並行程式出現ORA-27090錯誤

客戶的RAC資料庫出現ORA-27090錯誤。

詳細的錯誤資訊如下：

Wed May  2 22:13:14 2012
Completed instance recovery at
 Thread 1: logseq 22430, block 190818, scn 5430629987
 4110 data blocks read, 4503 data blocks written, 43017 redo blocks read
Wed May  2 22:13:15 2012
Thread 1 advanced to log sequence 22431 (thread recovery)
Wed May  2 22:13:16 2012
Errors in file /u01/app/oracle/admin/orcl/bdump/orcl2_p007_15968.trc:
ORA-27090: Message 27090 not found;  product=RDBMS; facility=ORA
Linux-x86_64 Error: 4: Interrupted system call
Additional information: 3
Additional information: 128
Additional information: 65536
Wed May  2 22:13:16 2012
Errors in file /u01/app/oracle/admin/orcl/bdump/orcl2_p008_15970.trc:
ORA-27090: Message 27090 not found;  product=RDBMS; facility=ORA
Linux-x86_64 Error: 4: Interrupted system call
Additional information: 3
Additional information: 128
Additional information: 65536
Wed May  2 22:13:16 2012
Errors in file /u01/app/oracle/admin/orcl/bdump/orcl2_p004_15962.trc:
ORA-27090: Message 27090 not found;  product=RDBMS; facility=ORA
Linux-x86_64 Error: 4: Interrupted system call
Additional information: 3
Additional information: 128
Additional information: 65536
.
.
.
Wed May  2 22:13:16 2012
Errors in file /u01/app/oracle/admin/orcl/bdump/orcl2_p014_15995.trc:
ORA-27090: Message 27090 not found;  product=RDBMS; facility=ORA
Linux-x86_64 Error: 4: Interrupted system call
Additional information: 3
Additional information: 128
Additional information: 65536
Wed May  2 22:13:29 2012
SMON: Parallel transaction recovery tried

問題發生在RAC一個節點崩潰後，所有的錯誤都發生在並行程式PNNN上。檢視了一下MOS，發現這個問題是由於系統引數配置不當所致：ORA-27090: MESSAGE 27090 NOT FOUND; [ID 579108.1]。

核心引數的值：aio-max-nr設定太低，推薦設定為fs.aio-max-nr= 3145728。修改引數使用sysctl –p重新載入引數後，重啟資料庫即可。