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How is Parameter DB_FILE_MULTIBLOCK_READ_COUNT Calculated

edited Apr 27, 2015 10:01AM in Database Tuning (MOSC) 3 commentsAnswered


MBRC=MAX_IO_SIZE/DB_BLOCk_SIZE.

For 8i and above max_io_size min value is 1 MB for most of platforms and it may be higher. So if the block size is 8k then MBRC value should be set always 128?

How to calculate max_io_size on linux platform?

Since from 10g, it is automatically set depending on IO,number of sessions and size of buffer cache. I have unset the value on the database and after bounce the database the MBRC value bacame 20 from 32 whereas aio_max_nr is 1MB on server.

Thanks,

Amit

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