DG 日常管理命令汇总

1.启动/停止MRP进程

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 log_archive_dest 为LGWR时需要创建standby redolog,为arch时无须设置standby redolog
 --必须设置standby redolog，数据实时同步
 alter database recover managed standby database using current controlfile disconnect;
 --数据异步同步，当主库切换归档时进行数据同步
 alter database recover managed standby database disconnect from session;
 --关闭MRP进程
 alter database recover managed standby database cancel;

2.检查主备库状态

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 select OPEN_MODE,PROTECTION_MODE,ACTIVATION#,DATABASE_ROLE,SWITCHOVER#,SWITCHOVER_STATUS FROM V$DATABASE;
 确认主库状态为to standby或者为sessions active、保护模式应该maximum performance、角色为PRIMARY
 在备库查询时通常为not allowed 或者sessions active，角色为PHYSICAL STANDBY

3.检查数据同步情况

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 -查看应用日志延迟时间：
 select value from v$dataguard_stats where name='apply lag';
 -查看接收日志延迟时间：
 select value from v$dataguard_stats where name='transport lag';
 -查看主库归档
 Primary: SQL> select thread#, max(sequence#) "Last Primary Seq Generated"
 from v$archived_log val, v$database vdb
 where val.resetlogs_change# = vdb.resetlogs_change#
 group by thread# order by 1;
 -查看备库已接收归档
 PhyStdby:SQL> select thread#, max(sequence#) "Last Standby Seq Received"
 from v$archived_log val, v$database vdb
 where val.resetlogs_change# = vdb.resetlogs_change#
 group by thread# order by 1;
 -查看备库已应用归档
 PhyStdby:SQL>select thread#, max(sequence#) "Last Standby Seq Applied"
 from v$archived_log val, v$database vdb
 where val.resetlogs_change# = vdb.resetlogs_change#
 and val.applied in ('YES','IN-MEMORY')
 group by thread# order by 1;
 -查看归档应用详细情况
 select first_time,sequence#,applied from v$archived_log;
 -查看主备库GAP
 select * from v$archive_gap;

4.查询ASM Diskgroup 使用率

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 SET LINES 300 PAGES 9999
 COL name FOR a15
 COL USED_PERCENT FOR a15
 SELECT GROUP_NUMBER,
 NAME,
 TOTAL_MB / 1024 total_gb,
 FREE_MB / 1024,
 USABLE_FILE_MB / 1024,
 ROUND ( (TOTAL_MB - USABLE_FILE_MB) * 100 / TOTAL_MB) || '%'
 USED_PERCENT
 FROM V$ASM_DISKGROUP
 ORDER BY 1;

5.检查进程

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 主库(确认ARCH进程正常)
 SQL> SELECT PROCESS, CLIENT_PROCESS, SEQUENCE#, STATUS FROM V$MANAGED_STANDBY;
 PROCESS CLIENT_PROCESS SEQUENCE# STATUS
 ------------------ ---------------- ---------- ------------------------
 ARCH ARCH 731 CLOSING
 DGRD N/A 0 ALLOCATED
 DGRD N/A 0 ALLOCATED
 ARCH ARCH 732 CLOSING
 ARCH ARCH 733 CLOSING
 ARCH ARCH 734 CLOSING
 LNS LNS 735 WRITING
 DGRD N/A 0 ALLOCATED
 DGRD N/A 0 ALLOCATED

 备库(要确认存在MRP、ARCH、RFS进程)
 SQL> SELECT PROCESS, CLIENT_PROCESS, SEQUENCE#, STATUS FROM V$MANAGED_STANDBY;
 PROCESS CLIENT_PROCESS SEQUENCE# STATUS
 ------------------ ---------------- ---------- ------------------------
 ARCH ARCH 735 CLOSING
 DGRD N/A 0 ALLOCATED
 DGRD N/A 0 ALLOCATED
 ARCH ARCH 731 CLOSING
 ARCH ARCH 693 CLOSING
 ARCH ARCH 692 CLOSING
 RFS LGWR 736 IDLE
 RFS UNKNOWN 0 IDLE
 RFS UNKNOWN 0 IDLE
 RFS Archival 0 IDLE
 RFS LGWR 694 IDLE
 PROCESS CLIENT_PROCESS SEQUENCE# STATUS
 ------------------ ---------------- ---------- ------------------------
 MRP0 N/A 736 APPLYING_LOG
 RFS UNKNOWN 0 IDLE
 RFS Archival 0 IDLE

6.查询，添加standby log

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 select GROUP#, DBID db_id, THREAD#, SEQUENCE#, BYTES, USED, ARCHIVED, STATUS, FIRST_CHANGE#, NEXT_CHANGE#,LAST_CHANGE# from v$standby_log ;
 alter database add standby logfile thread 1 group 7 size xxx ,group 8 size xxx ,group 9 size xxx,group 10 size xxx ;

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