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Sorin Burjan 12.3 1 {{box cssClass="floatinginfobox" title="**Contents**"}}
2 {{toc/}}
3 {{/box}}
AkiBackman 1.22 4
Caleb James DeLisle 9.1 5 = Compatibility Considerations =
Sorin Burjan 12.3 6
Vincent Massol 49.2 7 See [[Database support strategy>>dev:Community.DatabaseSupportStrategy]] for the supported versions.
8
Thomas Mortagne 80.1 9 XWiki expects the database to use ##utf8## or ##utf8mb4## encoding with collation ##*_bin## and it's highly recommended to use ##utf8mb4## (and ##utf8mb4_bin##) which is the default since MySQL 8.
Thomas Mortagne 79.1 10
Caleb James DeLisle 9.1 11 == MyISAM storage engine ==
Sorin Burjan 12.3 12
Ricardo Rodríguez 71.1 13 MyISAM (the default storage engine for MySQL until release 5.5.5 in 2010) does not support transactions. If there is an error while data is being saved to the database, XWiki will attempt to roll back the transaction to its previous known good state. If you use MyISAM, it will do nothing, leaving the database in whatever state it was in when the error occurred.
Caleb James DeLisle 9.1 14
Ahmet Taşdöven 43.1 15 {{warning}}
Beat Burgener 72.2 16 If you use MySQL with any engine that does not support transactions, you will most likely corrupt your database.** We highly recommend using a storage engine such as InnoDB which supports transactions.**
Ahmet Taşdöven 43.1 17 {{/warning}}
18
Caleb James DeLisle 9.1 19 == MySQL versions older than 5.0 ==
Sorin Burjan 12.3 20
Ricardo Rodríguez 71.1 21 XWiki does not fully work with MySQL versions 4.x or lower, due to several limitations of the way the SQL standards are implemented in MySQL, limited support for non-latin1 encodings, the flaky integration of Hibernate and MySQL 4, and other things. Most parts of the application work fine, but there are some parts that cannot be easily fixed, so if you must use MySQL 4.x, you're doing it on your own. MySQL 4 is pretty old and buggy, so we recommend upgrading.
Caleb James DeLisle 9.1 22
Thomas Mortagne 66.1 23 == MySQL versions older than 5.7 and utf8mb4 ==
Thomas Mortagne 65.1 24
Ricardo Rodríguez 71.1 25 If you use utf8mb4 encoding, you won't be able to use a version of MySQL older than 5.7 out of the box because of a limitation in the default maximum size of the keys and the default row format.
Thomas Mortagne 65.1 26
Vincent Massol 68.1 27 == JDBC Driver Version ==
28
29 * It's recommended to use the latest version of the MySQL JDBC driver (8.x) if you're using MySQL 5.7+.
Thomas Mortagne 70.1 30 * If you're using XWiki < 13.3RC1, you should not use version 8.0.23 of the MySQL JDBC driver since it [[causes a problem with the Liquibase version used in XWiki>>https://jira.xwiki.org/browse/XWIKI-18515]].
Vincent Massol 68.1 31
Vincent Massol 7.1 32 = Installation Steps =
vmassol 1.12 33
Vincent Massol 1.11 34 Follow these instructions:
35
Thomas Mortagne 67.1 36 * Download and install [[MySQL>>http://www.mysql.com/]] 5.7 or greater.
