Database Administration (XWiki.org)

XWiki uses by default a database to store its data. You will find on this page tips and tricks to administer and tune your database setup. For Installation please check the [[Installation guide>>InstallationWAR#HInstallandconfigureaRelationalDatabase]] which contains information on how to setup XWiki for multiple databases.

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= Indexes =

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To improve the performance of your XWiki instance when running with many documents you should run the following script to create indexes for your database (this has been tested for MySQL 5.0):

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== Indexes for XWiki Enterprise versions after 4.3 ==

12

13

14

Even though we configured XWiki to let Hibernate create indexes by default, there are some limitations and some indexes cannot be created automatically for string columns longer than 255 chars ([[MySQL has a limit of 255 characters>>http://dev.mysql.com/doc/refman/5.7/en/column-indexes.html]] - See also [[InnoDB limits>>http://dev.mysql.com/doc/refman/5.7/en/innodb-restrictions.html]]). Thus, at the moment these indexes need to be created manually (for all databases since our default Hibernate configuration file doesn't specify creating indexes for those).

15

16

Note that the following indexes could be created automatically though and thus should be added in a future version of XWiki so that they don't need to be created manually:

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18

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create index xws_number on xwikistatsdoc (XWS_NUMBER);

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create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);

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create index xwr_number on xwikistatsreferer (XWR_NUMBER);

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create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);

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create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);

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create index xwv_number on xwikistatsvisit (XWV_NUMBER);

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create index xda_docid1 on xwikiattrecyclebin (xda_docid);

The following are all the indexes you need to have set in you instance. Most of them are set automatically but as mentioned above some will need to be set manually.

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create index xwl_value on xwikilargestrings (xwl_value(50));

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create index xwd_parent on xwikidoc (xwd_parent(50));

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create index xwd_class_xml on xwikidoc (xwd_class_xml(20));

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create index xws_number on xwikistatsdoc (XWS_NUMBER);

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create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);

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create index xwr_number on xwikistatsreferer (XWR_NUMBER);

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create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);

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create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));

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create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));

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create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));

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create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);

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create index xwv_number on xwikistatsvisit (XWV_NUMBER);

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create index ase_page_date on activitystream_events (ase_page, ase_date);

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create index xda_docid1 on xwikiattrecyclebin (xda_docid);

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create index ase_param1 on activitystream_events (ase_param1(200));

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create index ase_param2 on activitystream_events (ase_param2(200));

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create index ase_param3 on activitystream_events (ase_param3(200));

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create index ase_param4 on activitystream_events (ase_param4(200));

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create index ase_param5 on activitystream_events (ase_param5(200));

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52

53

== Indexes for XWiki Enterprise versions after 3.2 ==

54

55

56

create index xwl_value on xwikilargestrings (xwl_value(50));

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create index xwd_parent on xwikidoc (xwd_parent(50));

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create index xwd_class_xml on xwikidoc (xwd_class_xml(20));

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create index xws_number on xwikistatsdoc (XWS_NUMBER);

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create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);

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create index xwr_number on xwikistatsreferer (XWR_NUMBER);

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create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);

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create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));

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create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));

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create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));

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create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);

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create index xwv_number on xwikistatsvisit (XWV_NUMBER);

68

create index ase_requestid on activitystream_events (ase_requestid(200));

69

create index ase_page_date on activitystream_events (ase_page, ase_date);

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create index xda_docid1 on xwikiattrecyclebin (xda_docid);

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create index ase_param1 on activitystream_events (ase_param1(200));

72

create index ase_param2 on activitystream_events (ase_param2(200));

73

create index ase_param3 on activitystream_events (ase_param3(200));

74

create index ase_param4 on activitystream_events (ase_param4(200));

75

create index ase_param5 on activitystream_events (ase_param5(200));

* Most indexes are created automatically starting with XWiki Enterprise 3.2 and only the indexes listed above need to be created.

80

* For older versions every index must be created manually. You can see the full list of indexes that should be created for older versions below. There is now [[an application>>extensions:Extension.Check Config And Indexes Application]] that runs this script automatically on XE and XEM directly from your wiki.

