GS_SESSION_MEMORY_CONTEXT

GS_SESSION_MEMORY_CONTEXT displays the memory usage of all sessions based on the MemoryContext node. If the GUC parameter enable_memory_limit or enable_thread_pool is set to off, this view is unavailable.

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 and ID (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.

This view is an O&M view and is used to locate memory problems. Do not query this view concurrently. If you query this view concurrently, the waiting time for new connections increases as the number of concurrent connections increases. As a result, new connections cannot be connected for a long time.

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