37 * Start the MySQL server. You can do that in several ways. For example use {{code language="shell"}}mysqld --console{{/code}}
Vincent Massol 44.1 38 * Create the wiki database. You can use the name you want for the database, but you will have to set the hibernate configuration file and ##xwiki.cfg## file accordingly.(((
39 You can create the database in several ways. For example use:
40
Thomas Mortagne 67.1 41 {{code language="shell"}}
Thomas Mortagne 51.1 42 mysql -u root -e "create database xwiki default character set utf8mb4 collate utf8mb4_bin"
Vincent Massol 30.2 43 {{/code}}
44 )))
Thomas Mortagne 58.1 45 * Create the ##xwiki## user with password ##xwiki##(((
Thomas Mortagne 67.1 46 {{code language="shell"}}
Thomas Mortagne 59.1 47 mysql -u root -e "CREATE USER 'xwiki'@'localhost' IDENTIFIED BY 'xwiki'";
Thomas Mortagne 58.1 48 {{/code}}
49 )))
Thomas Mortagne 67.1 50 * Give privileges to the ##xwiki## user for accessing and creating databases (for the multi wiki support). Specifically the ##xwiki## users needs permissions to be able to execute {{code language="sql"}}CREATE DATABASE{{/code}}, {{code language="sql"}}DROP SCHEMA{{/code}}, and then all CRUD operations on tables. Note that the command below should be tuned to be more restrictive as granting all permissions is not required:(((
51 {{code language="shell"}}
Thomas Mortagne 58.1 52 mysql -u root -e "grant all privileges on *.* to xwiki@localhost"
Vincent Massol 30.2 53 {{/code}}
54 )))
Vincent Massol 44.1 55 * If the above command fails with a password-does-not-meet-requirements error, uninstall the MySQL password_validate plugin or pick a more complex password and update the password used by default in ##hibernate.cfg.xml##:(((
Thomas Mortagne 67.1 56 {{code language="shell"}}
Vincent Massol 44.1 57 mysql -u root -p -e "uninstall plugin validate_password;"
Douglas Landau 35.1 58 {{/code}}
Vincent Massol 44.1 59 )))
Vincent Massol 43.3 60 * Please make sure that the DNS-name "localhost" is defined in your hosts-file (i.e. ##/etc/hosts##)
Vincent Massol 66.5 61 * You need to have the MySQL JDBC Driver JAR (named ##mysql-connector-java*.jar##) installed in XWiki's WAR file. If this file isn't present in XWiki's ##WEB-INF/lib## directory you'll need to download it and copy it there. You can download it from the [[MySQL Connector/J Driver page>>http://www.mysql.com/downloads/connector/j/]] or directly from the [[Maven Central Repository>>https://repo1.maven.org/maven2/mysql/mysql-connector-java/]].(((
Ahmet Taşdöven 43.1 62 {{warning}}
Vincent Massol 44.1 63 You need the 5.x version or higher. The 3.x version doesn't handle Boolean data correctly and will either throw errors or will make all documents hidden by default.
Ahmet Taşdöven 43.1 64 {{/warning}}
Ahmet Taşdöven 41.1 65 )))
Vincent Massol 44.1 66 * Now you need to tell XWiki to use MySQL. To do this, edit the ##WEB-INF/hibernate.cfg.xml## file where you have expanded the XWiki WAR file and replace the matching properties with the following ones:(((
Douglas Landau 32.3 67 {{code language="xml"}}
68 <property name="connection.url">jdbc:mysql://localhost/xwiki</property>
vmassol 1.2 69 <property name="connection.username">xwiki</property>
70 <property name="connection.password">xwiki</property>
AkiBackman 1.22 71 <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
Vincent Massol 44.1 72 <property name="connection.useUnicode">true</property>
73 <property name="connection.characterEncoding">UTF-8</property>
Douglas Landau 32.3 74 {{/code}}
Vincent Massol 30.2 75
Dmitry Bakbardin 15.1 76 {{info}}
Vincent Massol 66.4 77 * By default MySQL only accepts packets that are smaller than 1MB. If you get the "Packet for query is too large (max_allowed_packet)" error then see the [[Packet too large error page>>http://dev.mysql.com/doc/refman/5.0/en/packet-too-large.html]]. For example to increase the packet size to 32M you could start the MySQL server with {{code language='shell'}}mysqld --console --max_allowed_packet=32M{{/code}} or you can modify directly the ##my.cnf## configuration file to set this value permanently.
Vincent Massol 44.1 78 * If an empty XWiki starts with no errors, but you are unable to upload the default set of pages (XAR file) try to increase the ##max_allowed_packet## parameter as shown above.