81

82

83

== Indexes for XWiki Enterprise versions before 3.2 ==

84

85

86

create index DOC_SPACE on xwikidoc (XWD_WEB);

87

create index DOC_NAME on xwikidoc (XWD_NAME);

88

create index DOC_FULLNAME on xwikidoc (XWD_FULLNAME);

89

create index DOC_TITLE on xwikidoc (XWD_TITLE);

90

create index DOC_PARENT on xwikidoc (XWD_PARENT(50));

91

create index DOC_CREATION_DATE on xwikidoc (XWD_CREATION_DATE);

92

create index DOC_DATE on xwikidoc (XWD_DATE);

93

create index DOC_CONTENT_UPDATE_DATE on xwikidoc (XWD_CONTENT_UPDATE_DATE);

94

create index DOC_CREATOR on xwikidoc (XWD_CREATOR);

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create index DOC_AUTHOR on xwikidoc (XWD_AUTHOR);

96

create index DOC_CONTENT_AUTHOR on xwikidoc (XWD_CONTENT_AUTHOR);

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create index DOC_LANGUAGE on xwikidoc (XWD_LANGUAGE);

98

create index DOC_DEFAULT_LANGUAGE on xwikidoc (XWD_DEFAULT_LANGUAGE);

99

create index DOC_CLASS_XML on xwikidoc (XWD_CLASS_XML(20));

100

create index DOC_MINOREDIT on xwikidoc (XWD_MINOREDIT);

101

create index DOC_HIDDEN on xwikidoc (XWD_HIDDEN);

102

create index OBJ_NAME on xwikiobjects (XWO_NAME);

103

create index OBJ_CLASSNAME on xwikiobjects (XWO_CLASSNAME);

104

create index OBJ_NUMBER on xwikiobjects (XWO_NUMBER);

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106

create index XWINT_NAME on xwikiintegers (XWI_NAME);

107

create index XWINT_VALUE on xwikiintegers (XWI_VALUE);

108

create index XWLONG_NAME on xwikilongs (XWL_NAME);

109

create index XWLONG_VALUE on xwikilongs (XWL_VALUE);

110

create index XWFLOAT_NAME on xwikifloats (XWF_NAME);

111

create index XWFLOAT_VALUE on xwikifloats (XWF_VALUE);

112

create index XWDOUBLE_NAME on xwikidoubles (XWD_NAME);

113

create index XWDOUBLE_VALUE on xwikidoubles (XWD_VALUE);

114

create index XWDATE_NAME on xwikidates (XWS_NAME);

115

create index XWDATE_VALUE on xwikidates (XWS_VALUE);

116

create index XWSTR_NAME on xwikistrings (XWS_NAME);

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create index XWSTR_VALUE on xwikistrings (XWS_VALUE);

118

create index XWLS_NAME on xwikilargestrings (XWL_NAME);

119

create index XWLS_VALUE on xwikilargestrings (XWL_VALUE(50));

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121

create index xwr_isdiff on xwikircs(xwr_isdiff);

122

create index xws_name on xwikistatsdoc (XWS_NAME);

123

create index xws_number on xwikistatsdoc (XWS_NUMBER);

124

create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);

125

create index xws_action on xwikistatsdoc (XWS_ACTION);

126

create index xws_page_views on xwikistatsdoc (XWS_PAGE_VIEWS);

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create index xws_unique_visitors on xwikistatsdoc (XWS_UNIQUE_VISITORS);

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create index xws_period on xwikistatsdoc (XWS_PERIOD);

129

create index xws_visits on xwikistatsdoc (XWS_VISITS);

130

create index xwr_number on xwikistatsreferer (XWR_NUMBER);

131

create index xwr_name on xwikistatsreferer (XWR_NAME);

132

create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);

133

create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));

134

create index xwr_page_views on xwikistatsreferer (XWR_PAGE_VIEWS);

135

create index xwr_period on xwikistatsreferer (XWR_PERIOD);

136

create index xwv_start_date on xwikistatsvisit (XWV_START_DATE);

