PostgreSQL Installation (XWiki.org)

= Installation =

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You have 2 options:

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* Install PostgreSQL on your machine manually

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* Use the official PostgreSQL docker image

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== Manual Installation ==

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Follow these instructions:

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* Download and install [[PostgreSQL>>http://www.postgresql.org/]] (see [[Database support strategy>>dev:Community.DatabaseSupportStrategy]] for the supported versions).

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* Download the appropriate [[Postgres JDBC 4.2 driver>>https://jdbc.postgresql.org/download/]] and copy the JAR into your container's common lib directory or in the XWiki webapp (in ##WEB-INF/lib##)

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* Start PostgreSQL

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** On Mac you could issue the following shell commands to start/stop PostgreSQL 9.1 (adapt to your version and to your setup):(((

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sudo -u postgres /Library/PostgreSQL/9.1/bin/pg_ctl start -D /Library/PostgreSQL/9.1/data

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sudo -u postgres /Library/PostgreSQL/9.1/bin/pg_ctl stop -D /Library/PostgreSQL/9.1/data

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)))

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* Create the ##xwiki## user and the ##xwiki## database:(((

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* Using the ##psql## tool:(((

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In a shell, start the PostgreSQL interactive terminal: {{code}}psql -U <replace_with_your_admin_user_eg_postgres>{{/code}}

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Create the ##xwiki## database:

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CREATE DATABASE xwiki

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WITH OWNER = <replace_with_your_admin_user_eg_postgres>

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ENCODING = 'UNICODE'

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LOCALE_PROVIDER = 'builtin'

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LOCALE = 'C.UTF-8'

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TABLESPACE = pg_default;

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Verify that the ##xwiki## database is listed in the available databases: {{code}}\l{{/code}}

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Connect to the ##xwiki## database: {{code}}\connect xwiki{{/code}}

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Create a ##xwiki## user: {{code language="none"}}CREATE USER xwiki PASSWORD 'xwiki' VALID UNTIL 'infinity';{{/code}}

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Verify that the ##xwiki## user is listed in the available users: {{code language="none"}}\du{{/code}}

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Give all the permissions to the ##xwiki## user: {{code}}GRANT ALL PRIVILEGES ON DATABASE xwiki TO xwiki;{{/code}}

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)))

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* Using the ##createuser## and ##createdb## programs:(((

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Make sure that the ##createuser## and ##createdb## programs are in your ##$PATH##. The example below also assumes that the ##postgres## user exists in your setup (this is the default on Linux).

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Create the ##xwiki## user: {{code}}createuser xwiki -S -D -R -P -Upostgres{{/code}}

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Create the ##xwiki## database: {{code}}createdb xwiki -Eunicode --locale-provider=builtin --builtin-locale=C.UTF-8 -Oxwiki -Upostgres{{/code}}

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Note that if you need to remove this DB at some point you can issue:{{code}}dropdb -Upostgres xwiki{{/code}}

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)))

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)))

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* Tell XWiki to use this database. To do this, edit the ##WEB-INF/hibernate.cfg.xml## file where you have expanded the XWiki WAR file and uncomment the PostgreSQL part. Make sure to review the ##connection.url## property. For example a typical value would be:{{code}}<property name="connection.url">jdbc:postgresql://localhost:5432/xwiki</property>{{/code}}

== Using Docker ==

* Install Docker

* Run the following command (update to your needs):(((

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docker run --name pgtest -e POSTGRES_PASSWORD=xwiki -e POSTGRES_ROOT_PASSWORD=xwiki -e POSTGRES_USER=xwiki -e POSTGRES_DB=xwiki -e "POSTGRES_INITDB_ARGS=--encoding=UTF8 --locale-provider=builtin --locale=C.UTF-8" -v postgres-data:/var/lib/postgresql/data -p 5432:5432 postgres:9.5

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)))

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* Download the appropriate [[Postgres JDBC 4.2 driver>>https://jdbc.postgresql.org/download/]]. You can also download it directly from the [[Maven Central Repository>>http://repo1.maven.org/maven2/postgresql/postgresql/]] and copy the JAR into your container's common lib directory or in the XWiki webapp (in ##WEB-INF/lib##)

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* Tell XWiki to use this database. To do this, edit the ##WEB-INF/hibernate.cfg.xml## file where you have expanded the XWiki WAR file and uncomment the PostgreSQL part. Make sure to review the ##connection.url## property. For example a typical value would be:{{code}}<property name="connection.url">jdbc:postgresql://localhost:5432/xwiki</property>{{/code}}

= Multiwiki Status =

Prior to XWiki 4.5M1, multiwiki mode was not fully working on PostgreSQL. Since XWiki 4.5M1, we've made it work in ##schema## mode (i.e. a subwiki is represented as a Schema in the database). However it's not working in ##database## mode for the moment (i.e. a subwiki is represented as a Catalog in the database) because the PostGreSQL JDBC Driver doesn't support yet the ##setCatalog## method.

