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Oracle9i Database Reference
Release 2 (9.2)

Part Number A96536-02
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Parameter type


Default value


Parameter class


Range of values

2048 to 32768, but your operating system may have a narrower range

Real Application Clusters

You must set this parameter for every instance, and multiple instances must have the same value.


Set this parameter at the time of database creation. Do not alter it afterward.

DB_BLOCK_SIZE specifies the size (in bytes) of Oracle database blocks. Typical values are 2048 and 4096. The value for DB_BLOCK_SIZE in effect at the time you create the database determines the size of the blocks. The value must remain set to its initial value.

If you are using Oracle9i Real Application Clusters, then this parameter affects the maximum value of the FREELISTS storage parameter for tables and indexes. Oracle uses one database block for each freelist group. Decision support system (DSS) and data warehouse database environments tend to benefit from larger block size values.

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