Saturday, May 14, 2022

Low or Poor Buffer Cache Hit Ratio and Full Table Scans

 Normally DBAs do not much feel bothered by poor buffer cache hit ratio especially in data warehouse environments where full table scans may be quire frequent and acceptable. However, if you have OLTP environment, I still believe that buffer cache hit ratio should be taken care of and DBAs should try to keep it as high as they can. In OLTP environments, full table scans would cause cache hit ratio to be low because frequent full table scans of different tables would cause entire tables to be read in to buffer cache even if only a few block are needed for processing.

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