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有客户遇到ORA-2289的报错，同事协助去现场排查，我帮着远程共同check下。客户只是应用端报出的错误，为了进一步定位，服务端需要开errorstack协助定位具体问题。下面就以这个ORA-2289为例，示范下errorstack的使用方法。
--开启errorstackalter system set events "2289 trace name errorstack level 3";--关闭errorstackalter system set events "2289 trace name errorstack off";开启errorstack期间，模拟一个会话发生了ORA-02289的报错：
[oracle@bogon trace]$ sqlplus / as sysdbaSQL*Plus: Release 19.0.0.0.0 - Production on Wed Apr 26 22:00:21 2023Version 19.16.0.0.0Copyright (c) 1982, 2022, Oracle. All rights reserved.Connected to:Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - ProductionVersion 19.16.0.0.0SQL> select s2.nextval from dual;select s2.nextval from dual *ERROR at line 1:ORA-02289: sequence does not existSQL> exit在alert告警日志可以看到提示：
2023-04-26T22:00:27.300427+08:00Errors in file /u01/app/oracle/diag/rdbms/demo/demo/trace/demo_ora_3435.trc:ORA-02289: sequence does not exist进而在trc文件中进一步查询具体报错的SQL信息等：
[oracle@bogon trace]$ vi demo_ora_3435.trc ... 17 *** 2023-04-26T22:00:27.300081+08:00 (CDB$ROOT(1)) 18 *** SESSION ID:(2548.56891) 2023-04-26T22:00:27.300150+08:00 19 *** CLIENT ID:() 2023-04-26T22:00:27.300158+08:00 20 *** SERVICE NAME:(SYS$USERS) 2023-04-26T22:00:27.300164+08:00 21 *** MODULE NAME:(sqlplus@bogon (TNS V1-V3)) 2023-04-26T22:00:27.300170+08:00 22 *** ACTION NAME:() 2023-04-26T22:00:27.300177+08:00 23 *** CLIENT DRIVER:(SQL*PLUS) 2023-04-26T22:00:27.300182+08:00 24 *** CONTAINER ID:(1) 2023-04-26T22:00:27.300189+08:00 25 26 dbkedDefDump(): Starting a non-incident diagnostic dump (flags=0x0, level=3, mask=0x0) 27 ----- Error Stack Dump ----- 28 at 0x7ffed8393280 placed dbkda.c@298 29 ORA-02289: sequence does not exist 30 ----- Current SQL Statement for this session (sql_id=c6bu1kcbt5z3f) ----- 31 select s2.nextval from dual 32 33 ----- Call Stack Trace ----- 34 calling call entry argument values in hex 35 location type point (? means dubious value) 36 -------------------- -------- -------------------- ---------------------------- 37 ksedst1()+95 call kgdsdst() 7FFED83926E0 000000002... 我这里模拟是直接查询了不存在的序列，但是报这个错误其实未必是数据库问题，可以在MOS多搜索下相关案例，也有程序配置问题导致的情况。
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