137

create index xwv_name on xwikistatsvisit (XWV_NAME);

138

create index xwv_page_views on xwikistatsvisit (XWV_PAGE_VIEWS);

139

create index xwv_page_saves on xwikistatsvisit (XWV_PAGE_SAVES);

140

create index xwv_downloads on xwikistatsvisit (XWV_DOWNLOADS);

141

create index xwv_end_date on xwikistatsvisit (XWV_END_DATE);

142

create index xwv_ip on xwikistatsvisit (XWV_IP);

143

create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));

144

create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));

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create index xwv_unique_id on xwikistatsvisit (XWV_UNIQUE_ID);

146

create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);

147

create index xwv_number on xwikistatsvisit (XWV_NUMBER);

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149

create index xdd_fullname1 on xwikirecyclebin (xdd_fullname);

150

create index xdd_language on xwikirecyclebin (xdd_language);

151

create index xdd_date on xwikirecyclebin (xdd_date);

152

create index xdd_deleter on xwikirecyclebin (xdd_deleter);

153

create index xda_docid1 on xwikiattrecyclebin (xda_docid);

154

create index xda_doc_name on xwikiattrecyclebin (xda_doc_name);

155

create index xda_filename on xwikiattrecyclebin (xda_filename);

156

create index xda_date on xwikiattrecyclebin (xda_date);

157

create index xda_deleter on xwikiattrecyclebin (xda_deleter);

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159

create index ase_requestid on activitystream_events (ase_requestid(200));

160

create index ase_stream on activitystream_events (ase_stream);

161

create index ase_date on activitystream_events (ase_date);

162

create index ase_type on activitystream_events (ase_type);

163

create index ase_application on activitystream_events (ase_application);

164

create index ase_user on activitystream_events (ase_user);

165

create index ase_wiki on activitystream_events (ase_wiki);

166

create index ase_space on activitystream_events (ase_space);

167

create index ase_page on activitystream_events (ase_page);

168

create index ase_page_date on activitystream_events (ase_page, ase_date);

= Sanity Checks =

To verify the consistency of your XWiki database you can run the sanity check script. The script will select rows that are inconsistent with the logics of XWiki. If no rows are selected, it means the script itself can not detect any error.

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* If you use **MySQL** as your database:

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** The following [[sanity check script>>attach:sanitycheck.sql]] has been tested for **MySQL 5.0** (also been reported to work with MS-SQL)

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** Another [[script>>attach:sanitycheckMySQL4.sql]] is a variant of the previous script for **MySQL 4.x** replacing some syntax with more ancient one (still reports errors in one command)

178

* If you use **postgresql** as your database:

179

** Here is a [[modified version of the sanity check script>>attach:sanitycheck_postgresql.sql]], to be run in the "query" tool of pgAdmin. It is the same as the script for MySQL, except that the syntax for SQL comments is different.

180

** pgAdmin is the GUI tool provided with postgresql to access the database. Run pgAdmin, select the ##xwiki## database, and choose the "Query" option in the "Tools" menu. Then just open the script and click on the play icon ("Execute query").

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= Database browsing =

== DbVisualizer ==

[[DbVisualizer>>http://www.dbvis.com/download/]] natively supports these DBs:

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* DB2 for Windows/Linux

* JavaDB/Derby

* MySQL

* PostgreSQL

* [[and more>>http://www.dbvis.com/features/tour/supported-databases/]]

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Any DB using the corresponding JDBC driver:

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* Example: HSQLDB by using the driver bundled with XWiki

