Wiki source code of PostgreSQL Installation

Version 13.3 by joca on 2014/07/29

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1 Follow these instuctions:
2
3 * Download and install [[PostgreSQL>>http://www.postgresql.org/]]
4 * Download the appropriate [[Postgres JDBC4 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##)
5 * Start PostgreSQL
6 ** On Mac you could issue the following shell commands to start/stop PostgreSQL 9.1 (adapt to your version and to your setup):(((
7 {{code}}
8 sudo -u postgres /Library/PostgreSQL/9.1/bin/pg_ctl start -D /Library/PostgreSQL/9.1/data
9 sudo -u postgres /Library/PostgreSQL/9.1/bin/pg_ctl stop -D /Library/PostgreSQL/9.1/data
10 {{/code}}
11 )))
12 * Create the ##xwiki## user and the ##xwiki## database:(((
13 * Using the ##psql## tool:(((
14 In a shell, start the PostgreSQL interactive terminal: {{code}}psql -U <replace_with_your_admin_user_eg_postgres>{{/code}}
15
16 Create the ##xwiki## database:
17
18 {{code language="none"}}
19 CREATE DATABASE xwiki
20 WITH OWNER = <replace_with_your_admin_user_eg_postgres>
21 ENCODING = 'UNICODE'
22 TABLESPACE = pg_default;
23 {{/code}}
24
25 Verify that the ##xwiki## database is listed in the available databases: {{code}}\l{{/code}}
26
27 Connect to the ##xwiki## database: {{code}}\connect xwiki{{/code}}
28
29 Create a ##xwiki## user: {{code language="none"}}CREATE USER xwiki PASSWORD 'xwiki' VALID UNTIL 'infinity';{{/code}}
30
31 Verify that the ##xwiki## user is listed in the available users: {{code language="none"}}\du{{/code}}
32
33 Give all the permissions to the ##xwiki## user: {{code}}GRANT ALL ON SCHEMA public TO xwiki;{{/code}}
34 )))
35 * Using the ##createuser## and ##createdb## programs:(((
36 {{info}}
37 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).
38 {{/info}}
39
40 Create the ##xwiki## user: {{code}}createuser xwiki -S -D -R -P -Upostgres{{/code}}
41
42 Create the ##xwiki## database: {{code}}createdb xwiki -Eunicode -Oxwiki -Upostgres{{/code}}
43
44 Note that if you need to remove this DB at some point you can issue:{{code}}dropdb -Upostgres xwiki{{/code}}
45 )))
46 )))
47 * 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}}
48
49 == Multiwiki Status ==
50
51 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.
52
53 The mode used is controlled by a property in ##hibernate.cfg.xml##:
54
55 {{code}}
56 <property name="xwiki.virtual_mode">schema|database</property>
57 {{/code}}
58
59 = Performance Tuning =
60
61 In several cases, for example when rolling back a document to a previous version, your postgres log will show something similar:
62
63 {{code}}
64 2013-04-03 18:44:36 EEST LOG: checkpoints are occurring too frequently (22 seconds apart)
65 2013-04-03 18:44:36 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".
66 2013-04-03 18:46:05 EEST LOG: checkpoints are occurring too frequently (6 seconds apart)
67 2013-04-03 18:46:05 EEST HINT: Consider increasing the configuration parameter "checkpoint_segments".
68
69 {{/code}}
70
71 This can result in slow DB performance. If using a production environment, you must set the "checkpoint_segments" parameter from your PostgreSQL configuration.
72 More links related to this:
73 * http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server
74 * http://www.postgresql.org/docs/current/static/runtime-config-wal.html#RUNTIME-CONFIG-WAL-CHECKPOINTS

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