logfile group 11;

alter database drop logfile group 12;

alter database drop logfile group 13;

host rm -rf /u02/app/oracle/oradata/ncf/standby11a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby11b.log

host rm -rf /u02/app/oracle/oradata/ncf/standby12a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby12b.log

host rm -rf /u02/app/oracle/oradata/ncf/standby13a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby13b.log

alter database add standby logfile group 11 ('/u02/app/oracle/oradata/ncf/standby11a.log','/u02/app/oracle/oradata/ncf/standby11b.log') size 100m;

alter database add standby logfile group 12 ('/u02/app/oracle/oradata/ncf/standby12a.log','/u02/app/oracle/oradata/ncf/standby12b.log') size 100m;

alter database add standby logfile group 13 ('/u02/app/oracle/oradata/ncf/standby13a.log','/u02/app/oracle/oradata/ncf/standby13b.log') size 100m;

针对active的日志，需要先在主库上切换日志再处理

SQL> select group#,status from v$standby_log;

    GROUP# STATUS

---------- ----------

    10 UNASSIGNED

    11 ACTIVE

    12 UNASSIGNED

    13 UNASSIGNED

alter database drop logfile group 10;

host rm -rf /u02/app/oracle/oradata/ncf/standby10a.log

host rm -rf /u02/app/oracle/oradata/ncf/standby10b.log

alter database add standby logfile group 10 ('/u02/app/oracle/oradata/ncf/standby10a.log','/u02/app/oracle/oradata/ncf/standby10b.log') size 100m;

5、在主库和备库设置standby_file_management为auto

alter system set standby_file_management='auto';

6、备库上启动同步：

alter database recover managed standby database using current logfile disconnect;

7、检查状态：

主库多次执行：alter system switch logfile;

主库：select max(sequence#) from v$archived_log;

备库：select max(sequence#) from v$archived_log where applied='YES';

     SELECT name,value,time_computed FROM V$DATAGUARD_STATS WHERE NAME like '%lag%';

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