Wiki source code of Database Administration

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author	version	line-number	content
		1	{{box cssClass="floatinginfobox" title="Contents"}}
		2	{{toc/}}
		3	{{/box}}
		4
		5	XWiki uses by default a database to store its data. You will find on this page tips and tricks to administer and tune your database setup. For Installation please check the [[Installation guide>>InstallationWAR#HInstallandconfigureaRelationalDatabase]] which contains information on how to setup XWiki for multiple databases.
		6
		7	= Indexes =
		8
		9	To improve the performance of your XWiki instance when running with many documents you should run the following script to create indexes for your database (this has been tested for MySQL 5.0):
		10
		11	== Indexes for XWiki Enterprise versions after 4.3 ==
		12
		13	{{info}}
		14	Even though we configured XWiki to let Hibernate create indexes by default, there are some limitations and some indexes cannot be created automatically for string columns longer than 255 chars ([[MySQL has a limit of 255 characters>>http://dev.mysql.com/doc/refman/5.7/en/column-indexes.html]] - See also [[InnoDB limits>>http://dev.mysql.com/doc/refman/5.7/en/innodb-restrictions.html]]). Thus, at the moment these indexes need to be created manually (for all databases since our default Hibernate configuration file doesn't specify creating indexes for those).
		15
		16	Note that the following indexes could be created automatically though and thus should be added in a future version of XWiki so that they don't need to be created manually:
		17
		18	{{code}}
		19	create index xws_number on xwikistatsdoc (XWS_NUMBER);
		20	create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);
		21	create index xwr_number on xwikistatsreferer (XWR_NUMBER);
		22	create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);
		23	create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);
		24	create index xwv_number on xwikistatsvisit (XWV_NUMBER);
		25	create index xda_docid1 on xwikiattrecyclebin (xda_docid);
		26	{{/code}}
		27	{{/info}}
		28
		29	The following are all the indexes you need to have set in you instance. Most of them are set automatically but as mentioned above some will need to be set manually.
		30
		31	{{code}}
		32	create index xwl_value on xwikilargestrings (xwl_value(50));
		33	create index xwd_parent on xwikidoc (xwd_parent(50));
		34	create index xwd_class_xml on xwikidoc (xwd_class_xml(20));
		35	create index xws_number on xwikistatsdoc (XWS_NUMBER);
		36	create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);
		37	create index xwr_number on xwikistatsreferer (XWR_NUMBER);
		38	create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);
		39	create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));
		40	create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));
		41	create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));
		42	create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);
		43	create index xwv_number on xwikistatsvisit (XWV_NUMBER);
		44	create index ase_page_date on activitystream_events (ase_page, ase_date);
		45	create index xda_docid1 on xwikiattrecyclebin (xda_docid);
		46	create index ase_param1 on activitystream_events (ase_param1(200));
		47	create index ase_param2 on activitystream_events (ase_param2(200));
		48	create index ase_param3 on activitystream_events (ase_param3(200));
		49	create index ase_param4 on activitystream_events (ase_param4(200));
		50	create index ase_param5 on activitystream_events (ase_param5(200));
		51	{{/code}}
		52
		53	== Indexes for XWiki Enterprise versions after 3.2 ==
		54
		55	{{code}}
		56	create index xwl_value on xwikilargestrings (xwl_value(50));
		57	create index xwd_parent on xwikidoc (xwd_parent(50));
		58	create index xwd_class_xml on xwikidoc (xwd_class_xml(20));
		59	create index xws_number on xwikistatsdoc (XWS_NUMBER);
		60	create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);
		61	create index xwr_number on xwikistatsreferer (XWR_NUMBER);
		62	create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);
