今天想測試點東西，登錄測試庫；發現實例是關閉的；
SQL> startup
ORACLE instance started.
Total System Global Area 2722467840 bytes
Fixed Size 2231472 bytes
Variable Size 1476395856 bytes
Database Buffers 1241513984 bytes
Redo Buffers 2326528 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 23281
Session ID: 1 Serial number: 5
查看日誌
SUCCESS: diskgroup ORAARCH was mounted
ARCH: Error 19504 Creating archive log file to '+ORAARCH'
Errors in file /u01/app/oracle/diag/rdbms/xhdb/xhdb1/trace/xhdb1_ora_23565.trc:
ORA-16038: log 5 sequence# 345 cannot be archived
ORA-19504: failed to create file ""
ORA-00312: online log 5 thread 1: '+ORADATA/xhdb/onlinelog/group_5.272.857422319 '
USER (ospid: 23565): terminating the instance due to error 16038
System state dump requested by (instance=1, osid=23565), summary=[abnormal insta nce termination].
System State dumped to trace file /u01/app/oracle/diag/rdbms/xhdb/xhdb1/trace/xh db1_diag_23451.trc
Dumping diagnostic data in directory=[cdmp_20141218102056], requested by (instan ce=1, osid=23565), summary=[abnormal instance termination].
Instance terminated by USER, pid = 23565
查看(fdisk)查看磁盤都在；切換到grid集羣也在運行，asm磁盤組都在；可能是歸檔空間不夠了；把節點1的數據庫實例啓動到掛載狀態下；
SQL> startup mount;
ORACLE instance started.
Total System Global Area 2722467840 bytes
Fixed Size 2231472 bytes
Variable Size 1476395856 bytes
Database Buffers 1241513984 bytes
Redo Buffers 2326528 bytes
Database mounted.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination +ORAARCH
Oldest online log sequence 345
Next log sequence to archive 345
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ ------------------------------ ----------- ---------- ----------
1 CRS MOUNTED 998 600
2 ORAARCH MOUNTED 8189 11
3 ORADATA CONNECTED 20473 16198
發現是oraarch 歸檔空間不夠了,節點1登錄rman,把歸檔日誌刪除；在節點1和節點2啓動數據庫實例，正常；
RMAN> crosscheck archivelog all;
RMAN> delete archivelog all;
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ ------------------------------ ----------- ---------- ----------
1 CRS MOUNTED 998 600
2 ORAARCH CONNECTED 8189 5123
3 ORADATA CONNECTED 20473 16198
SQL> alter database open;
Database altered.
節點2 也能正常打開
[oracle@rac2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Thu Dec 18 10:56:54 2014
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 2722467840 bytes
Fixed Size 2231472 bytes
Variable Size 1191183184 bytes
Database Buffers 1526726656 bytes
Redo Buffers 2326528 bytes
Database mounted.
Database opened.