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PV_SESSION_MEMORY_DETAIL

Updated at:Jul 15, 2020 GMT+08:00

PV_SESSION_MEMORY_DETAIL displays statistics about thread memory usage by memory context.

The memory context TempSmallContextGroup collects information about all memory contexts whose value in the totalsize column is less than 8192 bytes in the current thread, and the number of the collected memory contexts is recorded in the usedsize column. Therefore, the totalsize and freesize columns for TempSmallContextGroup in the view display the corresponding information about all the memory contexts whose value in the totalsize column is less than 8192 bytes in the current thread, and the usedsize column displays the number of these memory contexts.

You can run the SELECT * FROM pv_session_memctx_detail (threadid,''); statement to record information about all memory contexts of a thread into the threadid_timestamp.log file in the /tmp/dumpmem directory. threadid can be obtained from the following table.

Table 1 PV_SESSION_MEMORY_DETAIL columns

Name

Type

Description

sessid

text

Thread start time+thread ID (string: timestamp.threadid)

sesstype

text

Thread name

contextname

text

Name of the memory context

level

smallint

Hierarchy of the memory context

parent

text

Name of the parent memory context

totalsize

bigint

Total size of the memory context, in bytes

freesize

bigint

Total size of released memory in the memory context, in bytes

usedsize

bigint

Size of used memory in the memory context, in bytes. For TempSmallContextGroup, this parameter specifies the number of collected memory contexts.

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