GS_ASP

GS_ASP displays the persistent ACTIVE SESSION PROFILE samples. This system catalog can be queried only in the system library.

**Table 1** GS_ASP columns
Name	Type	Description
sampleid	bigint	Sample ID
sample_time	timestamp with time zone	Sampling time
need_flush_sample	Boolean	Specifies whether the sample needs to be flushed to disks. t (true): yes f (false): no
databaseid	oid	Database ID
thread_id	bigint	Thread ID
sessionid	bigint	Session ID
start_time	timestamp with time zone	Start time of a session
event	text	Event name. For details about key events in the kernel, see Table 2, Table 3, Table 4, and Table 5. For details about the impact of each transaction lock on services, see LOCK.
lwtid	integer	Lightweight thread ID of the current thread
psessionid	bigint	Parent thread of the streaming thread
tlevel	integer	Level of the streaming thread The value corresponds to the level (ID) of the execution plan.
smpid	integer	Concurrent thread ID in SMP execution mode
userid	oid	ID of a session user
application_name	text	Name of an application
client_addr	inet	IP address of a client
client_hostname	text	Name of a client
client_port	integer	TCP port number used by a client to communicate with the backend
query_id	bigint	Debug query ID
unique_query_id	bigint	Unique query ID
user_id	oid	User ID in the key of the unique query
cn_id	integer	CN from which the unique SQL statement comes. cn_id is in the key of the unique query.
unique_query	text	Standardized unique SQL text string
locktag	text	Information of a lock that the session waits for, which can be parsed using locktag_decode
lockmode	text	Mode of a lock that the session waits for LW_EXCLUSIVE: exclusive lock LW_SHARED: shared lock LW_WAIT_UNTIL_FREE: waits for LW_EXCLUSIVE to be available
block_sessionid	bigint	Blocks a session from obtaining the session ID of a lock if the session is waiting for the lock.
wait_status	text	Provides more details about an event column.
global_sessionid	text	Global session ID. The structure is nodeid:sessionid#seqid. nodeid: ID of the delivery node. sessionid: session ID of the delivery node. sequd: sequence number in ascending order. The ID is 0 on the delivery node. The nodeid and sessionid values of this column are the same for sessions delivered to other nodes in the same session.
xact_start_time	timestamp with time zone	Start time of the transaction
query_start_time	timestamp with time zone	Time when the statement starts to be executed
state	text	Current statement state. The options are as follows: active: The backend is executing a query. idle in transaction: The backend is in a transaction, but there is no statement being executed in the transaction. idle in transaction (aborted): The backend is in a transaction, but there are statements failed in the transaction. fastpath function call: The backend is executing a fast-path function. disabled: This state is reported if track_activities is disabled in this backend.
event_start_time	timestamp with time zone	Start time of a wait event.
current_xid	xid	ID of the current transaction.
top_xid	xid	ID of the top-level transaction that is being executed.