GS_THREAD_MEMORY_CONTEXT

GS_THREAD_MEMORY_CONTEXT displays statistics about memory usage of all threads based on MemoryContext nodes. This view is equivalent to the GS_SESSION_MEMORY_CONTEXT view when enable_thread_pool is set to off. If the GUC parameter enable_memory_limit 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_THREAD_MEMORY_CONTEXT columns

Name	Type	Description
threadid	text	Thread start time + thread ID (string: timestamp.tsessionid)
tid	bigint	Thread ID
thrdtype	text	Thread type
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 current 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.