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Buffer Cache
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是sga的一部分，用于保持从数据文件读取数据块的副本。所有用户进程共同访问database buffer cache。
数据库的读写操作应尽量在内存中完成，减少I ...