GS_WLM_SESSION_HISTORY

GS_WLM_SESSION_HISTORY displays load management information about a completed job executed by the current user on the current CN. The view is used by Database Manager to query data from GaussDB(DWS). The view returns the data queried from the GS_WLM_SESSION_INFO table within three minutes only when the GUC parameter enable_resource_track is set to on.

**Table 1** GS_WLM_SESSION_HISTORY columns
Name	Type	Description
datid	oid	OID of the database this backend is connected to
dbname	text	Name of the database the backend is connected to
schemaname	text	Schema name
nodename	text	Name of the CN where the statement is run
username	text	User name used for connecting to the backend
application_name	text	Name of the application that is connected to the backend
client_addr	inet	IP address of the client connected to this backend. If this column is null, it indicates either that the client is connected via a Unix socket on the server machine or that this is an internal process such as autovacuum.
client_hostname	text	Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This column will only be non-null for IP connections, and only when log_hostname is enabled.
client_port	integer	TCP port number that the client uses for communication with this backend, or -1 if a Unix socket is used
query_band	text	Job type, which is specified by the query_band parameter. The default value is a null string.
block_time	bigint	Duration that a statement is blocked before being executed, including the statement parsing and optimization duration. The unit is ms.
start_time	timestamp with time zone	Time when the statement starts to be run
finish_time	timestamp with time zone	Time when the statement execution ends
duration	bigint	Execution time of a statement. The unit is ms.
estimate_total_time	bigint	Estimated execution time of a statement. The unit is ms.
status	text	Final statement execution status. Its value can be finished (normal) or aborted (abnormal). The statement status here is the execution status of the database server. If the statement is successfully executed on the database server but an error is reported in the result set, the statement status is finished.
abort_info	text	Exception information displayed if the final statement execution status is aborted.
resource_pool	text	Resource pool used by the user
control_group	text	Cgroup used by the statement
estimate_memory	integer	Estimated memory used by the statement. The unit is MB.
min_peak_memory	integer	Minimum memory peak of a statement across all DNs. The unit is MB.
max_peak_memory	integer	Maximum memory peak of a statement across all DNs. The unit is MB.
average_peak_memory	integer	Average memory usage during statement execution. The unit is MB.
memory_skew_percent	integer	Memory usage skew of a statement among DNs.
spill_info	text	Statement spill information on all DNs. None indicates that the statement has not been flushed to disks on any DNs. All indicates that the statement has been spilled to disks on every DN. [a:b] indicates that the statement has been spilled to disks on a of b DNs.
min_spill_size	integer	Minimum spilled data among all DNs when a spill occurs. The default value is 0. The unit is MB.
max_spill_size	integer	Minimum spilled data among all DNs when a spill occurs. The default value is 0. The unit is MB.
average_spill_size	integer	Average spilled data among all DNs when a spill occurs. The default value is 0. The unit is MB.
spill_skew_percent	integer	DN spill skew when a spill occurs
min_dn_time	bigint	Minimum execution time of a statement across all DNs. The unit is ms.
max_dn_time	bigint	Maximum execution time of a statement across all DNs. The unit is ms.
average_dn_time	bigint	Average execution time of a statement across all DNs. The unit is ms.
dntime_skew_percent	integer	Execution time skew of a statement among DNs.
min_cpu_time	bigint	Minimum CPU time of a statement across all DNs. The unit is ms.
max_cpu_time	bigint	Maximum CPU time of a statement across all DNs. The unit is ms.
total_cpu_time	bigint	Total CPU time of a statement across all DNs. The unit is ms.
cpu_skew_percent	integer	CPU time skew of a statement among DNs.
min_peak_iops	integer	Minimum I/O peak of a statement on all DNs (times/s in column-store tables and 10,000 times/s in row-store tables). This function is not enabled in cluster version 8.1.3. Therefore, you are not advised to refer to this field to analyze memory problems.
max_peak_iops	integer	Maximum I/O peak of a statement on all DNs (times/s in column-store tables and 10,000 times/s in row-store tables). This function is not enabled in cluster version 8.1.3. Therefore, you are not advised to refer to this field to analyze memory problems.
average_peak_iops	integer	Average I/O peak of a statement on all DNs (times/s in column-store tables and 10,000 times/s in row-store tables). This function is not enabled in cluster version 8.1.3. Therefore, you are not advised to refer to this field to analyze memory problems.
iops_skew_percent	integer	I/O skew of a statement among DNs. This function is not enabled in the 8.1.3 cluster. You are not advised to refer to this field to analyze memory problems.
warning	text	Warning. The following warnings and warnings related to SQL self-diagnosis tuning are displayed: Spill file size large than 256MB Broadcast size large than 100MB Early spill Spill times is greater than 3 Spill on memory adaptive Hash table conflict
queryid	bigint	Internal query ID used for statement execution
query	text	Statement executed
query_plan	text	Execution plan of a statement
node_group	text	Logical cluster of the user running the statement
pid	bigint	PID of the backend thread of the statement
lane	text	Fast/Slow lane where the statement is executed
unique_sql_id	bigint	ID of the normalized unique SQL.