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==Java==
: 1- XA JDBC driver for Postgre (needed for NexJ Express Model)
:: XA Data Source, as for what they mean: XA are for distributed transactions (as per the Open Group specificitions) and non-XA are not (transactions must be single-database). [http://www.theserverside.com/discussions/thread.tss?thread_id=21385]
:: Hierarchy for package [http://jdbc.postgresql.org/development/privateapi/org/postgresql/xa/package-tree.html org.postgresql.xa] - src of the hirearchy [http://grepcode.com/file/repository.jboss.com/maven2/postgresql/postgresql/8.3-603.jdbc3/org/postgresql/core/ConnectionFactory.java?av=f]
:: [http://jdbc.postgresql.org/todo.html Bugs]
:: Postgresql Limited XA Support[http://www.atomikos.com/Documentation/KnownProblems#Postgresql_Limited_XA_Support] - PostgreSQL XA support is limited in what it can do; using Postgresql is not recommended and not supported. If you do choose to use it, see this forum post for some of the problems.
: [http://www.postgresql.org/docs/8.4/static/app-psql.html psql]
: [http://www.postgresql.org/docs/9.0/interactive/app-pg-ctl.html working with server]
: psql [http://www.postgresonline.com/special_feature.php?sf_name=postgresql83_psql_cheatsheet&outputformat=html cheatsheet]
* GUI
: PGAdimn [http://www.pgadmin.org/visualtour.php Visual tour]
: Compare Data types [http://www.linuxnetworks.de/doc/index.php/OpenDBX/DBMS_Datatypes]
: Compare MySQL, Oracle, PostgreSQL [http://www-css.fnal.gov/dsg/external/freeware/mysql-vs-pgsql.html
: Compare Converting MySQL to PostgreSQL -> data types & Functions & Command-line [http://en.wikibooks.org/wiki/Converting_MySQL_to_PostgreSQL]