一套Oracle 12.2.0.1 4-nodes RAC on Linux 環境, 又一個BUG會生成大量的日志信息如下， 之前分享過一個生成大量trace的筆記
Oracle12c R2注意事項： 因BUG生成大量的trace file 包含KRB: (rman module), 這里記錄另一個bug.
# db alert log
2019-08-02T16:45:30.696722+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc: ORA-12805: parallel query server died unexpectedly 2019-08-02T16:45:52.826713+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc: ORA-12805: parallel query server died unexpectedly 2019-08-02T16:46:14.632368+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc: ORA-12805: parallel query server died unexpectedly 2019-08-02T16:46:53.042486+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc: ORA-12805: parallel query server died unexpectedly 2019-08-02T16:47:20.805880+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc: ORA-12805: parallel query server died unexpectedly 2019-08-02T16:47:43.007194+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc: ORA-12805: parallel query server died unexpectedly 2019-08-02T16:48:05.297383+08:00 Errors in file /u01/app/oracle/diag/rdbms/anbob/anbob1/trace/anbob1_cjq0_24035.trc:
Note:
大量的以上錯誤日志頻繁提示與cjq進程相關，並且cjq trace文件非常大。
解決方案：
屬於BUG 27579159，
1，臨時解決方法可以直接清理文件。
2， 升級到19c（19.1），
3， 安裝 one-off patch for
12.1.0.2
12.2.0.1 and 170718DBRU+
18.3DBUR, 18.5 DBRU+
問題二
另外在12c- 18c 之間有也是會也現ora-12805錯誤，當 ORA-12805, ORA-07445 [qertqistart] or ORA-600 [15803] 發生時，可能是因為bug 25694206. 下面的解決方法可以解決
SQL> alter system set "_px_wif_extend_distribution_keys"=false scope=both sid='*';
問題三
在12.2以后還可以出現下面的錯誤
# db alert log
opidcl aborting process unknown ospid (43364) as a result of ORA-12805 CLMN: delete dead process - succeeded
call stack:
ksesecl0 <- ksucin <- updrow <- qerusEvalUpdWhere <- qerusRop <- qerpxFetch <- qerusFetch <- updaul <- updThreePhaseExe <- upsexe
解決方法:
增長PQ運行的時間限制
SQL> alter system set max_idle_time=0 scope=both; SQL> alter system set max_idle_time=60 scope=both;
引用：
Oracle12c R2注意事項：ORA-12805問題 | ANBOB