Wiki source code of PostgreSQL Installation

Version 20.2 by Vincent Massol on 2018/11/02

version	line-number	content
14.2	1	{{box cssClass="floatinginfobox" title="Contents"}}
	2	{{toc/}}
	3	{{/box}}
	4
16.1	5	= Installation =
1.18	6
16.1	7	You have 2 options:
19.1	8
16.1	9	* Install PostgreSQL on your machine manually
	10	* Use the official PostgreSQL docker image
	11
	12	== Manual Installation ==
	13
	14	Follow these instructions:
	15
20.2	16	* Download and install [[PostgreSQL>>http://www.postgresql.org/]] (see [[Database support strategy>>dev:Community.DatabaseSupportStrategy]] for the supported versions).
20.1	17	* Download the appropriate [[Postgres JDBC41 driver>>http://jdbc.postgresql.org/download.html]] and copy the JAR into your container's common lib directory or in the XWiki webapp (in ##WEB-INF/lib##)
1.1	18	* Start PostgreSQL
12.1	19	** On Mac you could issue the following shell commands to start/stop PostgreSQL 9.1 (adapt to your version and to your setup):(((
11.7	20	{{code}}
10.1	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	)))
7.1	25	* Create the ##xwiki## user and the ##xwiki## database:(((
12.1	26	* Using the ##psql## tool:(((
11.7	27	In a shell, start the PostgreSQL interactive terminal: {{code}}psql -U <replace_with_your_admin_user_eg_postgres>{{/code}}
1.1	28
7.1	29	Create the ##xwiki## database:
8.1	30
7.1	31	{{code language="none"}}
1.10	32	CREATE DATABASE xwiki
4.1	33	WITH OWNER = <replace_with_your_admin_user_eg_postgres>
1.10	34	ENCODING = 'UNICODE'
	35	TABLESPACE = pg_default;
7.1	36	{{/code}}
1.10	37
11.7	38	Verify that the ##xwiki## database is listed in the available databases: {{code}}\l{{/code}}
7.1	39
11.7	40	Connect to the ##xwiki## database: {{code}}\connect xwiki{{/code}}
5.1	41
11.7	42	Create a ##xwiki## user: {{code language="none"}}CREATE USER xwiki PASSWORD 'xwiki' VALID UNTIL 'infinity';{{/code}}
7.1	43
11.7	44	Verify that the ##xwiki## user is listed in the available users: {{code language="none"}}\du{{/code}}
1.16	45
11.7	46	Give all the permissions to the ##xwiki## user: {{code}}GRANT ALL ON SCHEMA public TO xwiki;{{/code}}
7.1	47	)))
12.1	48	* Using the ##createuser## and ##createdb## programs:(((
11.7	49	{{info}}
7.1	50	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).
11.7	51	{{/info}}
3.1	52
11.7	53	Create the ##xwiki## user: {{code}}createuser xwiki -S -D -R -P -Upostgres{{/code}}
7.1	54
11.7	55	Create the ##xwiki## database: {{code}}createdb xwiki -Eunicode -Oxwiki -Upostgres{{/code}}
7.1	56
11.7	57	Note that if you need to remove this DB at some point you can issue:{{code}}dropdb -Upostgres xwiki{{/code}}
4.1	58	)))
7.1	59	)))
11.7	60	* 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}}
11.8	61
16.1	62	== Using Docker ==
	63
	64	* Install Docker
	65	* Run the following command (update to your needs):(((
	66	{{code language="bash"}}
	67	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" -v postgres-data:/var/lib/postgresql/data -p 5432:5432 postgres:9.5
	68	{{/code}}
	69	)))
	70	* Download the appropriate [[Postgres JDBC41 driver>>http://jdbc.postgresql.org/download.html]]. 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##)
	71	* 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}}
	72
14.3	73	= Multiwiki Status =
11.8	74
13.1	75	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.
11.8	76
	77	The mode used is controlled by a property in ##hibernate.cfg.xml##:
	78
	79	{{code}}
	80	<property name="xwiki.virtual_mode">schema\|database</property>
	81	{{/code}}
	82
12.1	83	= Performance Tuning =
	84
	85	In several cases, for example when rolling back a document to a previous version, your postgres log will show something similar:
	86
	87	{{code}}
	88	2013-04-03 18:44:36 EEST LOG: checkpoints are occurring too frequently (22 seconds apart)
	89	2013-04-03 18:44:36 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".
	90	2013-04-03 18:46:05 EEST LOG: checkpoints are occurring too frequently (6 seconds apart)
	91	2013-04-03 18:46:05 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".
	92
	93	{{/code}}
	94
	95	This can result in slow DB performance. If using a production environment, you must set the "checkpoint_segments" parameter from your PostgreSQL configuration.
	96	More links related to this:
19.1	97
12.1	98	* http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server
	99	* http://www.postgresql.org/docs/current/static/runtime-config-wal.html#RUNTIME-CONFIG-WAL-CHECKPOINTS
15.1	100
	101	= Troubleshooting =
	102
	103	== Method org.postgresql.jdbc4.Jdbc4Connection.isValid(int) is not yet implemented ==
	104
	105	Versions of the Postgres JDBC driver older than 9.2 do not support that method. Try to update the ##postgresql-*.jar##
	106
	107	* if installed from debian package, try to update at least to the version from jessy
	108	** for example download from https://packages.debian.org/jessie/all/libpostgresql-jdbc-java/download
19.1	109	** then use ##dpkg ~-~-install libpostgresql-jdbc-java_9.2-1002-1_all.deb## to install\\
15.1	110	* alternatively if you use tomcat8, try downgrading to tomcat7
	111	* otherwise find the ##postgresql-*.jar## in your webapp and replace it by a newer version downloaded from https://jdbc.postgresql.org/download.html
	112
	113	Restart the server to apply the changes.
	114
17.1	115	== Relation "hibernate_sequence" already exists ==
	116
18.1	117	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.

Wiki source code of PostgreSQL Installation

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