Why is there a setting duplicate when I create a file pfile from spfile on a DB of RAC?

Hello world

I ran ORACHK on a 11g (11.2.0.4) database RAC and one of the results shows "check no input parameter in the init.ora (spfile) database duplicate" that I generated a pfile from two of the database file and the following repeated, I saw:

(BD1)

amagua2.__streams_pool_size = 536870912

amagua1.__streams_pool_size = 536870912

amagua2.__streams_pool_size = 536870912

amagua1.__streams_pool_size = 536870912

(BD2)

* .db_16k_cache_size = 1610612736

METRO1.db_16k_cache_size = 2147483648

METRO2.db_16k_cache_size = 2147483648

I don't know why this happens, in BD2 when I select the setting of $ v that I see the greatest value, which was the last one I assigned to the parameter, so I don't know why the lower value appears in my file pfile.

in BD1 two lines appear just a copy with the same value.

I would fix this, any help will be appreciated.

Thanks in advance.

Giancarlo Giammaria

(BD1)

amagua2.__streams_pool_size = 536870912

amagua1.__streams_pool_size = 536870912

amagua2.__streams_pool_size = 536870912

amagua1.__streams_pool_size = 536870912

This is because Oracle manages the size of the SGA on its own. Either you MEMORY_TARGET or SGA_TARGET value. Oracle wrote its flow Pool size in the SPFILE so that when the instance is started, it can resume with that component SGA size to its last known value, based on the workload of your application. It is curious to see the two sets, and I have no idea why. But you can always delete the duplicate entries and re-create the SPFILE.

(BD2)

* .db_16k_cache_size = 1610612736

METRO1.db_16k_cache_size = 2147483648

METRO2.db_16k_cache_size = 2147483648

In the case above, you have a set specifically for the METRO1 instance. And another parameter specifically for instance METRO2. The higher setting is global for all cases, unless the instance-specific setting would be substitute one world. If you have only two instances, then the global is not much until you add a third instance.

Now for Oracle RAC... it is normally a good idea to have all the instances with the same cache size setting. It is rare that there is a good reason for instance1 to have a different value than instance2. In addition, if you use TAF and/or want a second instance to support connections over the failover of the first instance, then you want your LMS components sized so as to be able to manage not only the current work load, but the additional workload due to the failure of the instance.

See you soon,.
Brian

Tags: Database

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