Dmitry Bakbardin 15.1 79 {{/info}}
Ahmet Taşdöven 43.1 80 )))
81
Vincent Massol 55.1 82 = Indexes =
83
84 See [[Database Administration>>Documentation.AdminGuide.Performances.Database Administration.WebHome]].
85
Thomas Mortagne 67.1 86 {{code language="mysql"}}
Vincent Massol 55.1 87 // Required
88 create index xwl_value on xwikilargestrings (xwl_value(50));
89 create index xwd_parent on xwikidoc (xwd_parent(50));
90 create index xwd_class_xml on xwikidoc (xwd_class_xml(20));
91 create index xda_docid1 on xwikiattrecyclebin (xda_docid);
Thomas Mortagne 72.1 92 create index solr_iterate_all_documents on xwikidoc (XWD_WEB(500), XWD_NAME(253), XWD_LANGUAGE(5), XWD_VERSION(10));
Vincent Massol 55.1 93 // Only required if you use stats (feature is off by default)
94 create index xws_number on xwikistatsdoc (XWS_NUMBER);
95 create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);
96 create index xwr_number on xwikistatsreferer (XWR_NUMBER);
97 create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);
98 create index xwr_referer on xwikistatsreferer (XWR_REFERER(50));
99 create index xwv_user_agent on xwikistatsvisit (XWV_USER_AGENT(255));
100 create index xwv_cookie on xwikistatsvisit (XWV_COOKIE(255));
101 create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);
102 create index xwv_number on xwikistatsvisit (XWV_NUMBER);
103 {{/code}}
104
105 {{info}}
106 Note to XWiki developers: The following indexes could be created automatically though since they're less than 255 characters and thus should be added in a future version of XWiki so that they don't need to be created manually:
107
Eduard Moraru 68.2 108 {{code language="mysql"}}
Vincent Massol 55.1 109 create index xws_number on xwikistatsdoc (XWS_NUMBER);
110 create index xws_classname on xwikistatsdoc (XWS_CLASSNAME);
111 create index xwr_number on xwikistatsreferer (XWR_NUMBER);
112 create index xwr_classname on xwikistatsreferer (XWR_CLASSNAME);
113 create index xwv_classname on xwikistatsvisit (XWV_CLASSNAME);
114 create index xwv_number on xwikistatsvisit (XWV_NUMBER);
115 create index xda_docid1 on xwikiattrecyclebin (xda_docid);
116 {{/code}}
117 {{/info}}
118
Vincent Massol 44.1 119 = Tips =
Ahmet Taşdöven 43.1 120
Vincent Massol 60.1 121 == MySQL 8 ==
122
123 * If you're using MySQL 8+ you'll need to configure MySQL with native password: ##default-authentication-plugin=mysql_native_password##.
124 * You'll also be able to switch from ##com.mysql.jdbc.Driver## to ##com.mysql.cj.jdbc.Driver## JDBC driver (since the previous driver class is now deprecated).
Vincent Massol 64.1 125 * If you get the following error then you'll need to force the timezone to use either by setting it in:(((
126 * The MySQL conf file on the server
127 * In the XWiki ##hibernate.cfg.xml## file in the ##hibernate.connection.serverTimezone## property (e.g. ##<property name="hibernate.connection.serverTimezone">Europe/Berlin</property>##).
128 * In the XWiki ##hibernate.cfg.xml## file inside the JDBC URL string as in ##jdbc:mysql:~/~/localhost:3306/myschema?serverTimezone=UTC##
129
Thomas Mortagne 67.1 130 {{code language="none"}}
Vincent Massol 63.1 131 The server timezone value 'CDT' is unrecognized or represents more than one timezone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc timezone value if you want to utilize timezone support.
132 {{/code}}
Vincent Massol 60.1 133
Vincent Massol 63.1 134 For more details see [[this explanation post>>https://stackoverflow.com/a/54256150/153102]].
