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1 {{box cssClass="floatinginfobox" title="**Contents**"}}
2 {{toc/}}
3 {{/box}}
5 = Installation steps =
7 == Local install ==
9 * Download and install a version of Oracle Database. For example [[Oracle Express or Oracle Standard Edition>>]].
10 * Download the corresponding [[Oracle JDBC Drivers>>]] and copy the JAR (e.g. ##ojdbc8.jar## in ##WEB-INF/lib/##)
11 * Start Oracle and connect to it with a DBA or system user. For example use the Oracle SQL*Plus command-line tool: {{code}}connect system;{{/code}}
12 * Create the user for the main wiki:(((
13 {{code language='sql'}}
14 create user xwiki
15 identified by xwiki;
16 {{/code}}
17 )))
18 * (Optional) Create a tablespace (files to hold database data). This is optional as Oracle provides a default ##USERS## tablespace which is used when you create a user as above without specifying a tablespace:(((
19 * List existing tablespaces:(((
20 {{code language='sql'}}
21 select * from dba_data_files;
22 {{/code}}
23 )))
24 * Create an ##xwiki## tablespace (adjust the `datafile` path by checking from the listed existing tablespaces), giving it enough space, and then make sure that the ##XWIKI## user uses it:(((
25 * Create the custom tablespace:(((
26 {{code language='sql'}}
27 create tablespace xwiki
28 datafile '/opt/<SOMETHING>/oracle/oradata/<SID>/<PDB>/xwiki01.dbf'
29 size 1m
30 autoextend on
31 maxsize 1g
32 ;
33 {{/code}}
34 )))
35 * Modify the ##XWIKI## user to use it, and make sure it has quotas on it (by default it doesn't):(((
36 {{code language='sql'}}
37 alter user xwiki
38 default tablespace xwiki
39 temporary tablespace temp
40 ;
41 alter user xwiki quota unlimited on xwiki
42 ;
43 {{/code}}
44 )))
45 )))
46 * If you use the default ##USERS## tablespace you may still want to make it large enough. For example:(((
47 {{code language='sql'}}
48 alter database datafile '/opt/<SOMETHING>/oradata/<SID>/<PDB>/users01.dbf' resize 100M;
49 {{/code}}
50 )))
51 )))
52 * Give sufficient privileges to the ##XWIKI## user:(((
53 {{code language='sql'}}
54 grant connect to xwiki;
55 grant resource to xwiki;
56 grant dba to xwiki;
57 {{/code}}
58 )))
59 * Tell XWiki to use Oracle. To do this, edit the ##WEB-INF/hibernate.cfg.xml## file where you have expanded the XWiki WAR file and uncommented the Oracle part. Make sure to review the ##connection.url## property. For example a typical Oracle Express would be:{{code}}<property name="connection.url">jdbc:oracle:thin:@localhost:1521:<SID></property>{{/code}}(((
60 {{info}}
61 **XE** is the default name of the ORACLE SID created by default by the installation for Oracle Express. If it is another you should change it. You can find the correct SID in ##app/oracle/product/10.2.0/server/NETWORK/ADMIN/tnsnames.ora## in the Oracle installation directory (for Windows).
62 {{/info}}
63 )))
65 == From a VM ==
67 An easy to test Oracle is to use a VM. Here are some easy steps:
69 * [[Download the VM from the Oracle web site>>]]
70 * Install [[VirtualBox>>]] and import the VM in it
71 * Note: I had to configure the VM network settings to use the "Bridged Adapter" instead of "NAT" in order to be able see it from my host machine
72 * Start the VM and log in as ##oracle##/##oracle##
73 * Note that IP address printed in the shell that opens up, for example:
74 * In the shell, starts the manager: ##emctl start dbconsole##
75 * Execute all the instructions above in the shell to create the ##xwiki## database (don't forget to download the JDBC driver and put it in ##WEB-INF/lib##). Tip: Put the following in a file (for example ##xwiki.sql## located on the Desktop) and execute {{code}}echo @Desktop/xwiki.sql | sqlplus system/[email protected]{{/code}}:(((
76 {{code language='sql'}}
77 drop user xwiki cascade;
78 create user xwiki identified by xwiki;
79 select * from dba_data_files;
80 create tablespace xwiki datafile '/home/oracle/app/oracle/oradata/orcl/xwiki01.dbf' size 1m autoextend on maxsize 1g;
81 alter user xwiki default tablespace xwiki temporary tablespace temp;
82 alter user xwiki quota unlimited on xwiki;
83 grant create session to xwiki;
84 grant create table to xwiki;
85 grant create sequence to xwiki;
86 {{/code}}
87 )))
88 * From your host machine, point your browser on http:~/~/ and connect as ##system/oracle##
89 * In your XWiki's ##hibernate.cfg.xml##, use:(((
90 {{code language='xml'}}
91 <property name="connection.url">jdbc:oracle:thin:@</property>
92 {{/code}}
93 )))
94 * Don't forget to drop the Oracle JDBC driver in your ##WEB-INF/lib## directory!
