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

本站中文解释

Oracle 视图V$PX_PROCESS是数据库中基于Parallel Execution (PX)框架构建的一种视图,可以查看在视图中正在处理的PX进程以及其相关信息,如PX子程序类型、PX子程序状态以及活动时长等。此视图可以广泛应用于各种并行处理框架,用于精细管理、监控和诊断分析,以辅助对多处理器/多线程系统的性能和稳定性的优化。

使用Oracle视图V$PX_PROCESS有以下几种方法:

(1)查询PX进程:可以使用SELECT语句进行查询,如:SELECT * FROM V$PX_PROCESS;

(2)通过视图检测PX子程序状态:可以使用SELECT语句来检测PX子程序的执行状态,如:SELECT STATE FROM V$PX_PROCESS WHERE PID=;

(3)分析PX活动:可以使用SELECT语句来查询正在运行的PX线程的数量,如:SELECT count(*) FROM V$PX_PROCESS WHERE STATE=’ACTIVE’;

(4)查询PX活动时长:可以使用SELECT语句来查询PX线程的活动时长,如:SELECT ELAPSED_TIME FROM V$PX_PROCESS WHERE PID=;

官方英文解释

V$PX_PROCESS contains information about the sessions running parallel execution.

Column Datatype Description

SERVER_NAME

VARCHAR2(4)

The name of the PX server (P000, P001, and so on)

STATUS

VARCHAR2(9)

The state of the PX server (IN USE|AVAILABLE)

PID

NUMBER

The process identifier

SPID

VARCHAR2(24)

Operating system process ID

SID

NUMBER

The session ID of the PX server, if in use

SERIAL#

NUMBER

The session serial number of the PX server, if in use

IS_GV

VARCHAR2(5)

Indicates whether a slave process in parallel is a normal one or a GV$ process.

Possible values:

  • FALSE: The slave process in parallel is a normal process

  • TRUE: The slave process in parallel is a GV$ process

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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