135 )))
136
Thomas Mortagne 77.1 137 == Convert a database to utf8mb4/utf8mb4_bin ==
Vincent Massol 27.1 138
Thomas Mortagne 67.1 139 {{code language="shell"}}
Vincent Massol 44.1 140 #!/bin/bash
Ahmet Taşdöven 43.1 141
Vincent Massol 44.1 142 db=xwiki
Thomas Mortagne 52.1 143 to_character_set=utf8mb4
144 to_collation=utf8mb4_bin
Ahmet Taşdöven 43.1 145
Vincent Massol 44.1 146 mysql_cmd="mysql -u root"
147
Thomas Mortagne 52.1 148 $mysql_cmd -e "ALTER DATABASE $db CHARACTER SET $to_character_set COLLATE $to_collation;"
Vincent Massol 44.1 149
150 TBL_LIST=$($mysql_cmd -N -s -r -e "use $db;show tables;")
151
Thomas Mortagne 75.1 152 echo "Temporarily disable all the foreign keys"
153
154 $MYSQL_COMMAND -e "SET FOREIGN_KEY_CHECKS=0;"
Vincent Massol 44.1 155 for tbl_name in $TBL_LIST;
156 do
157 $mysql_cmd -e "alter table $db.$tbl_name convert to character set $to_character_set collate $to_collation;"
158 done
159
Thomas Mortagne 75.1 160 echo "Turn foreign keys back on"
161
162 $MYSQL_COMMAND -e "SET FOREIGN_KEY_CHECKS=1;"
163
Vincent Massol 44.1 164 echo "Here the result of the operation:"
165 $mysql_cmd -e "USE $db;SELECT TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, COLLATION_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA=DATABASE();"
Ahmet Taşdöven 43.1 166 {{/code}}
167
Thomas Mortagne 76.1 168 {{info}}
Mohamed Boussaa 72.3 169 In case the above script fails with "ERROR 1118 (42000) at line 1: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
170 xwikistatsvisit", you can use the following SQL statements to change tables column types to LONGTEXT to be able to convert the tables to utf8mb4.
Thomas Mortagne 76.1 171 {{/info}}
Mohamed Boussaa 72.3 172
173 {{code}}
174 ALTER TABLE activitystream_events MODIFY ase_url LONGTEXT, MODIFY ase_title LONGTEXT, MODIFY ase_body LONGTEXT, MODIFY ase_param1 LONGTEXT, MODIFY ase_param2 LONGTEXT, MODIFY ase_param3 LONGTEXT, MODIFY ase_param4 LONGTEXT, MODIFY ase_param5 LONGTEXT;
175 ALTER TABLE xwikistatsreferer MODIFY XWR_REFERER LONGTEXT;
176 ALTER TABLE xwikistatsvisit MODIFY XWV_USER_AGENT LONGTEXT, MODIFY XWV_COOKIE LONGTEXT;
177 ALTER TABLE xwikipreferences MODIFY XWP_LEFT_PANELS LONGTEXT, MODIFY XWP_RIGHT_PANELS LONGTEXT, MODIFY XWP_DOCUMENT_BUNDLES LONGTEXT;
178 {{/code}}
179
Guillaume Delhumeau 57.1 180 You can also look at [[this snippet to perform this conversion inside XWiki>>snippets:Extension.Migrate MySQL databases to utf8mb4]].
Guillaume Delhumeau 56.1 181
Vincent Massol 44.1 182 == Convert from MyISAM to InnoDB ==
Ahmet Taşdöven 43.1 183
Thomas Mortagne 67.1 184 {{code language="shell"}}
Vincent Massol 44.1 185 #!/bin/bash
186
187 MYSQL_COMMAND=mysql
188 TO_ENGINE=INNODB
189
190 DATABASES=$(mysql -N -s -r -e 'show databases'|grep -v ^information_schema$|grep -v ^mysql$)
191
192 for db in $DATABASES
193 do
194
195 echo "Working on database $db..."