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The mode used is controlled by a property in ##hibernate.cfg.xml##:

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<property name="xwiki.virtual_mode">schema|database</property>

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= Performance Tuning =

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In several cases, for example when rolling back a document to a previous version, your postgres log will show something similar:

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2013-04-03 18:44:36 EEST LOG: checkpoints are occurring too frequently (22 seconds apart)

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2013-04-03 18:44:36 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".

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2013-04-03 18:46:05 EEST LOG: checkpoints are occurring too frequently (6 seconds apart)

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2013-04-03 18:46:05 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".

This can result in slow DB performance. If using a production environment, you must set the "checkpoint_segments" parameter from your PostgreSQL configuration.

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More links related to this:

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* http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server

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* http://www.postgresql.org/docs/current/static/runtime-config-wal.html#RUNTIME-CONFIG-WAL-CHECKPOINTS

= Troubleshooting =

== Method org.postgresql.jdbc4.Jdbc4Connection.isValid(int) is not yet implemented ==

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Versions of the Postgres JDBC driver older than 9.2 do not support that method. Try to update the ##postgresql-*.jar##

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* if installed from debian package, try to update at least to the version from jessy

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** for example download from https://packages.debian.org/jessie/all/libpostgresql-jdbc-java/download

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** then use ##dpkg ~-~-install libpostgresql-jdbc-java_9.2-1002-1_all.deb## to install

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* alternatively if you use tomcat8, try downgrading to tomcat7

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* otherwise find the ##postgresql-*.jar## in your webapp and replace it by a newer version downloaded from https://jdbc.postgresql.org/download.html

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Restart the server to apply the changes.

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== Relation "hibernate_sequence" already exists ==

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If you see this error in your postgres logs, you should know that it's normal and expected. Because of a [[bug in Hibernate>>https://github.com/xwiki/xwiki-platform/blob/1d8e1172757a75cda44398820505dacf384e0a56/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/store/XWikiHibernateBaseStore.java#L576-L576]] we need to create this sequence if it doesn't exist and it's [[hard to check that in a DB-independent way>>https://jira.xwiki.org/browse/XWIKI-14055]]. Thus we simply create the sequence and if it already exists you get this error at startup in your logs.

