Oracle8i Reference
Release 2 (8.1.6)

A76961-01

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Initialization Parameters, 29 of 188


DB_BLOCK_CHECKING

Parameter type: 

Boolean 

Parameter class: 

Dynamic. Scope = ALTER SESSION, ALTER SYSTEM ... DEFERRED. 

Default value: 

FALSE 

Range of values: 

TRUE | FALSE 

DB_BLOCK_CHECKING controls whether Oracle performs block checking for data blocks. When this parameter is set to TRUE, Oracle performs block checking for all data blocks. When it is set to FALSE, Oracle does not perform block checking for blocks in the user tablespaces. However, block checking for the SYSTEM tablespace is always turned on.

Oracle checks a block by walking through the data on the block, making sure it is self-consistent. Block checking can often prevent memory and data corruption. Block checking typically causes 1% to 10% overhead, depending on workload. The more updates or inserts in a workload, the more expensive it is to turn on block checking. Oracle recommends that you set DB_BLOCK_CHECKING to TRUE if the performance overhead is acceptable. 


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