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 current feature is a lab feature. Contact Huawei engineers for technical support before using it.) Only the user with the sysadmin or monitor admin permission can query this view.

The data in GaussDB is deleted every 3 minutes. If the GUC parameter enable_resource_record is set to on, the records in the view are dumped to the GS_WLM_SESSION_QUERY_INFO_ALL system catalog every 3 minutes and deleted from the view. If enable_resource_record is set to off, the records are retained in the view for 3 minutes and then deleted.

**Table 1** GS_WLM_SESSION_HISTORY columns
Name	Type	Description
datid	oid	OID of the database that the backend is connected to
dbname	text	Name of the database that the backend is connected to
schemaname	text	Schema name
nodename	text	Name of the CN where the statement is executed
username	text	Username 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 the backend. If this column is null, either the client is connected via a Unix socket on the server machine or 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 (-1 if a Unix socket is used)
query_band	text	Job type, which is specified by the GUC parameter query_band. The default value is a null string.
block_time	bigint	Duration (in ms) that a statement is blocked before being executed, including the statement parsing and optimization duration
start_time	timestamp with time zone	Time when the statement starts to run
finish_time	timestamp with time zone	Time when the statement execution ends
duration	bigint	Execution time of the statement, in ms
estimate_total_time	bigint	Estimated execution time of the statement, in ms
status	text	Final statement execution status, which can be finished (normal) or aborted (abnormal).
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 size of the statement.
min_peak_memory	integer	Minimum memory peak of the statement across all DNs, in MB
max_peak_memory	integer	Maximum memory peak of the statement across all DNs, in MB
average_peak_memory	integer	Average memory usage during statement execution, in MB
memory_skew_percent	integer	Memory usage skew of the statement among each DN
spill_info	text	Statement spill information on all DNs. None: No data is spilled to disks. All: Data is spilled to disks on all DNs. [a:b]: 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, in MB (default value: 0)
max_spill_size	integer	Maximum spilled data among all DNs when a spill occurs, in MB (default value: 0)
average_spill_size	integer	Average spilled data among all DNs when a spill occurs, in MB (default value: 0)
spill_skew_percent	integer	DN spill skew when a spill occurs
min_dn_time	bigint	Minimum execution time of the statement across all DNs, in ms
max_dn_time	bigint	Maximum execution time of the statement across all DNs, in ms
average_dn_time	bigint	Average execution time of the statement across all DNs, in ms
dntime_skew_percent	integer	Execution time skew of the statement among each DN
min_cpu_time	bigint	Minimum CPU time of the statement across all DNs, in ms
max_cpu_time	bigint	Maximum CPU time of the statement across all DNs, in ms
total_cpu_time	bigint	Total CPU time of the statement across all DNs, in ms
cpu_skew_percent	integer	CPU time skew of the statement among DNs
min_peak_iops	integer	Minimum IOPS peak of the statement across all DNs. It is counted by ones in a column-store table and by ten thousands in a row-store table.
max_peak_iops	integer	Maximum IOPS peak of the statement across all DNs. It is counted by ones in a column-store table and by ten thousands in a row-store table.
average_peak_iops	integer	Average IOPS peak of the statement across all DNs. It is counted by ones in a column-store table and by ten thousands in a row-store table.
iops_skew_percent	integer	I/O skew across DNs
warning	text	Warning. The following warnings and warnings related to Optimizing SQL Self-Diagnosis 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 the statement
node_group	text	Logical cluster of the user running the statement. (The current feature is a lab feature. Contact Huawei engineers for technical support before using it.)
cpu_top1_node_name	text	Name of the node with the highest CPU usage
cpu_top2_node_name	text	Name of the node with the second highest CPU usage
cpu_top3_node_name	text	Name of the node with the third highest CPU usage
cpu_top4_node_name	text	Name of the node with the fourth highest CPU usage
cpu_top5_node_name	text	Name of the node with the fifth highest CPU usage
mem_top1_node_name	text	Name of the node with the highest memory usage
mem_top2_node_name	text	Name of the node with the second highest CPU usage
mem_top3_node_name	text	Name of the node with the third highest CPU usage
mem_top4_node_name	text	Name of the node with the fourth highest CPU usage
mem_top5_node_name	text	Name of the node with the fifth highest CPU usage
cpu_top1_value	bigint	CPU usage
cpu_top2_value	bigint	CPU usage
cpu_top3_value	bigint	CPU usage
cpu_top4_value	bigint	CPU usage
cpu_top5_value	bigint	CPU usage
mem_top1_value	bigint	Memory usage
mem_top2_value	bigint	Memory usage
mem_top3_value	bigint	Memory usage
mem_top4_value	bigint	Memory usage
mem_top5_value	bigint	Memory usage
top_mem_dn	text	Top N memory usage
top_cpu_dn	text	Top N CPU usage