The database buffer cache is the portion of the SGA that holds copies of data blocks
read from datafiles. All user processes concurrently connected to the instance share
access to the database buffer cache.
The database buffer cache and the shared SQL cache are logically segmented into
multiple sets. This organization into multiple sets reduces contention on
multiprocessor systems.
Database Buffer Cache : 保存从数据文件中读取的数据块 ， 用户进程可共享 。
逻辑的分为多个子段 ， 以便减少多用户之间的竞争
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10599713/viewspace-978168/ ，如需转载，请注明出处，否则将追究法律责任。
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