196 echo ""
197
198 TABLES=$(mysql -N -s -r -e "show tables from $db;")
199
200 for tb in $TABLES
201 do
202
203 $MYSQL_COMMAND -e "ALTER TABLE $db.$tb ENGINE = $TO_ENGINE;"
204
205 done
206
207 $MYSQL_COMMAND -e "SELECT table_name,Engine,table_collation FROM information_schema.tables WHERE table_schema = DATABASE();"
208
209 echo ""
210 echo ""
211
212 done
Ahmet Taşdöven 43.1 213 {{/code}}
214
Vincent Massol 44.1 215 = Troubleshooting =
216
Thomas Mortagne 79.1 217 == "Incorrect string value" error with MySQL connector 8.0.29+ ==
Thomas Mortagne 78.1 218
219 There seems to be a regression in MySQL connector 8.0.29 that leads to using the default encoding even when it's explicitly indicated in the hibernate.cfg.xml file (which is what you have in the MySQL configuration recommendation provided by XWiki). We are currently searching what could be the cause and find a workaround in https://jira.xwiki.org/browse/XWIKI-19853 but in the (and in general) it's recommended to make sure that you are running XWiki with the right default Java encoding. You can do that by making sure Java is run with ##-Dfile.encoding=utf8## (this is generally the default in standard Tomcat packages of various Linux distribution, but it might not always be the case).
220
Vincent Massol 44.1 221 == Unable to login to MySQL Console ==
222
Thomas Mortagne 67.1 223 When running {{code language="shell"}}mysql -u root -e "create database xwiki default character set utf8mb4{{/code}} you may get a {{code}}ERROR 1045 (28000): Access denied for user 'xwiki'@'localhost' (using password: YES){{/code}} error.
Ahmet Taşdöven 43.1 224 This means that you have a password set for the MySQL root user, but you are not specifying it in the console command. You must also use the //-p// parameter. Using this you will be prompted to enter the password and be allowed to login to the MySQL console and create the database.
225
Vincent Massol 7.1 226 == Can't create test file ==
Vincent Massol 6.2 227
Ahmet Taşdöven 43.1 228 When running ##mysqld ~-~-console## you may get the following (especially if you're on a Mac):
Vincent Massol 1.16 229
Thomas Mortagne 67.1 230 {{code language="none"}}
Vincent Massol 1.16 231 071111 17:20:53 [Warning] Can't create test file /usr/local/mysql-5.0.45-osx10.4-i686/data/Vincent.lower-test
232 071111 17:20:53 [Warning] Can't create test file /usr/local/mysql-5.0.45-osx10.4-i686/data/Vincent.lower-test
233 mysqld: Can't change dir to '/usr/local/mysql-5.0.45-osx10.4-i686/data/' (Errcode: 13)
234 071111 17:20:53 [ERROR] Aborting
Vincent Massol 7.1 235 {{/code}}
Vincent Massol 1.16 236
Vincent Massol 44.1 237 To start MySQL run the following command instead:
Vincent Massol 1.16 238
Vincent Massol 44.1 239 {{code}}
Vincent Massol 1.16 240 sudo /usr/local/mysql/bin/mysqld_safe --user=mysql
Vincent Massol 7.1 241 {{/code}}
Vincent Massol 1.16 242
Vincent Massol 7.1 243 == Data Truncation Error ==
2smart4u 5.1 244
Ahmet Taşdöven 43.1 245 If you receive an Exception like the following while installing/upgrading XWiki, chances are that you are using an outdated version of MySQLConnectorJ.
2smart4u 5.1 246
Thomas Mortagne 67.1 247 {{code language="none"}}
2smart4u 5.1 248 Caused by: java.sql.BatchUpdateException: Data truncation: Out of
249 range value adjusted for column 'XWD_HIDDEN' at row 1
250 at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:894)
251 at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294)
252 at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294)
253 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
254 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
Vincent Massol 7.1 255 {{/code}}
2smart4u 5.1 256
Ahmet Taşdöven 43.1 257 On Linux, mysql-connector-java-3.x has proven **not** to work due to a bug in the handling of UTF-8 and lack of support for Boolean types.
2smart4u 5.1 258
Vincent Massol 7.2 259 Upgrading to the latest version of MySQLConnectorJ should solve such an error in most of the cases.
Ahmet Taşdöven 43.1 260
261 == HTTP 500 Error ==
262
Thomas Mortagne 67.1 263 {{code language="none"}}
Ahmet Taşdöven 43.1 264 HTTP Status 500 -
265
266 type Exception report
267
268 message
269
270 descriptionThe server encountered an internal error () that prevented it from fulfilling this request.
