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Don Burleson Blog 








Tips for using the COMPATIBLE parameter

Oracle Database Tips by Donald BurlesonNovember 17, 2015


Question:  How many digits are important when setting compatible init parameter? What is the difference between setting it to 10.2.0, and

Are all of the digits in the compatible parameter important?

Can I keep compatible set to 10.2.0 for all releases of 10gR2?

Answer:  Yes, the number of digits is meaningful, and many shops use less digits to make distributed communications easy between instances on different sub releases using compatible=10.2

Failure to standardize the compatible parameter can precipitate the following error:

ORA-23375: feature is incompatible with database version

You should set the compatible parameter to the version of Oracle that you are using in order to use all replication features of that version of the database. 

Here is the mapping for the compatible parameter digits:

Oracle Database Release Default Value Minimum Value Maximum Value
Oracle8i release 8.1.7 8.0.0 8.1.7.x.x
Oracle9i release 9.0.1 8.1.0 9.0.1.x.x
Oracle9i release 9.2 8.1.0 9.2.0.x.x
Oracle Database 10g release 10.1 10.0.0 10.1.0.x.x
Oracle Database 10g release 10.2 10.2.0 10.2.0.x.x
Oracle 11g Release 11.1 11.0.0 11.1.0.x.x
Oracle 11g Release 11.2 11.0.0 11.2.0.x.x

Related compatible parameter notes

  • The compatible parameter must be reset for an Oracle downgrade.
  • The compatible parameter must be set to at least 8.0.0 to get parallel DML.
  • To see the existing format of your compatible parameter, enter:

Select name,value
from v$parameter
where name like 'comp%';


If you like Oracle tuning, you might enjoy my book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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