PostgreSQL Workload Analyzer detailled installation guide

Read and the official documentation for further details about PoWA.

PoWA requires PostgreSQL 9.4 or more. This documentation assumes you're using the 9.4 version of PostgreSQL.

The following documentation describes the detailed installation steps to install PoWA.

Download powa-archivist from the website

The latest stable version should be used. It can be downloaded from github.

This documentation assumes that the latest version is 3.0.0, and you downloaded the .zip file.

Unpack the downloaded file

cd /usr/src unzip

Compile and install the software

Before proceeding, be sure to have a compiler installed and the appropriate PostgreSQL development packages. Something like apt-get install postgresql-server-dev-9.4 or yum install postgresql94-devel

Then: cd /usr/src/powa-REL_3_0_0 make

If everything goes fine, you will have this kind of output : gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g -fpic -I. -I. -I/home/thomas/postgresql/postgresql-9.3.4/include/server -I/home/thomas/postgresql/postgresql-9.4.4/include/internal -D_GNU_SOURCE -I/usr/include/libxml2 -c -o powa.o powa.c gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g -fpic -L/home/thomas/postgresql/postgresql-9.3.4/lib -Wl,--as-needed -Wl,-rpath,'/home/thomas/postgresql/postgresql-9.4.4/lib',--enable-new-dtags -shared -o powa.o

Install the software :

  • This step has to be made with the user that has installed PostgreSQL. If you have used a package, it will be certainly be root. If so: sudo make install Else, sudo into the user that owns your PostgreSQL executables, and make install

It should output something like the following : /bin/mkdir -p '/usr/pgsql-9.4/share/extension' /bin/mkdir -p '/usr/pgsql-9.4/share/extension' /bin/mkdir -p '/usr/pgsql-9.4/lib' /bin/mkdir -p '/usr/pgsql-9.4/share/doc/extension' /usr/bin/install -c -m 644 ./powa.control '/usr/pgsql-9.4/share/extension/' /usr/bin/install -c -m 644 ./powa--2.0.1.sql ./powa--2.0-2.0.1.sql ./powa--3.0.0.sql '/usr/pgsql-9.4/share/extension/' /usr/bin/install -c -m 755 '/usr/pgsql-9.4/postgresql-9.4.4/lib/' /usr/bin/install -c -m 644 ./ '/usr/pgsql-9.4/share/doc/extension/'

Create a PoWA database and create required extensions

Note: if you are upgrading from a previous PoWA release, please consult the upgrading section at the end of this file.

First, connect to PostgreSQL as administrator : bash-4.1$ psql psql (9.3.5) Type "help" for help. postgres=# create database powa; CREATE DATABASE postgres=# \c powa You are now connected to database "powa" as user "postgres". powa=# create extension pg_stat_statements ; CREATE EXTENSION powa=# create extension btree_gist ; CREATE EXTENSION powa=# create extension powa; CREATE EXTENSION powa=# \dt List of relations Schema | Name | Type | Owner --------+---------------------------------+-------+---------- public | powa_functions | table | postgres public | powa_last_aggregation | table | postgres public | powa_last_purge | table | postgres public | powa_statements | table | postgres public | powa_statements_history | table | postgres public | powa_statements_history_current | table | postgres [...]

Modify the configuration files

In postgresql.conf:

Change the shared_preload_libraries appropriately : shared_preload_libraries = 'powa,pg_stat_statements'# (change requires restart)

If possible (check with pg_test_timing), activate track_io_timing on your instance, in postgresql.conf :

track_io_timing = on

Other GUC variables are available. Read for further details.

In pg_hba.conf:

Add an entry if needed for the PostgreSQL user(s) that need to connect on the GUI. For instance, assuming a local connection on database powa, allowing any user:

host powa all md5

Restart PostgreSQL

As root, run the following command : service postgresql-9.3 restart

PostgreSQL should output the following messages in the log files : 2014-07-25 03:48:20 IST LOG: registering background worker "powa" 2014-07-25 03:48:20 IST LOG: loaded library "powa" 2014-07-25 03:48:20 IST LOG: loaded library "pg_stat_statements"

Upgrading from a previous version of PoWA

If you already have an older PoWA installation, you can simply upgrade PoWA with the following steps :

First, connect to PostgreSQL as administrator and update the extension : bash-4.1$ psql powa psql (9.3.5) Type "help" for help. powa=# ALTER EXTENSION powa UPDATE ; ALTER EXTENSION

However, due to a lot of changes in the data storage, it's not possible to update to PoWA 3.0.0. In this case, you need to drop and create the extension.

Next, you will need to restart PostgreSQL in order to take account of the updated background worker. As root, run the following command : service postgresql-9.4 restart