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分类： Oracle
2006-12-31 15:26:05
1231-1 Size of the Database Buffer Cache
Note: The DB_nK_CACHE_SIZE parameters cannot be used to size the cache for the standard block size. If the value of DB_BLOCK_SIZE is nK, it is illegal to set DB_nK_CACHE_SIZE. The size of the cache for the standard block size is always determined from the value of DB_CACHE_SIZE.
（DB_nK_CACHE_SIZE参数不能为标准数据块，如果DB_BLOCK_SIZE是nk，那么设置DB_nK_CACHE_SIZE.是违法的。不太理解）
-2.Use the fixed view V$BUFFER_POOL to track the sizes of the different cache components and any pending resize operations.
（使用V$BUFFER_POOL视图查看不同的缓冲区尺寸和任何的未决的调整操作）
-3._ The KEEP buffer pool retains the schema object’s data blocks in memory.
_ The RECYCLE buffer pool eliminates data blocks from memory as soon as they are no longer needed.
_ The DEFAULT buffer pool contains data blocks from schema objects that are not assigned to any buffer pool, as well as schema objects that are explicitly assigned to the DEFAULT pool.
（KEEP buffer pool保留对象的数据块在内存。）
（RECYCLE buffer pool从内存中去除数据块一旦当他们不在使用时）
（The DEFAULT buffer pool包含哪些没有指派给任何buffer pool的数据块，也就是用户对象是明确的指派给默认缓冲池的）
Note: Multiple buffer pools are only available for the standard block size. Non-standard block size caches have a single DEFAULT pool.
（Multiple buffer pools仅适合标准数据块尺寸。非标准数据块尺寸的caches有单独的默认pool）
Redo Log Buffer
The initialization parameter LOG_BUFFER determines the size (in bytes) of the redo log buffer. In general, larger values reduce log file I/O, particularly if transactions are long or numerous. The default setting is either 512 kilobytes (KB) or 128 KB times the setting of the CPU_COUNT parameter, whichever is greater.
（初始化参数LOG_BUFFER定义了重做日志缓冲的尺寸。通常情况下，较大的值会降低日志文件的I/O，尤其是当长事务或较多的事务。默认设置或者512KB或者128KBCPU_COUNT参数次，无论何时是较大的）
SHARED_POOL_SIZE. The default value of this parameter is 8MB on 32-bit platforms and 64MB on 64-bit platforms.
（32位平台