		63	create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));
		64	create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));
		65	create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));
		66	create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);
		67	create index xwv_number on xwikistatsvisit (XWV_NUMBER);
		68	create index ase_requestid on activitystream_events (ase_requestid(200));
		69	create index ase_page_date on activitystream_events (ase_page, ase_date);
		70	create index xda_docid1 on xwikiattrecyclebin (xda_docid);
		71	create index ase_param1 on activitystream_events (ase_param1(200));
		72	create index ase_param2 on activitystream_events (ase_param2(200));
		73	create index ase_param3 on activitystream_events (ase_param3(200));
		74	create index ase_param4 on activitystream_events (ase_param4(200));
		75	create index ase_param5 on activitystream_events (ase_param5(200));
		76	{{/code}}
		77
		78	{{info}}
		79	* Most indexes are created automatically starting with XWiki Enterprise 3.2 and only the indexes listed above need to be created.
		80	* For older versions every index must be created manually. You can see the full list of indexes that should be created for older versions below. There is now [[an application>>extensions:Extension.Check Config And Indexes Application]] that runs this script automatically on XE and XEM directly from your wiki.
		81	{{/info}}
		82
		83	== Indexes for XWiki Enterprise versions before 3.2 ==
		84
		85	{{code}}
		86	create index DOC_SPACE on xwikidoc (XWD_WEB);
		87	create index DOC_NAME on xwikidoc (XWD_NAME);
		88	create index DOC_FULLNAME on xwikidoc (XWD_FULLNAME);
		89	create index DOC_TITLE on xwikidoc (XWD_TITLE);
		90	create index DOC_PARENT on xwikidoc (XWD_PARENT(50));
		91	create index DOC_CREATION_DATE on xwikidoc (XWD_CREATION_DATE);
		92	create index DOC_DATE on xwikidoc (XWD_DATE);
		93	create index DOC_CONTENT_UPDATE_DATE on xwikidoc (XWD_CONTENT_UPDATE_DATE);
		94	create index DOC_CREATOR on xwikidoc (XWD_CREATOR);
		95	create index DOC_AUTHOR on xwikidoc (XWD_AUTHOR);
		96	create index DOC_CONTENT_AUTHOR on xwikidoc (XWD_CONTENT_AUTHOR);
		97	create index DOC_LANGUAGE on xwikidoc (XWD_LANGUAGE);
		98	create index DOC_DEFAULT_LANGUAGE on xwikidoc (XWD_DEFAULT_LANGUAGE);
		99	create index DOC_CLASS_XML on xwikidoc (XWD_CLASS_XML(20));
		100	create index DOC_MINOREDIT on xwikidoc (XWD_MINOREDIT);
		101	create index DOC_HIDDEN on xwikidoc (XWD_HIDDEN);
		102	create index OBJ_NAME on xwikiobjects (XWO_NAME);
		103	create index OBJ_CLASSNAME on xwikiobjects (XWO_CLASSNAME);
		104	create index OBJ_NUMBER on xwikiobjects (XWO_NUMBER);
		105
		106	create index XWINT_NAME on xwikiintegers (XWI_NAME);
		107	create index XWINT_VALUE on xwikiintegers (XWI_VALUE);
		108	create index XWLONG_NAME on xwikilongs (XWL_NAME);
		109	create index XWLONG_VALUE on xwikilongs (XWL_VALUE);
		110	create index XWFLOAT_NAME on xwikifloats (XWF_NAME);
		111	create index XWFLOAT_VALUE on xwikifloats (XWF_VALUE);
		112	create index XWDOUBLE_NAME on xwikidoubles (XWD_NAME);
		113	create index XWDOUBLE_VALUE on xwikidoubles (XWD_VALUE);
		114	create index XWDATE_NAME on xwikidates (XWS_NAME);
		115	create index XWDATE_VALUE on xwikidates (XWS_VALUE);
		116	create index XWSTR_NAME on xwikistrings (XWS_NAME);
		117	create index XWSTR_VALUE on xwikistrings (XWS_VALUE);
		118	create index XWLS_NAME on xwikilargestrings (XWL_NAME);
		119	create index XWLS_VALUE on xwikilargestrings (XWL_VALUE(50));
		120
		121	create index xwr_isdiff on xwikircs(xwr_isdiff);
		122	create index xws_name on xwikistatsdoc (XWS_NAME);
		123	create index xws_number on xwikistatsdoc (XWS_NUMBER);
		124	create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);
		125	create index xws_action on xwikistatsdoc (XWS_ACTION);
		126	create index xws_page_views on xwikistatsdoc (XWS_PAGE_VIEWS);
		127	create index xws_unique_visitors on xwikistatsdoc (XWS_UNIQUE_VISITORS);
		128	create index xws_period on xwikistatsdoc (XWS_PERIOD);
		129	create index xws_visits on xwikistatsdoc (XWS_VISITS);
		130	create index xwr_number on xwikistatsreferer (XWR_NUMBER);
