Database will come up with hidden buffer pools

18 June,2012 by Jack Vamvas

Question: I get these buffer pool messages in the db2diag.log  as sever status. How can I fix?

 Database will come up with hidden buffer pools

Answer:    When a server has insufficient addressable memory space left and the main buffer pools are to large the DB2 database will not start.

 As it won’t start , the DBA cannot connect to the database and change the buffer pool sizes. In that situation, the DB2 database will start with the pre-allocated four small buffer pools.

Querying buffer pools - "SELECT * FROM SYSCAT.BUFFERPOOLS” will not allow you to view the hidden bufferpools.

To view the hidden bufferepools

db2pd -db dbname -bufferpools



 Once the database is   started with the four small buffer pools , connect to the database and decrease the size of the main buffer pools or add more memory to all the main bufferpools to initiate

Author: Jack Vamvas(


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