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Day by day in new version of Oracle we found hidden parameters are being increased.Oracle 10g (10.2.0.4) is having 1237 hidden parameters. Double under score parameters are introduced in Oracle 10g hidden parameters. Above counting is including of double underscore hidden parameters also.
Hidden parameters are called undocumented parameters of Oracle and it is not easy to change those parameters. Because Oracle doesn’t take any kind of guarantee for database stability (if changed without getting advice from Oracle Support).
It is not advisable to change hidden parameters of the Oracle database for DBAs without the instruction of Oracle Support.
You can find out all list of hidden parameters of Oracle 10g Database with description and default value from following link.
File name: Oracle 10g hidden parameters
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