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Redo log buffer and buffer cache sizing

I want to change my redo log buffer or database buffer cache size. Kindly tell me what the algorithm is to change the size.

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For the redo log buffer, if your database is experiencing a high degree of waits for space in the log buffer, consider increasing the size, but remember that it is almost never necessary for the size of a redo log buffer to exceed several hundred kilobytes.

For the buffer cache, make use of the buffer cache sizing advice embodied in the V$DB_CACHE_ADVICE data dictionary table, either via your own queries or the Enterprise Manager interface to this information. Each row in this view shows the estimated I/O activity for a given cache size; you can thus see how much more (or less) disk reads would be required for various cache sizes.

This was first published in May 2004

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