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v3.1

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GS_WLM_SESSION_STATISTICS

GS_WLM_SESSION_STATISTICS displays load management information about jobs being executed by the current user on the database instance. Only users with the sysadmin permission can query this view.

Table 1 GS_WLM_SESSION_STATISTICS columns

Name Type Description
datid oid OID of the database the backend is connected to
dbname name Name of the database the backend is connected to
schemaname text Schema name
nodename text Name of the database instance where the statement is executed
username name Username used for connecting to the backend
application_name text Name of the application connected to the backend
client_addr inet IP address of the client connected to the 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 be non-null only for IP connections and only when log_hostname is enabled.
client_port integer TCP port number that the client uses for communication with the 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.
pid bigint ID of the backend thread
sessionid bigint Session ID
block_time bigint Block time before the statement is run. The unit is ms.
start_time timestamp with time zone Time when the statement execution starts
duration bigint Duration that the statement has been executed (unit: ms)
estimate_total_time bigint Estimated execution time of the statement. The unit is ms.
estimate_left_time bigint Estimated remaining time of statement execution. The unit is ms.
enqueue text Resource status in workload management
resource_pool name 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 the statement across the database instances, in MB
max_peak_memory integer Maximum memory peak of the statement across the database instances, 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 the database instances
spill_info text Information about statement spill to the database instances:
- None: The statement has not been spilled to disks on the database instances.
- All: The statement has been spilled to disks on the database instances.
- [a:b]: The statement has been spilled to disks on a of b database instances.
min_spill_size integer Minimum spilled data among database instances when a spill occurs (unit: MB). The default value is 0.
max_spill_size integer Maximum spilled data among database instances when a spill occurs (unit: MB). The default value is 0.
average_spill_size integer Average spilled data among database instances when a spill occurs (unit: MB). The default value is 0.
spill_skew_percent integer Database instance spill skew when a spill occurs
min_dn_time bigint Minimum execution time of the statement across the database instances (unit: ms)
max_dn_time bigint Maximum execution time of the statement across the database instances (unit: ms)
average_dn_time bigint Average execution time of the statement across the database instances (unit: ms)
dntime_skew_percent integer Execution time skew of the statement among the database instances
min_cpu_time bigint Minimum CPU time of the statement across the database instances (unit: ms)
max_cpu_time bigint Maximum CPU time of the statement across the database instances (unit: ms)
total_cpu_time bigint Total CPU time of the statement across the database instances (unit: ms)
cpu_skew_percent integer CPU time skew of the statement among the database instances
min_peak_iops integer Minimum IOPS peak of the statement across the database instances. 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 the database instances. 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 the database instances. 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 of the statement among the database instances
warning text Warning. The following warnings 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 that is being executed
query_plan text Execution plan of the statement
node_group text Logical database instance of the user to which the statement belongs
top_cpu_dn text Top N CPU usage
top_mem_dn text Top N memory usage
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