95 * Enjoy ;)
97 == Using Docker ==
99 Follow these steps:
100 * Start Oracle: {{code language='none'}}docker run --name oracle-xwiki -d -p 1521:1521 -v [<host mount point>:]/opt/oracle/oradata xwiki/oracle-database:19.3.0-se2{{/code}}
101 * Download the corresponding [[JDBC driver>>]] and put it in XWiki's ##WEB-INF/lib## directory
102 * Edit XWiki's ##hibernate.cfg.xml## file, comment out the Oracle section and make sure you use the following settings:(((
103 {{code language='xml'}}
104 <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521/xwiki</property>
105 <property name="hibernate.connection.username">xwiki</property>
106 <property name="hibernate.connection.password">xwiki</property>
107 {{/code}}
108 )))
110 And if you need to execute some SQL command you can do the following:
111 * Connect inside the docker container with: {{code language='shell'}}docker -it exec <container id> bash -l{{/code}}
112 * Run ##sqplplus## with one of:
113 ** {{code language='sql'}}sqlplus system/[email protected]//localhost:1521/XWIKI{{/code}} to execute commands in the XWiki PDB
114 ** {{code language='sql'}}sqlplus sys/[email protected]//localhost:1521/XWIKICDB as sysdba{{/code}} if you need to execute commands in the CDB
116 {{info}}
117 You can check [[how the XWiki Oracle docker image is built>>]].
118 {{/info}}
120 = Multi wiki support =
122 {{version since='12.8RC1'}}
123 When creating a (sub)wiki, XWiki will create a new Oracle user using the equivalent of:
125 {{code language='sql'}}
128 {{/code}}
130 Notes:
131 * The default ##USERS## tablespace is used. Thus make sure that this tablespace is large enough. You may need to execute:(((
132 {{code language='sql'}}
133 alter database datafile '/opt/<SOMETHING>/oradata/<SID>/<PDB>/users01.dbf' resize 100M;
134 {{/code}}
135 )))
136 {{/version}}
138 = Indexes =
140 See [[Database Administration>>Documentation.AdminGuide.Performances.Database Administration.WebHome]].
142 {{code}}
144 create index xwd_parent on xwikidoc (xwd_parent) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
145 create index xwd_class_xml on xwikidoc (xwd_class_xml) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
146 create index ase_page_date on activitystream_events (ase_page, ase_date);
147 create index xda_docid1 on xwikiattrecyclebin (xda_docid);
148 create index ase_param1 on activitystream_events (ase_param1) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
149 create index ase_param2 on activitystream_events (ase_param2) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
150 create index ase_param3 on activitystream_events (ase_param3) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
151 create index ase_param4 on activitystream_events (ase_param4) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
152 create index ase_param5 on activitystream_events (ase_param5) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (ON COMMIT)');
153 {{/code}}
155 = Troubleshooting =
157 == ORA-01400: cannot insert NULL into ("XWIKI"."XWIKILARGESTRINGS"."XWL_ID") ==
159 This error can appear if you're using Oracle JDBC driver The solution is to use version or greater of the driver.
161 == SetString can only process strings of less than 32766 chararacters ==
163 If you see an error that says something like this:
165 {{code}}
166 Error number 3201 in 3: Exception while saving document XWiki.XWikiPreferences
167 Wrapped Exception: could not update: [com.xpn.xwiki.doc.XWikiDocumentArchive#104408758]
168 com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document XWiki.XWikiPreferences
169 Wrapped Exception: could not update: [com.xpn.xwiki.doc.XWikiDocumentArchive#104408758]
170 ...
171 Wrapped Exception:
173 java.sql.SQLException: setString can only process strings of less than 32766 chararacters
174 ...
175 {{/code}}
177 Then that's because Oracle has a limitation of 32K for CLOBs. To overcome it you need to add the following 2 properties in the ##hibernate.cfg.xml## file, as specified in the installation steps section above:
179 {{code}}
180 <property name="hibernate.connection.SetBigStringTryClob">true</property>
181 <property name="hibernate.jdbc.batch_size">0</property>
182 {{/code}}
184 == NullPointerException at HqlSqlWalker ==
186 This is actually caused by a wrong Oracle ##ojdbc## JAR being used. There are different JARs for every different minor version of Oracle. For example if you use the JDBC connector for Oracle 11g version and your Oracle db version is then you'll have the problem.
188 == Errors due to missing RAM ==
190 If you see one of the following errors in the XWiki logs, it may simply be that you don't allocate enough RAM to Oracle. This is especially true if you're running it in a VM or in a Docker Container. For example we know that 2GB is not enough for Oracle and 2.5GB+ is ok.
192 {{code language='none'}}
193 SQL Error: 0, SQLState: null
194 Cannot get a connection, pool error Timeout waiting for idle object
195 ORA-12519, TNS:no appropriate service handler found
196 ORA-01435: user does not exist
197 {{/code}}
199 Note that it's possible to have these errors for other reasons too but you should at least check that the RAM is enough.

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