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Oracle® Database Reference
11g Release 2 (11.2)

Part Number E17110-04
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DB_BLOCK_BUFFERS

Property Description
Parameter type Integer
Default value 0
Modifiable No
Range of values 50 to an operating system-specific maximum
Basic No
Oracle RAC Multiple instances can have different values, and you can change the values as needed.

Note:

DB_BLOCK_BUFFERS cannot be combined with the dynamic DB_CACHE_SIZE parameter; combining these parameters in the same parameter file will produce an error.

DB_BLOCK_BUFFERS specifies the number of database buffers in the buffer cache. It is one of several parameters that contribute to the total memory requirements of the SGA of an instance.

This parameter, together with DB_BLOCK_SIZE, determines the total size of the buffer cache. Effective use of the buffer cache can greatly reduce the I/O load on the database. DB_BLOCK_SIZE can be specified only when the database is first created, so you use DB_BLOCK_BUFFERS to control the size of the buffer cache.