What is the Oracle 11g buffer cache?
Date:2023-01-07
The Oracle 11g buffer cache is a memory structure that stores recently used copies of database blocks that have been read from datafiles within the SGA (System Global Area). It is used to reduce physical I/O operations, which are a major bottleneck in database performance. When a query requires data, the buffer cache is consulted first. If the requested data is already in the cache, then it can be returned quickly. If not, the data is read from disk and kept in the buffer cache for faster retrieval the next time it is requested.
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