ZenPack:PostgreSQL

Organization

Zenoss, Inc.

License

GNU General Public License, Version 2, or later

ZenPack name

ZenPacks.zenoss.PostgreSQL

More Information

GitHub page/HomePage

Git sources (for cloning)

Link

Applications Monitored: 

• PostgreSQL (8.1, 8.4, 9.1, 9.2)

PostgreSQL ZenPack

Monitoring for PostgreSQL databases.

Support

This is an Open Source ZenPack developed by Zenoss, Inc. Enterprise support for this ZenPack is available to commercial customers with an active subscription.

Releases

Version 1.0.8- Download

Released on 2014/11/06

Compatible with Zenoss Core 3.1.x, Zenoss Core 3.2.x, Zenoss Core 4.2.x, Zenoss Resource Manager 4.1.x, Zenoss Resource Manager 4.2.x

Background

This ZenPack makes it possible to monitor the performance of a PostgreSQL database server, the individual databases, and the tables within those databases.

Features

The features added by this ZenPack can be summarized as follows. They are each detailed further below.

• Discovery of PostgreSQL components.
• Monitoring of PostgreSQL metrics.

Discovery

The following types of components will be automatically discovered. The attributes and collections will be updated on Zenoss' normal remodeling interval which defaults to every 12 hours.

Databases

• Attributes: Name, OID, Size, Table Count
• Collections: Tables

Tables

• Attributes: Name, OID, Schema, Size, Size, Database

Monitoring

The following metrics will be collected every 5 minutes by default.

Server

• Metrics: Summaries of all databases and tables.

Databases

• Metrics: Size, Backends, Summaries of all tables.
• Latency Metrics: Connection, SELECT 1
• Connection Metrics: Total, Active, Idle
• Duration Metrics: Active Transactions (min/avg/max), Idle Transactions (min/avg/max), Queries (min/avg/max)
• Efficiency Metrics: Transaction Rollback Percentage, Tuple Fetch Percentage
• Transaction Rate Metrics: Commits/sec, Rollbacks/sec
• Tuple Rate Metrics: Returned/sec, Fetched/sec, Inserted/sec, Updated/sec, Deleted/sec
• Lock Metrics: Total, Granted, Waiting, Exclusive, AccessExclusive

Tables

• Scan Rate Metrics: Sequential/sec, Indexed/sec
• Tuple Rate Metrics: Sequentially Read/sec, Index Fetched/sec, Inserted/sec, Updated/sec, Hot Updated/sec, Deleted/sec
• Tuple Metrics: Live, Dead

Usage

Once the PostgreSQL ZenPack is installed you will have the following new configuration properties which should be set either for device classes or individual devices.

Configuration Properties

• zPostgreSQLPort - Port where PostgreSQL is listening. Default: 5432
• zPostgreSQLUseSSL - Whether to use SSL or not. Default: False
• zPostgreSQLUsername - Must be a superuser. Default: postgres
• zPostgreSQLPassword - Password for user. No default.

In addition to setting these properties you must add the zenoss.PostgreSQL modeler plugin to a device class or individual device. This modeler plugin will discover all databases and tables using the connectivity information provided through the above settings. Each database and table will automatically be monitored.

PostgreSQL Server Impact

Zenoss will run the following queries every five (5) minutes. These queries are intended to be lightweight so as to not adversely affect the server's performance.

-- Database statistics - Run once.
SELECT d.datname,
       pg_database_size(s.datid) AS SIZE,
       numbackends,
       xact_commit, xact_rollback,
       blks_read, blks_hit,
       tup_returned, tup_fetched, tup_inserted,
       tup_updated, tup_deleted
  FROM pg_database AS d
  JOIN pg_stat_database AS s ON s.datname = d.datname
 WHERE NOT datistemplate AND datallowconn
 
-- Connection statistics - Run once.
SELECT datname, xact_start, query_start, backend_start,
       now() AS now
  FROM pg_stat_activity
 
-- Lock statistics - Run once.
SELECT d.datname, l.mode, l.GRANTED
  FROM pg_database AS d
  LEFT JOIN pg_locks AS l ON l.DATABASE = d.oid
 WHERE NOT d.datistemplate AND d.datallowconn
 
-- Table statistics - Run once per database.
SELECT relname,
       pg_relation_size(relid),
       pg_total_relation_size(relid),
       seq_scan, seq_tup_read,
       idx_scan, idx_tup_fetch,
       n_tup_ins, n_tup_upd, n_tup_del,
       n_tup_hot_upd, n_live_tup, n_dead_tup,
       last_vacuum, last_autovacuum,
       last_analyze, last_autoanalyze
  FROM pg_stat_user_tables

The following queries will be run whenever the PostgreSQL server device is remodeled. This occur once every 12 hours.

-- Database list - Run once.
SELECT d.datname, s.datid, pg_database_size(s.datid) AS SIZE
  FROM pg_database AS d
  JOIN pg_stat_database AS s ON s.datname = d.datname
 WHERE NOT datistemplate AND datallowconn
 
-- Table list - Run once per database.
SELECT relname, relid, schemaname,
       pg_relation_size(relid) AS SIZE,
       pg_total_relation_size(relid) AS total_size
  FROM pg_stat_user_tables

Installation

Normal Installation (packaged egg)

1. Download the appropriate egg file for the version of Zenoss you are running.
2. Ensure you are logged in as the zenoss user:

   $ sudo su - zenoss

3. Install the ZenPack:

   $ zenpack --install ZenPacks.zenoss.PostgreSQL-*.egg

4. Restart these services:

   $ zenoss restart

Developer Mode Installation

In order to do a development mode installation you will want to clone the existing git repository, and then use the --link flag with the zenpack command:

1. Ensure you are logged in as the zenoss user:

   $ sudo su - zenoss

2. Start by cloning the upstream repository:

   $ git clone git://github.com/zenoss/ZenPacks.zenoss.PostgreSQL.git

3. Next, perform the installation:

   $ zenpack --link --install ZenPacks.zenoss.PostgreSQL

4. Finally, restart these serivices:

   $ zenoss restart

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