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+pg_stat_monitor - Statists collector for [PostgreSQL][1].
+
+The pg_stat_monitor is statistics collector tool based on PostgreSQL's pg_stat_statement.
+#### Supported PostgreSQL Versions.
+    *   PostgreSQL Version 11
+    *   PostgreSQL Version 12
+    *   Percona Dsitribution for PostgreSQL
+#### Installation
+There are two ways to install the pg_stat_monitor. The first is by downloading the pg_stat_monitor source code and compiling it. The second option is to download the deb or rpm packages.
+##### Download and compile
+The latest release of pg_stat_monitor can be downloaded from this GitHub page:
+
+    https://github.com/Percona-Lab/pg_stat_monitor/releases
+    
+or it can be downloaded using the git:
+
+    git clone git://github.com/Percona-Lab/pg_stat_monitor.git
+    
+After downloading the code, set the path for the [PostgreSQL][1] binary:
+    cd pg_stat_monitor
+    make USE_PGXS=1
+    make USE_PGXS=1 install
+#### Usage
+There are four views, and complete statistics can be accessed using these views.
+
+    \d pg_stat_monitor;
+                          View "public.pg_stat_monitor"
+           Column        |       Type       | Collation | Nullable | Default 
+    ---------------------+------------------+-----------+----------+---------
+    userid              | oid              |           |          | 
+    dbid                | oid              |           |          | 
+    queryid             | bigint           |           |          | 
+    query               | text             |           |          | 
+    calls               | bigint           |           |          | 
+    total_time          | double precision |           |          | 
+    min_time            | double precision |           |          | 
+    max_time            | double precision |           |          | 
+    mean_time           | double precision |           |          | 
+    stddev_time         | double precision |           |          | 
+    rows                | bigint           |           |          | 
+    shared_blks_hit     | bigint           |           |          | 
+    shared_blks_read    | bigint           |           |          | 
+    shared_blks_dirtied | bigint           |           |          | 
+    shared_blks_written | bigint           |           |          | 
+    local_blks_hit      | bigint           |           |          | 
+    local_blks_read     | bigint           |           |          | 
+    local_blks_dirtied  | bigint           |           |          | 
+    local_blks_written  | bigint           |           |          | 
+    temp_blks_read      | bigint           |           |          | 
+    temp_blks_written   | bigint           |           |          | 
+    blk_read_time       | double precision |           |          | 
+    blk_write_time      | double precision |           |          | 
+    host                | integer          |           |          | 
+    hist_calls          | text             |           |          | 
+    hist_min_time       | text             |           |          | 
+    hist_max_time       | text             |           |          | 
+    hist_mean_time      | text             |           |          | 
+    slow_query          | text             |           |          | 
+    cpu_user_time       | double precision |           |          | 
+    cpu_sys_time        | double precision |           |          | 
+    
+    regression=# \d pg_stat_agg_database 
+                         View "public.pg_stat_agg_database"
+         Column     |           Type           | Collation | Nullable | Default 
+    ----------------+--------------------------+-----------+----------+---------
+     queryid        | bigint                   |           |          | 
+     dbid           | bigint                   |           |          | 
+     userid         | oid                      |           |          | 
+     host           | inet                     |           |          | 
+     total_calls    | integer                  |           |          | 
+     min_time       | double precision         |           |          | 
+     max_time       | double precision         |           |          | 
+     mean_time      | double precision         |           |          | 
+     hist_calls     | text[]                   |           |          | 
+     hist_min_time  | text[]                   |           |          | 
+     hist_max_time  | text[]                   |           |          | 
+     hist_mean_time | text[]                   |           |          | 
+     first_log_time | timestamp with time zone |           |          | 
+     last_log_time  | timestamp with time zone |           |          | 
+     cpu_user_time  | double precision         |           |          | 
+     cpu_sys_time   | double precision         |           |          | 
+     query          | text                     |           |          | 
+     slow_query     | text                     |           |          | 
+    
+    # \d pg_stat_agg_user
+                           View "public.pg_stat_agg_user"
+         Column     |           Type           | Collation | Nullable | Default 
+    ----------------+--------------------------+-----------+----------+---------
+     queryid        | bigint                   |           |          | 
+     dbid           | bigint                   |           |          | 
+     userid         | oid                      |           |          | 
+     host           | inet                     |           |          | 
+     total_calls    | integer                  |           |          | 
+     min_time       | double precision         |           |          | 
+     max_time       | double precision         |           |          | 
+     mean_time      | double precision         |           |          | 
+     hist_calls     | text[]                   |           |          | 
+     hist_min_time  | text[]                   |           |          | 
+     hist_max_time  | text[]                   |           |          | 
+     hist_mean_time | text[]                   |           |          | 
+     first_log_time | timestamp with time zone |           |          | 
+     last_log_time  | timestamp with time zone |           |          | 
+     cpu_user_time  | double precision         |           |          | 
+     cpu_sys_time   | double precision         |           |          | 
+     query          | text                     |           |          | 
+     slow_query     | text                     |           |          | 
+
+    # \d pg_stat_agg_host
+                           View "public.pg_stat_agg_host"
+         Column     |           Type           | Collation | Nullable | Default 
+    ----------------+--------------------------+-----------+----------+---------
+     queryid        | bigint                   |           |          | 
+     dbid           | bigint                   |           |          | 
+     userid         | oid                      |           |          | 
+     host           | inet                     |           |          | 
+     total_calls    | integer                  |           |          | 
+     min_time       | double precision         |           |          | 
+     max_time       | double precision         |           |          | 
+     mean_time      | double precision         |           |          | 
+     hist_calls     | text[]                   |           |          | 
+     hist_min_time  | text[]                   |           |          | 
+     hist_max_time  | text[]                   |           |          | 
+     hist_mean_time | text[]                   |           |          | 
+     first_log_time | timestamp with time zone |           |          | 
+     last_log_time  | timestamp with time zone |           |          | 
+     cpu_user_time  | double precision         |           |          | 
+     cpu_sys_time   | double precision         |           |          | 
+     query          | text                     |           |          | 
+     slow_query     | text                     |           |          |    
+
+#### Limitation
+There are some limitations and Todo's. 
+
+#### Licence
+Copyright (c) 2006 - 2019, Percona LLC.
+See [`LICENSE`][2] for full detail
+
+[1]: https://www.postgresql.org/
+[2]: LICENCE
+[3]: https://github.com/Percona-Lab/pg_stat_monitor/issues/new
+[4]: CONTRIBUTING.md