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

本站中文解释

V$PROCESS_MEMORY_DETAIL视图是Oracle数据库提供的一个动态性能视图，其中包含每个进程正在使用的内存相关信息。通过检查本视图，可以查看哪个进程正在使用多少可用内存，以及多少内存被释放。

使用V$PROCESS_MEMORY_DETAIL视图的主要用途是监控系统性能，如在特定操作期间总体内存使用情况等，以便根据实际情况增加或减少内存配置，以获得最佳性能。

使用方法：

1. 权限：V$PROCESS_MEMORY_DETAIL视图无需特殊权限，只需执行SELECT查询即可。

2. 查看：可以用下面的SQL语句查看V$PROCESS_MEMORY_DETAIL视图:

SELECT * FROM v$process_memory_detail;

3. 检测：可以使用以下查询来检测正在使用的内存和剩余内存：

SELECT pid, name, used_bytes, free_bytes FROM v$process_memory_detail ORDER BY used_bytes;

官方英文解释

V$PROCESS_MEMORY_DETAIL provides detailed information on dynamic PGA memory usage for each automatically captured snapshot.

Column Datatype Description

PID

NUMBER

Oracle process identifier

SERIAL#

NUMBER

Oracle process serial number

TIMESTAMP

DATE

Time at which the snapshot was taken

SQL_ID

VARCHAR2(13)

Identifier for the relevant SQL statement

TOTAL_MB

NUMBER

Total number of megabytes of PGA memory allocated at the time of the snapshot

CATEGORY

VARCHAR2(15)

Category name. Categories include:

  • SQL

  • PL/SQL

  • OLAP

  • JAVA

  • Freeable

  • Other

NAME

VARCHAR2(26)

PGA memory allocation comment. Small allocations may be grouped together with NAME set to Miscellaneous for performance reasons.

HEAP_NAME

VARCHAR2(15)

Name of heap or heaps (if same name) containing the allocations

BYTES

NUMBER

Bytes of PGA memory allocated in the process from heaps with the given heap name and with the given allocation comment

ALLOCATION_COUNT

NUMBER

Number of allocations with the comment found in the process inside heaps with the given heap name

HEAP_DESCRIPTOR

RAW(4 | 8)

If all the allocations are from one heap, then this is the address of the heap descriptor for that heap. Otherwise, this column is NULL.

PARENT_HEAP_DESCRIPTOR

RAW(4 | 8)

If all the allocations are from one heap, then this is the address of the parent heap descriptor for that heap. Otherwise, this column is NULL. If the heap has no parent, the value is zero.

MOST_RECENT

NUMBER

Oracle process identifier (PID) for most recent snapshot

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


数据运维技术 » Oracle 视图 V$PROCESS_MEMORY_DETAIL 官方解释，作用，如何使用详细说明
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