pgquarrel is a program that compares PostgreSQL database schemas (DDL).

Given two database connections, it output a file that represent the difference between schemas. It means that if you run the output file into the from database, it'll have the same schema as the to database. The main use case is to deploy database changes into testing, staging or production environment.

pgquarrel does not rely on another tool (such as pg_dump) instead it connects directly to PostgreSQL server, obtain meta data from catalog, compare objects and output the commands necessary to turn from database into to database.

It could work with different PostgreSQL versions. The generated file could not work as expected if the to PostgreSQL version is greater than from PostgreSQL version. That's because the tool could generate commands that does not exist in a prior PostgreSQL version.

It works with different operating systems. It was tested on Linux and FreeBSD. I didn't try Windows yet.

pgquarrel is distributed as a source package and can be downloaded at GitHub. The installation steps depend on your operating system.

You can also keep up with the latest fixes and features cloning the Git repository.

$ git clone https://github.com/eulerto/pgquarrel.git

Before installing pgquarrel, you should have PostgreSQL 9.0+ installed (including the header files). If PostgreSQL is not in your search path add -DCMAKE_PREFIX_PATH=/path/to/pgsql to the cmake command.

$ tar -zxf pgquarrel-0.2.0.tgz
$ cd pgquarrel-0.2.0
$ cmake .
$ make

Sorry, never tried.

pgquarrel does not support all of the PostgreSQL objects. Also, pgquarrel does not manipulate data (i.e. DML).

<tr>
	<td>GRANT</td>
	<td>complete</td>
	<td></td>
</tr>
<tr>
	<td>REVOKE</td>
	<td>complete</td>
	<td></td>
</tr>
<tr>
	<td>SECURITY LABEL</td>
	<td>partial</td>
	<td></td>
</tr>
<tr>
	<td>FOREIGN DATA WRAPPER</td>
	<td>complete</td>
	<td></td>
</tr>
<tr>
	<td>FOREIGN TABLE</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>SERVER</td>
	<td>complete</td>
	<td></td>
</tr>
<tr>
	<td>USER MAPPING</td>
	<td>complete</td>
	<td></td>
</tr>
<tr>
	<td>TEXT SEARCH CONFIGURATION</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>TEXT SEARCH DICTIONARY</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>TEXT SEARCH PARSER</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>TEXT SEARCH TEMPLATE</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>COLLATION</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>OPERATOR</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>OPERATOR CLASS</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>OPERATOR FAMILY</td>
	<td>not implemented</td>
	<td></td>
</tr>
<tr>
	<td>ALTER DEFAULT PRIVILEGES</td>
	<td>uncertain</td>
	<td></td>
</tr>
<tr>
	<td>ALTER LARGE OBJECT</td>
	<td>uncertain</td>
	<td></td>
</tr>

Although pgquarrel does not support all PostgreSQL objects, it covers many of the use cases. In future releases, we expect to implement the TODO items to cover more cases. The main absences are:

• inheritance;
• roles.

$ # adjust test/run-test.sh
$ cd pgquarrel-0.2.0/test
$ # test using 9.6 on both clusters
$ ./run-test.sh 96 96 init

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