GS_SESSION_MEMORY_CONTEXT

GS_SESSION_MEMORY_CONTEXT displays statistics on memory usage of all sessions based on the MemoryContext node. This view is valid only when enable_thread_pool is set to on.

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.

Table 1 GS_SESSION_MEMORY_CONTEXT columns

Name	Type	Description
sessid	text	Session start time + session ID (character string: timestamp.sessionid)
threadid	bigint	ID of the thread bound to a session (-1 if no thread is bound)
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.