Updated on 2024-05-07 GMT+08:00

THREAD_WAIT_STATUS

THREAD_WAIT_STATUS allows you to test the block waiting status of the backend thread and auxiliary thread in the current instance. For details about events, see Table 2.

Table 1 THREAD_WAIT_STATUS columns

Name

Type

Description

node_name

text

Current node name

db_name

text

Database name

thread_name

text

Thread name

query_id

bigint

Query ID. The value of this column is the same as that of debug_query_id.

tid

bigint

Thread ID of the current thread

sessionid

bigint

Session ID

lwtid

integer

Lightweight thread ID of the current thread

psessionid

bigint

Parent thread of the streaming thread

tlevel

integer

Level of the streaming thread

smpid

integer

Concurrent thread ID

wait_status

text

Waiting status of the current thread. For details about the wait status, see Table 2.

wait_event

text

If wait_status is acquire lock, acquire lwlock, or wait io, this column describes the lock, lightweight lock, or I/O information. Otherwise, this column is empty.

locktag

text

Information about the lock that the current thread is waiting for

lockmode

text

Lock mode that the current thread is waiting to obtain. The values include table-level lock, row-level lock, and page-level lock modes.

block_sessionid

bigint

ID of the session that blocks the current thread from obtaining the lock

global_sessionid

text

Global session ID