Performance tip of the day: set DB_FILE_MULTIBLOCK_READ_COUNT

Beginning with 10gR2, the default value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter is not 8 anymore. It is a platform-dependent value, and it is the amount of blocks that fit in 1MB for most platforms, so it will be likely around 128 if you’re using 8KB block size.

However, at least for OLTP databases, I and other fellow DBAs have seen performance improvements by setting this parameter to values near the old default of 8.

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