		131	create index xwr_name on xwikistatsreferer (XWR_NAME);
		132	create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);
		133	create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));
		134	create index xwr_page_views on xwikistatsreferer (XWR_PAGE_VIEWS);
		135	create index xwr_period on xwikistatsreferer (XWR_PERIOD);
		136	create index xwv_start_date on xwikistatsvisit (XWV_START_DATE);
		137	create index xwv_name on xwikistatsvisit (XWV_NAME);
		138	create index xwv_page_views on xwikistatsvisit (XWV_PAGE_VIEWS);
		139	create index xwv_page_saves on xwikistatsvisit (XWV_PAGE_SAVES);
		140	create index xwv_downloads on xwikistatsvisit (XWV_DOWNLOADS);
		141	create index xwv_end_date on xwikistatsvisit (XWV_END_DATE);
		142	create index xwv_ip on xwikistatsvisit (XWV_IP);
		143	create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));
		144	create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));
		145	create index xwv_unique_id on xwikistatsvisit (XWV_UNIQUE_ID);
		146	create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);
		147	create index xwv_number on xwikistatsvisit (XWV_NUMBER);
		148
		149	create index xdd_fullname1 on xwikirecyclebin (xdd_fullname);
		150	create index xdd_language on xwikirecyclebin (xdd_language);
		151	create index xdd_date on xwikirecyclebin (xdd_date);
		152	create index xdd_deleter on xwikirecyclebin (xdd_deleter);
		153	create index xda_docid1 on xwikiattrecyclebin (xda_docid);
		154	create index xda_doc_name on xwikiattrecyclebin (xda_doc_name);
		155	create index xda_filename on xwikiattrecyclebin (xda_filename);
		156	create index xda_date on xwikiattrecyclebin (xda_date);
		157	create index xda_deleter on xwikiattrecyclebin (xda_deleter);
		158
		159	create index ase_requestid on activitystream_events (ase_requestid(200));
		160	create index ase_stream on activitystream_events (ase_stream);
		161	create index ase_date on activitystream_events (ase_date);
		162	create index ase_type on activitystream_events (ase_type);
		163	create index ase_application on activitystream_events (ase_application);
		164	create index ase_user on activitystream_events (ase_user);
		165	create index ase_wiki on activitystream_events (ase_wiki);
		166	create index ase_space on activitystream_events (ase_space);
		167	create index ase_page on activitystream_events (ase_page);
		168	create index ase_page_date on activitystream_events (ase_page, ase_date);
		169	{{/code}}
		170
		171	= Sanity Checks =
		172
		173	To verify the consistency of your XWiki database you can run the sanity check script. The script will select rows that are inconsistent with the logics of XWiki. If no rows are selected, it means the script itself can not detect any error.
		174
		175	* If you use MySQL as your database:
		176	The following [[sanity check script>>attach:sanitycheck.sql]] has been tested for MySQL 5.0** (also been reported to work with MS-SQL)
		177	Another [[script>>attach:sanitycheckMySQL4.sql]] is a variant of the previous script for MySQL 4.x** replacing some syntax with more ancient one (still reports errors in one command)
		178	* If you use postgresql as your database:
		179	** Here is a [[modified version of the sanity check script>>attach:sanitycheck_postgresql.sql]], to be run in the "query" tool of pgAdmin. It is the same as the script for MySQL, except that the syntax for SQL comments is different.
		180	** pgAdmin is the GUI tool provided with postgresql to access the database. Run pgAdmin, select the ##xwiki## database, and choose the "Query" option in the "Tools" menu. Then just open the script and click on the play icon ("Execute query").
		181
		182	= Database browsing =
		183
		184	== DbVisualizer ==
		185
		186	[[DbVisualizer>>http://www.dbvis.com/download/]] natively supports these DBs:
		187
		188	* DB2 for Windows/Linux
		189	* JavaDB/Derby
		190	* MySQL
		191	* PostgreSQL
		192	* [[and more>>http://www.dbvis.com/features/tour/supported-databases/]]
		193
		194	Any DB using the corresponding JDBC driver:
		195
		196	* Example: HSQLDB by using the driver bundled with XWiki