|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 going 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. You should set
true if the performance overhead is acceptable.