{"id":7046,"date":"2018-12-07T16:16:00","date_gmt":"2018-12-07T15:16:00","guid":{"rendered":"https:\/\/www.carajandb.com\/?p=7046"},"modified":"2018-12-14T13:14:26","modified_gmt":"2018-12-14T12:14:26","slug":"oracle-18-xe-and-multitenant","status":"publish","type":"post","link":"https:\/\/carajandb.com\/en\/2018\/12\/07\/oracle-18-xe-and-multitenant\/","title":{"rendered":"Oracle 18 XE and Multitenant"},"content":{"rendered":"<p>As already mentioned in my blog &#8220;<a href=\"https:\/\/carajandb.com\/en\/blog\/2018\/oracle-18-xe-is-available\/\">Oracle 18 XE is available<\/a>&#8221; the\u00a0 XE version includes the multitenant database option. So you can create up to three pluggable databases. But in this case it doesn&#8217;t matter if it is an &#8220;ordinary&#8221; PDB, a Proxy PDB\u00a0 or an Application Root.<!--more-->If this is your first time dealing with the multitenant database Option I would advice to create datafiles as Oracle Managed Files (OMF) because with this the command <code>CREATE PLUGGABLE DATABASE<\/code> becomes much easier. Unfortunately per default XE is not using Oracle Managed Files.<\/p>\n<h3>Oracle Managed Files<\/h3>\n<p>Bevore you are going to start you should drop the already created pluggable database XEPDB1. You should gain experience with your own PDBs not by using the precreated ones:<\/p>\n<pre>SQL&gt; ALTER PLUGGABLE DATABASE xepdb1 CLOSE IMMEDIATE;\r\nSQL&gt; DROP PLUGGABLE DATABASE xepdb1 INCLUDING DATAFILES;\r\n<\/pre>\n<p>If you don&#8217;t care about the fact that not all datafiles are created as OMF I would recommend not to touch the CDB. In this case it&#8217;s sufficient to set the following parameter:<\/p>\n<pre>SQL&gt; ALTER SYSTEM SET db_create_file_dest='\/u02\/oradata';\r\n<\/pre>\n<p>Please make sure that the directory exists (but you probably already added that directory while creating the database). The variable shouldn&#8217;t include the name of the database as this name will be added automatically.<br \/>\nNow it&#8217;s time to create the first PDB:<\/p>\n<pre>SQL&gt; CREATE PLUGGABLE DATABASE suzanne \r\n      ADMIN USER pdbadmin IDENTIFIED BY manager\r\n      DEFAULT TABLESPACE users;\r\nSQL&gt; ALTER PLUGGABLE DATABASE suzanne OPEN;\r\nSQL&gt; ALTER PLUGGABLE DATABASE suzanne SAVE STATE;\r\n<\/pre>\n<p>That&#8217;s it!<br \/>\nAs always there is one constraint: you shouldn&#8217;t try to type the entry path of the OMF datafiles but using &#8220;Drag &amp; Drop&#8221; instead!<\/p>\n<pre>SQL&gt; ALTER SESSION SET \"_exclude_seed_cdb_view\"=FALSE;\r\nSQL&gt; SELECT p.name, d.tablespace_name, file_name\r\n       FROM cdb_data_files d, v$containers p\r\n      WHERE p.con_id = d.con_id\r\n      ORDER BY p.con_id,2\r\n\r\nNAME       TABLESPACE FILE_NAME\r\n---------- ---------- ------------------------------------------------------------------------------------------\r\nCDB$ROOT   SYSAUX     \/u02\/oradata\/XE\/sysaux01.dbf\r\nCDB$ROOT   SYSTEM     \/u02\/oradata\/XE\/system01.dbf\r\nCDB$ROOT   UNDOTBS1   \/u02\/oradata\/XE\/undotbs01.dbf\r\nCDB$ROOT   USERS      \/u02\/oradata\/XE\/users01.dbf\r\nPDB$SEED   SYSAUX     \/u02\/oradata\/XE\/pdbseed\/sysaux01.dbf\r\nPDB$SEED   SYSTEM     \/u02\/oradata\/XE\/pdbseed\/system01.dbf\r\nPDB$SEED   UNDOTBS1   \/u02\/oradata\/XE\/pdbseed\/undotbs01.dbf\r\nSUZANNE    SYSAUX     \/u02\/oradata\/XE\/7B913842A2980993E0530100007F3756\/datafile\/o1_mf_sysaux_fzqrrx65_.dbf\r\nSUZANNE    SYSTEM     \/u02\/oradata\/XE\/7B913842A2980993E0530100007F3756\/datafile\/o1_mf_system_fzqrrx5n_.dbf\r\nSUZANNE    UNDOTBS1   \/u02\/oradata\/XE\/7B913842A2980993E0530100007F3756\/datafile\/o1_mf_undotbs1_fzqrrx67_.dbf\r\n<\/pre>\n<p>The command <code>ALTER SESSION SET \"_exclude_seed_cdb_view\"=FALSE;<\/code> adds the datafiles of PDB$SEED to the result set. With version 12.1.0.2 Oracle decided that it&#8217;s not useful to show data belonging to PDB$SEED &#8211; you can have your own opinion on that.<\/p>\n<h3>PDBs and Services<\/h3>\n<p>Every PDB is creaded with an associated service. In our case the result of the command <code>lsnrctl status<\/code> is:<\/p>\n<pre>Services Summary...