271
272 exception
273
274 javax.servlet.ServletException: com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context
275 Wrapped Exception: Error number 3001 in 3: Cannot load class com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from param xwiki.store.migration.manager.class
276 Wrapped Exception: Error number 0 in 3: Exception while hibernate execute
277 Wrapped Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it.
278
279 root cause
280
281 com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context
282 Wrapped Exception: Error number 3001 in 3: Cannot load class com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from param xwiki.store.migration.manager.class
283 Wrapped Exception: Error number 0 in 3: Exception while hibernate execute
284 Wrapped Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it.
285 {{/code}}
286
Vincent Massol 44.1 287 In this case, try to disable **skip-networking** in MySQL *.ini file. Thanks a lot //M Rawash// (see his comment below).
288
289 == Unknown database 'xwiki' ==
290
291 If you get the following error:
292
Thomas Mortagne 67.1 293 {{code language="none"}}
Vincent Massol 44.1 294 Caused by: class com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'xwiki'
295 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
296 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
297 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
298 at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
299 at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
300 at com.mysql.jdbc.Util.getInstance(Util.java:383)
301 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1062)
302 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4226)
303 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4158)
304 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)
305 at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)
306 at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2834)
307 at com.mysql.jdbc.ConnectionImpl.setCatalog(ConnectionImpl.java:5456)
308 at org.apache.commons.dbcp.DelegatingConnection.setCatalog(DelegatingConnection.java:374)
309 at org.apache.commons.dbcp.DelegatingConnection.setCatalog(DelegatingConnection.java:374)
310 at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.setCatalog(PoolingDataSource.java:333)
311 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
312 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
313 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
314 at java.lang.reflect.Method.invoke(Method.java:606)
315 at org.hibernate.jdbc.BorrowedConnectionProxy.invoke(BorrowedConnectionProxy.java:74)
316 at com.sun.proxy.$Proxy47.setCatalog(Unknown Source)
317 at com.xpn.xwiki.store.XWikiHibernateBaseStore.setDatabase(XWikiHibernateBaseStore.java:729)
318 at com.xpn.xwiki.store.XWikiHibernateBaseStore.beginTransaction(XWikiHibernateBaseStore.java:911)
319 at com.xpn.xwiki.store.XWikiHibernateBaseStore.beginTransaction(XWikiHibernateBaseStore.java:843)
320 at com.xpn.xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java:830)
321 ...
322 {{/code}}
323
324 It means that XWiki could connect to your database but there's no ##xwiki## schema available there. This is the default name of the schema XWiki is looking for, for the main wiki database.
325
Thomas Mortagne 67.1 326 It probably means you've created a database named other than ##xwiki## (for example you might have created a database named ##abcd## and set the following connection URL in your ##hibernate.cfg## file: {{code language="none"}}<property name="connection.url">jdbc:mysql://localhost/abcd</property>{{/code}}).
Vincent Massol 44.1 327
328 If this is the case [[you need to tell XWiki that you're using a different schema by setting the ##xwiki.db## configuration property>>platform:AdminGuide.Configuration#HConfigurethenamesofdatabaseschemas]].
329
330 == MySQLSyntaxErrorException: Row size too large (> 8126) ==
331
332 if you get the following error:
333
Thomas Mortagne 67.1 334 {{code language="none"}}
Vincent Massol 44.1 335 MySQLSyntaxErrorException: Row size too large (> 8126).
336 Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help.
337 In current row format, BLOB prefix of 768 bytes is stored inline.
338 {{/code}}
339
Eduard Moraru 68.2 340 When you are using a MySQL Server 5.6.20 you can get a "row size too large error."
Vincent Massol 44.1 341 In the release notes, it is explained that a innodb_log_file_size which is too small will trigger a "Row size too large error."
342
343 You can solve the problem by changing the innodb_log_file_size in the my.ini text file.
344 Find more details in the link below.
345 http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-20.html

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