'\" t
.\"     Title: SHOW POOL_BACKEND_STATS
.\"    Author: The Pgpool Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 2023
.\"    Manual: pgpool-II 4.3.7 Documentation
.\"    Source: pgpool-II 4.3.7
.\"  Language: English
.\"
.TH "SHOW POOL_BACKEND_STATS" "1" "2023" "pgpool-II 4.3.7" "pgpool-II 4.3.7 Documentation"
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.SH "NAME"
SHOW_POOL_BACKEND_STATS \- show backend SQL command statistics
.SH "SYNOPSIS"
.sp
.nf
   SHOW POOL_BACKEND_STATS
  
.fi
.SH "DESCRIPTION"
.PP
\fBSHOW POOL_BACKEND_STATS\fR
displays the node id, the hostname, the port, the status, the role, the SELECT/INSERT/UPDATE/DELETE/DDL/other query counts issued to each backend\&. Also error messages returned from backend are counted and shown, classified by the severity\&. The node id, the hostname, the port, the status, the role are same as
SHOW POOL_NODES (\fBSHOW_POOL_NODES\fR(1))\&.
.PP
select_cnt, insert_cnt, update_cnt, delete_cnt, ddl_cnt, other_cnt are the numbers of SQL command: SELECT, INSERT, UPDATE, DELETE, DDL and others issued since
Pgpool\-II
started\&. Failed commands (for example SELECT from non\-existing table) are counted\&. Commands rolled back are also counted\&. Currently, other than SELECT/WITH/INSERT/UPDATE/DELETE/CHECKPOINT/DEALLOCATE/DISCARD/EXECUTE/ EXPLAIN/LISTEN/LOAD/LOCK/NOTIFY/PREPARE/SET/SHOW/Transaction commands/UNLISTEN are considered as DDL\&.
.PP
Here is an example session:
.sp
.if n \{\
.RS 4
.\}
.nf
test=# show pool_backend_stats;
 node_id | hostname | port  | status |  role   | select_cnt | insert_cnt | update_cnt | delete_cnt | ddl_cnt | other_cnt | panic_cnt | fatal_cnt | error_cnt 
\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-
 0       | /tmp     | 11002 | up     | primary | 12         | 10         | 30         | 0          | 2       | 30        | 0         | 0         | 1
 1       | /tmp     | 11003 | up     | standby | 12         | 0          | 0          | 0          | 0       | 23        | 0         | 0         | 1
(2 rows)
   
.fi
.if n \{\
.RE
.\}
.sp