增加联机重做日志组
要增加联机重做日志组的数量，通过“alter database add logfile group…”语句实现。
具体如下：
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SQL> desc v$logfile; Name Null? Type ----------------------------------------- -------- ---------------------------- GROUP# NUMBER STATUS VARCHAR2(7) TYPE VARCHAR2(7) MEMBER VARCHAR2(513) IS_RECOVERY_DEST_FILE VARCHAR2(3) CON_ID NUMBER SQL> SQL> set linesize 400 SQL> set pagesize 400 SQL> SQL> col member for a68 SQL> SQL> select * from v$logfile; GROUP# STATUS TYPE MEMBER IS_ CON_ID ---------- ------- ------- -------------------------------------------------------------------- --- ---------- 1 ONLINE /oradata/ATLAS/onlinelog/o1_mf_1_b5cyjr0s_.log NO 0 1 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/o1_mf_1_b5cyjrgf_.log YES 0 2 ONLINE /oradata/ATLAS/onlinelog/o1_mf_2_b5cyjs6t_.log NO 0 2 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/o1_mf_2_b5cyjsoj_.log YES 0 3 ONLINE /oradata/ATLAS/onlinelog/o1_mf_3_b5cyjt8v_.log NO 0 3 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/o1_mf_3_b5cyjvkg_.log YES 0 6 rows selected. SQL> SQL> alter database add logfile group 4 ('/oradata/ATLAS/onlinelog/redo04a.log','/oradata/fast_recovery_area/ATLAS/onlinelog/redo04b.log') size 50m; Database altered. SQL> select * from v$logfile; GROUP# STATUS TYPE MEMBER IS_ CON_ID ---------- ------- ------- -------------------------------------------------------------------- --- ---------- 1 ONLINE /oradata/ATLAS/onlinelog/o1_mf_1_b5cyjr0s_.log NO 0 1 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/o1_mf_1_b5cyjrgf_.log YES 0 2 ONLINE /oradata/ATLAS/onlinelog/o1_mf_2_b5cyjs6t_.log NO 0 2 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/o1_mf_2_b5cyjsoj_.log YES 0 3 ONLINE /oradata/ATLAS/onlinelog/o1_mf_3_b5cyjt8v_.log NO 0 3 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/o1_mf_3_b5cyjvkg_.log YES 0 4 ONLINE /oradata/ATLAS/onlinelog/redo04a.log NO 0 4 ONLINE /oradata/fast_recovery_area/ATLAS/onlinelog/redo04b.log NO 0 8 rows selected. SQL> |
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