Setting the Buffer Cache Initialization Parameters (108)

最新推荐文章于 2025-12-15 21:10:21 发布

转载最新推荐文章于 2025-12-15 21:10:21 发布 · 106 阅读

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#数据库

本文介绍了Oracle数据库中缓冲区缓存初始化参数的作用及其如何影响性能。这些参数用于指定数据库使用不同块大小时缓存的大小，是动态调整的。合理设置可以减少磁盘I/O操作，但过大的缓存可能导致内存分页或交换。

The buffer cache initialization parameters
determine the size of the buffer cache component of the SGA. You use them to specify
the sizes of caches for the various block sizes used by the database. These initialization
parameters are all dynamic.

If you intend to use multiple block sizes in your database, you must have the
DB_CACHE_SIZE and at least one DB_nK_CACHE_SIZE parameter set. Oracle
Database assigns an appropriate default value to the DB_CACHE_SIZE parameter, but
the DB_nK_CACHE_SIZE parameters default to 0, and no additional block size caches
are configured.

The size of a buffer cache affects performance. Larger cache sizes generally reduce the
number of disk reads and writes. However, a large cache may take up too much
memory and induce memory paging or swapping.

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