ORA-600 [kttbsz_1] / ORA-600  Errors After Instance Startup (Doc ID 550448.1)
Last updated on JUNE 13, 2013
Oracle Server - Enterprise Edition - Version: 18.104.22.168 to 10.1.0.5
This problem can occur on any platform.
You encounter ORA-600 [kttbsz_1] and/or ORA-600  errors after startup on queries which have previously worked without error.
Checking the alert log you notice that an ORA-600 [ktsitbs_info1] error was raised during the instance startup after performing a space layer transaction, such as backing up the control file, however the instance startup completed and the database is accessible to users.
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