DataGuard 備庫歸檔日志自動刪除配置

1. 如果沒有備份機制，想要實現備庫歸檔自動刪除，就需要使用快速恢復區(FRA)

  檢查當前備庫歸檔的存放位置：

SQL> show parameter log_archive_dest_1

NAME     TYPE    VALUE

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

log_archive_dest_1     string    location=/archdir valid_for=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=standby

2. 更改FRA配置

ALTER SYSTEM SET db_recovery_file_dest_size=60g SCOPE=BOTH;

ALTER SYSTEM SET db_recovery_file_dest=/archdir SCOPE=BOTH;

ALTER SYSTEM SET log_archive_dest_1='location=USE_DB_RECOVERY_FILE_DEST valid_for=(ALL_LOGFILES, ALL_ROLES) DB_UNIQUE_NAME=standby' SCOPE=BOTH;

3. 重啟備庫

ALTER DATABASE RECOVER  managed standby database cancel;

shutdown immediate

startup mount

ALTER DATABASE RECOVER  managed standby database disconnect from session;

此時alert里顯示新的archivelog存放到FRA里

 Media Recovery Log /archdir/STANDBY/archivelog/2017_07_13/o1_mf_2_265_dpgfvl3o_.arc

4. 配置rman的歸檔刪除策略

 CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY;

當FRA空間達到80%使用率時，就會自動刪除已經應用的archivelog： 

 Deleted Oracle managed file /archdir/STANDBY/archivelog/2017_07_18/o1_mf_2_412_dpvh6d5d_.arc