这篇文章主要介绍Oracle如何创建新undo表空间，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

在处理一则ORA-600 [4194]案例时，参考MOS文档：Step by step to resolve ORA-600 4194 4193 4197 on database crash (文档 ID 1428786.1)

1.对于ORA 600[4194]的解释

2.创建新undo表空间最佳实践(包含段检查)

1.对于ORA 600[4194]的解释：

The following error is occurring in the alert.log right before the database crashes.
ORA-00600: internal error code, arguments: [4194], [#], [#], [], [], [], [], []
This error indicates that a mismatch has been detected between redo records and rollback (undo) records.
ARGUMENTS:
Arg [a] - Maximum Undo record number in Undo block
Arg [b] - Undo record number from Redo block
Since we are adding a new undo record to our undo block, we would expect that the new record number is equal to the maximum record number in the undo block plus one. Before Oracle can add a new undo record to the undo block it validates that this is correct. If this validation fails, then an ORA-600 [4194] will be triggered.

可以看到，此错误是因为redo和undo的记录不匹配。常见于异常断电等场景。

2.创建新undo表空间最佳实践(包含段检查)

Bestpracticetocreateanewundotablespace.hismethodincludessegmentcheck.CreatepfilefromspfiletoeditSQL>Createpfile='/tmp/initsid.ora'fromspfile;Shutdowntheinstancesetthefollowingparametersinthepfile/tmp/initsid.oraundo_management=manualevent='10513tracenamecontextforever,level2'SQL>>startuprestrictpfile='/tmp/initsid.ora'SQL>selecttablespace_name,status,segment_namefromdba_rollback_segswherestatus!='OFFLINE';Thisiscritical-wearelookingforallundosegmentstobeoffline-Systemwillalwaysbeonline.Ifanyare'PARTLYAVAILABLE'or'NEEDSRECOVERY'-PleaseopenanissuewithOracleSupportorupdatethecurrentSR.TherearemanyoptionsfromthismomentandOracleSupportAnalystcanofferdifferentsolutionsforthebadundosegments.IfallofflinethencontinuetothenextstepCreatenewundotablespace-exampleSQL>createundotablespace<newundotablespace>datafile<datafile>size2000M;DropoldundotablespaceSQL>droptablespace<oldundotablespace>includingcontentsanddatafiles;SQL>shutdownimmediate;SQL>startupnomount;-->UsingyourOriginalspfile.ModifythespfilewiththenewundotablespacenameSQL>Altersystemsetundo_tablespace='<newtablespacecreatedinstep6>'scope=spfile;.SQL>shutdownimmediate;.SQL>startup;-->Usingspfile

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