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author	version	line-number	content
		1	{{box cssClass="floatinginfobox" title="Contents"}}
		2	{{toc/}}
		3	{{/box}}
		4
		5	= Installation =
		6
		7	You have 2 options:
		8
		9	* Install PostgreSQL on your machine manually
		10	* Use the official PostgreSQL docker image
		11
		12	== Manual Installation ==
		13
		14	Follow these instructions:
		15
		16	* Download and install [[PostgreSQL>>http://www.postgresql.org/]] (see [[Database support strategy>>dev:Community.DatabaseSupportStrategy]] for the supported versions).
		17	* Download the appropriate [[Postgres JDBC 4.2 driver>>https://jdbc.postgresql.org/download/]] and copy the JAR into your container's common lib directory or in the XWiki webapp (in ##WEB-INF/lib##)
		18	* Start PostgreSQL
		19	** On Mac you could issue the following shell commands to start/stop PostgreSQL 9.1 (adapt to your version and to your setup):(((
		20	{{code}}
		21	sudo -u postgres /Library/PostgreSQL/9.1/bin/pg_ctl start -D /Library/PostgreSQL/9.1/data
		22	sudo -u postgres /Library/PostgreSQL/9.1/bin/pg_ctl stop -D /Library/PostgreSQL/9.1/data
		23	{{/code}}
		24	)))
		25	* Create the ##xwiki## user and the ##xwiki## database:(((
		26	* Using the ##psql## tool:(((
		27	In a shell, start the PostgreSQL interactive terminal: {{code}}psql -U <replace_with_your_admin_user_eg_postgres>{{/code}}
		28
		29	Create the ##xwiki## database:
		30
		31	{{code language="none"}}
		32	CREATE DATABASE xwiki
		33	WITH OWNER = <replace_with_your_admin_user_eg_postgres>
		34	ENCODING = 'UNICODE'
		35	LOCALE_PROVIDER = 'builtin'
		36	LOCALE = 'C.UTF-8'
		37	TABLESPACE = pg_default;
		38	{{/code}}
		39
		40	Verify that the ##xwiki## database is listed in the available databases: {{code}}\l{{/code}}
		41
		42	Connect to the ##xwiki## database: {{code}}\connect xwiki{{/code}}
		43
		44	Create a ##xwiki## user: {{code language="none"}}CREATE USER xwiki PASSWORD 'xwiki' VALID UNTIL 'infinity';{{/code}}
		45
		46	Verify that the ##xwiki## user is listed in the available users: {{code language="none"}}\du{{/code}}
		47
		48	Give all the permissions to the ##xwiki## user: {{code}}GRANT ALL PRIVILEGES ON DATABASE xwiki TO xwiki;{{/code}}
		49	)))
		50	* Using the ##createuser## and ##createdb## programs:(((
		51	{{info}}
		52	Make sure that the ##createuser## and ##createdb## programs are in your ##$PATH##. The example below also assumes that the ##postgres## user exists in your setup (this is the default on Linux).
		53	{{/info}}
		54
		55	Create the ##xwiki## user: {{code}}createuser xwiki -S -D -R -P -Upostgres{{/code}}
		56
		57	Create the ##xwiki## database: {{code}}createdb xwiki -Eunicode --locale-provider=builtin --builtin-locale=C.UTF-8 -Oxwiki -Upostgres{{/code}}
		58
		59	Note that if you need to remove this DB at some point you can issue:{{code}}dropdb -Upostgres xwiki{{/code}}
		60	)))
		61	)))
		62	* Tell XWiki to use this database. To do this, edit the ##WEB-INF/hibernate.cfg.xml## file where you have expanded the XWiki WAR file and uncomment the PostgreSQL part. Make sure to review the ##connection.url## property. For example a typical value would be:{{code}}<property name="connection.url">jdbc:postgresql://localhost:5432/xwiki</property>{{/code}}
		63
		64	== Using Docker ==
		65
		66	* Install Docker
		67	* Run the following command (update to your needs):(((
		68	{{code language="bash"}}
		69	docker run --name pgtest -e POSTGRES_PASSWORD=xwiki -e POSTGRES_ROOT_PASSWORD=xwiki -e POSTGRES_USER=xwiki -e POSTGRES_DB=xwiki -e "POSTGRES_INITDB_ARGS=--encoding=UTF8 --locale-provider=builtin --locale=C.UTF-8" -v postgres-data:/var/lib/postgresql/data -p 5432:5432 postgres:9.5
		70	{{/code}}
		71	)))
		72	* Download the appropriate [[Postgres JDBC 4.2 driver>>https://jdbc.postgresql.org/download/]]. You can also download it directly from the [[Maven Central Repository>>http://repo1.maven.org/maven2/postgresql/postgresql/]] and copy the JAR into your container's common lib directory or in the XWiki webapp (in ##WEB-INF/lib##)
		73	* Tell XWiki to use this database. To do this, edit the ##WEB-INF/hibernate.cfg.xml## file where you have expanded the XWiki WAR file and uncomment the PostgreSQL part. Make sure to review the ##connection.url## property. For example a typical value would be:{{code}}<property name="connection.url">jdbc:postgresql://localhost:5432/xwiki</property>{{/code}}
		74
		75	= Multiwiki Status =
		76
		77	Prior to XWiki 4.5M1, multiwiki mode was not fully working on PostgreSQL. Since XWiki 4.5M1, we've made it work in ##schema## mode (i.e. a subwiki is represented as a Schema in the database). However it's not working in ##database## mode for the moment (i.e. a subwiki is represented as a Catalog in the database) because the PostGreSQL JDBC Driver doesn't support yet the ##setCatalog## method.
		78
		79	The mode used is controlled by a property in ##hibernate.cfg.xml##:
		80
		81	{{code}}
		82	<property name="xwiki.virtual_mode">schema\|database</property>
		83	{{/code}}
		84
		85	= Performance Tuning =
		86
		87	In several cases, for example when rolling back a document to a previous version, your postgres log will show something similar:
		88
		89	{{code}}
		90	2013-04-03 18:44:36 EEST LOG: checkpoints are occurring too frequently (22 seconds apart)
		91	2013-04-03 18:44:36 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".
		92	2013-04-03 18:46:05 EEST LOG: checkpoints are occurring too frequently (6 seconds apart)
		93	2013-04-03 18:46:05 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".
		94
		95	{{/code}}
		96
		97	This can result in slow DB performance. If using a production environment, you must set the "checkpoint_segments" parameter from your PostgreSQL configuration.
		98	More links related to this:
		99
		100	* http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server
		101	* http://www.postgresql.org/docs/current/static/runtime-config-wal.html#RUNTIME-CONFIG-WAL-CHECKPOINTS
		102
		103	= Troubleshooting =
		104
		105	== Method org.postgresql.jdbc4.Jdbc4Connection.isValid(int) is not yet implemented ==
		106
		107	Versions of the Postgres JDBC driver older than 9.2 do not support that method. Try to update the ##postgresql-*.jar##
		108
		109	* if installed from debian package, try to update at least to the version from jessy
		110	** for example download from https://packages.debian.org/jessie/all/libpostgresql-jdbc-java/download
		111	** then use ##dpkg ~-~-install libpostgresql-jdbc-java_9.2-1002-1_all.deb## to install
		112	* alternatively if you use tomcat8, try downgrading to tomcat7
		113	* otherwise find the ##postgresql-*.jar## in your webapp and replace it by a newer version downloaded from https://jdbc.postgresql.org/download.html
		114
		115	Restart the server to apply the changes.
		116
		117	== Relation "hibernate_sequence" already exists ==
		118
		119	If you see this error in your postgres logs, you should know that it's normal and expected. Because of a [[bug in Hibernate>>https://github.com/xwiki/xwiki-platform/blob/1d8e1172757a75cda44398820505dacf384e0a56/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/store/XWikiHibernateBaseStore.java#L576-L576]] we need to create this sequence if it doesn't exist and it's [[hard to check that in a DB-independent way>>https://jira.xwiki.org/browse/XWIKI-14055]]. Thus we simply create the sequence and if it already exists you get this error at startup in your logs.