Oracle教程 2023-03-22

Oracle 视图 V$MEMOPTIMIZE_WRITE_AREA 官方解释，作用，如何使用详细说明

Oracle视图V$MEMOPTIMIZE_WRITE_AREA用来查看系统参数MEMOPTIMIZE_WRITE区域的信息。它通常用于优化磁盘I/O。

MEMOPTIMIZE_WRITE用于指定允许将未提交的改变写回磁盘的组合写缓冲区的最大大小，以及将多少次更改写入文件中的最大大小。这两个参数的值影响数据库的I/O性能和吞吐量。

使用V$MEMOPTIMIZE_WRITE_AREA可以查看系统对该参数的使用情况。可以使用它来查看当前绑定到每个实例的MEMOPTIMIZE_WRITE的大小，以及哪个部分在MEMOPTIMIZE_WRITE中未使用。

V$MEMOPTIMIZE_WRITE_AREA displays information about fast ingest data in the large pool.

Column	Datatype	Description
`TOTAL_SIZE`	`NUMBER`	Total amount of memory allocated for fast ingest data in the large pool (in bytes)
`USED_SPACE`	`NUMBER`	Total amount of memory currently used by fast ingest data in the large pool (in bytes)
`FREE_SPACE`	`NUMBER`	Total amount of memory currently free for storing fast ingest data in the large pool (in bytes)
`NUM_WRITES`	`NUMBER`	Number of fast ingest insert operations for which data is still in the large pool and is yet to be written to disk
`NUM_WRITERS`	`NUMBER`	Number of clients currently using fast ingest for inserting data into the database
`CON_ID`	`NUMBER`	The ID of the container to which the data pertains. Possible values include: `0`: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. `1`: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data

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