Oracle教程 2023-02-24

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

本站中文解释

_ALL

Oracle视图V$SQL_PLAN_STATISTICS_ALL是一个动态性能视图，它可以用来查看Oracle服务器中的单条SQL语句的执行计划，并收集统计信息。

该视图中的一些常见的字段如下：
1. SQL_TEXT：将执行的SQL到的字符串；
2. OTHER_XML：SQL语句的执行参数值；
3. COST：执行该行表达式需要的计算费用；
4. CARDINALITY：每一行表达式估计执行扫描行数；
5. BYTES：每一行表达式估计需要扫描字节数；
6. CPU_COST：每一行表达式估计的CPU费用；
7. IO_COST：每一行表达式估计的IO费用；
8. TIMESTAMP：最新的查询计划的时间戳。

要使用V$SQL_PLAN_STATISTICS_ALL视图，可以执行像下面这样的查询：

SELECT *
FROM V$SQL_PLAN_STATISTICS_ALL
WHERE sql_text LIKE ‘ SELECT %’;

官方英文解释

V$SQL_PLAN_STATISTICS provides execution statistics at the row source level for each child cursor.

Column	Datatype	Description
`ADDRESS`	`RAW(4 \| 8)`	Address of the handle to the parent for this cursor
`HASH_VALUE`	`NUMBER`	Hash value of the parent statement in the library cache. The two columns `ADDRESS` and `HASH_VALUE` can be used to join with `V$SQLAREA` to locate the parent cursor.
`SQL_ID`	`VARCHAR2(13)`	SQL identifier of the parent statement in the library cache
`PLAN_HASH_VALUE`	`NUMBER`	Numerical representation of the current SQL plan for this cursor. Comparing one `PLAN_HASH_VALUE` to another easily identifies whether or not two plans are the same (rather than comparing the two plans line by line)
`FULL_PLAN_HASH_VALUE`	`NUMBER`	Numeric representation of the complete SQL plan for this cursor. Comparing one `FULL_PLAN_HASH_VALUE` to another easily identifies whether or not two plans are the same (rather than comparing the two plans line by line). Note that the `FULL_PLAN_HASH_VALUE` cannot be compared across databases releases. It is not backward compatible.
`CHILD_ADDRESS`	`RAW(4 \| 8)`	Address of the child cursor
`CHILD_NUMBER`	`NUMBER`	Number of the child cursor that uses this work area. The columns `ADDRESS`, `HASH_VALUE`, and `CHILD_NUMBER` can be used to join with `V$SQL` to locate the child cursor using this area.
`OPERATION_ID`	`NUMBER`	A number assigned to each step in the execution plan
`EXECUTIONS`	`NUMBER`	Number of times this cursor has been executed
`LAST_STARTS`	`NUMBER`	Number of times this operation has been started, during the last execution
`STARTS`	`NUMBER`	Number of times this operation has been started, accumulated over the past executions
`LAST_OUTPUT_ROWS`	`NUMBER`	Number of rows produced by the row source, during the last execution
`OUTPUT_ROWS`	`NUMBER`	Number of rows produced by the row source, accumulated over the past executions
`LAST_CR_BUFFER_GETS`	`NUMBER`	Number of buffers retrieved in consistent mode, during the last execution. Buffers are usually retrieved in consistent mode for queries.
`CR_BUFFER_GETS`	`NUMBER`	Number of buffers retrieved in consistent mode, accumulated over the past executions. Buffers are usually retrieved in consistent mode for queries.
`LAST_CU_BUFFER_GETS`	`NUMBER`	Number of buffers retrieved in current mode, during the last execution. Buffers are retrieved in current mode for statements such as `INSERT`, `UPDATE`, and `DELETE`.
`CU_BUFFER_GETS`	`NUMBER`	Number of buffers retrieved in current mode, accumulated over the past executions. Buffers are retrieved in current mode for statements such as `INSERT`, `UPDATE`, and `DELETE`.
`LAST_DISK_READS`	`NUMBER`	Number of physical disk reads performed by the operation, during the last execution
`DISK_READS`	`NUMBER`	Number of physical disk reads performed by the operation, accumulated over the past executions
`LAST_DISK_WRITES`	`NUMBER`	Number of physical disk writes performed by the operation, during the last execution
`DISK_WRITES`	`NUMBER`	Number of physical disk writes performed by the operation, accumulated over the past executions
`LAST_ELAPSED_TIME`	`NUMBER`	Elapsed time (in microseconds) corresponding to this operation, during the last execution
`ELAPSED_TIME`	`NUMBER`	Elapsed time (in microseconds) corresponding to this operation, accumulated over the past executions
`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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