ORA-07445: Exception Encountered: Core Dump

I got “ORA-07445: Exception Encountered: Core Dump ” error in Oracle database.


ORA-07445: Exception Encountered: Core Dump


Details of error are as follows.

ORA-07445: exception encountered: core dump [kkqctJuxtaposeGBP()+674] [SIGSEGV] [ADDR:0x0] [PC:0xAFB9052] [Address not mapped to object] []

Error: ORA-07445 exception encountered: core dump

Cause : An operating system exception occurred which should result in the creation of a core file. This is an internal error.

Action : Contact Oracle Customer Support.



Exception Encountered: Core Dump

This ORA-07445 errors are related with the Inconsistency with the cost based query transformation due to the query which is not well structured. This error is caused because of Too small undo and temp segments, Program errors (outside of RAM ), Improper NLS parameter settings, Hardware errors, Oracle block corruption



To solve this error, you need to use next alternative workarounds:


    – OR –

  • Change the query.


_OPTIMIZER_COST_BASED_TRANSFORMATION controls whether or not the optimizer tries different transformations against a query using the cost with and without the transformations in order to determine if a transformation is useful or not.
The parameter can be set to any of: “exhaustive”, “iterative”, “linear”, “on”, “off” giving some control over how much effort is given to costing various transformations.

Cost based transformation can add a high overhead at parse time but can yield considerable benefits by way of a better plan for the statement.



Do you want to learn Oracle Database for Beginners, then read the following articles.

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )


About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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