\r\nService \"7b913842a2980993e0530100007f3756\" has 1 instance(s).\r\n  Instance \"XE\", status READY, has 1 handler(s) for this service...\r\nService \"XE\" has 2 instance(s).\r\n  Instance \"XE\", status UNKNOWN, has 1 handler(s) for this service...\r\n  Instance \"XE\", status READY, has 1 handler(s) for this service...\r\nService \"XEXDB\" has 1 instance(s).\r\n  Instance \"XE\", status READY, has 1 handler(s) for this service...\r\nService \"suzanne\" has 1 instance(s).\r\n  Instance \"XE\", status READY, has 1 handler(s) for this service...\r\nThe command completed successfully\r\n<\/pre>\n<p>This service (suzanne) is, by the way, the reason why PDBs have to be uniquely named on the entire server. This shouldn&#8217;t be a problem with XE (as long as we don&#8217;t have a newer version) but with the multitenant database Option and multiple databases you should take care that you don&#8217;t have PDB naming duplicates.<br \/>\n<strong>As a best practice you shouldn&#8217;t use the default service in any case!<\/strong><br \/>\nThe recommendation is to have individual services for each task. In our case we will create a service for the application:<\/p>\n<pre>SQL&gt; ALTER SESSION SET CONTAINER=suzanne;\r\n\r\nSQL&gt; execute dbms_service.create_service('appl_suzanne','appl_suzanne');\r\n\r\nSQL&gt; execute dbms_service.start_service('appl_suzanne');\r\n\r\nSQL&gt; ALTER PLUGGABLE DATABASE SAVE STATE;\r\n<\/pre>\n<p>With the command <code>ALTER PLUGGABLE DATABASE SAVE STATE<\/code> you ensure that the service will be started automatically each time the instance is started. Unfortunately this doesn&#8217;t work if you close and open the pluggable database on its own. The application should now only use the service <code>appl_suzanne<\/code>.<\/p>\n<h3>PDB Cloning<\/h3>\n<p>You can of course copy or clone a PDB. The command is the easiest one:<\/p>\n<pre>SQL&gt; CREATE PLUGGABLE DATABASE marianne FROM suzanne;\r\n\r\nPluggable database created.\r\n\r\nSQL&gt; ALTER PLUGGABLE DATABASE marianne OPEN;\r\n\r\nPluggable database altered.\r\n<\/pre>\n<p>The result looks fine but there is a problem: The view <code>pdb_plug_in_violations<\/code> will show the details:<\/p>\n<pre>SQL&gt; SELECT name, cause, type message, status FROM pdb_plug_in_violations;\r\n\r\nNAME            CAUSE                          MESSAGE                                            STATUS\r\n--------------- ------------------------------ -------------------------------------------------- ---------\r\nMARIANNE        Service Name Conflict          WARNING                                            PENDING\r\n<\/pre>\n<p>The reason for this warning is that cloning will clone the service as well. So we need to take an action as explained in the view:<\/p>\n<pre>SQL&gt; SELECT action FROM pdb_plug_in_violations;\r\n\r\nACTION\r\n------------------------------------------------------------\r\nDrop the service and recreate it with an appropriate name.\r\n<\/pre>\n<p>Let&#8217;s go:<\/p>\n<pre>SQL&gt; ALTER SESSION SET CONTAINER=marianne;\r\n\r\nSQL&gt; SELECT name FROM dba_services;\r\n\r\nNAME\r\n---------------\r\nappl_suzanne\r\nMARIANNE\r\n\r\nSQL&gt; execute dbms_service.delete_service('appl_suzanne');\r\n\r\nSQL&gt; execute dbms_service.create_service('appl_marianne','appl_marianne');\r\n\r\nSQL&gt; execute dbms_service.start_service('appl_marianne');\r\n\r\nSQL&gt; ALTER PLUGGABLE DATABASE SAVE STATE;\r\n<\/pre>\n<h3>Limits<\/h3>\n<p>As said there are some limits comming with XE databases. You cannot create more than three pluggable databases regardless if they are opened or only mounted:<\/p>\n<pre>CREATE PLUGGABLE DATABASE hallelujah\r\n                          *\r\nERROR at line 1:\r\nORA-65010: maximum number of pluggable databases created\r\n<\/pre>\n<p>The second limitation is the amount of user data with 12 GByte. It doesn&#8217;t matter if this data is in one PDB or spreaded across multiple PDBs. While testing this I found that it doesn&#8217;t matter if the PDBs are opened or mounted.<\/p>\n<pre>SQL&gt; ALTER PLUGGABLE DATABASE leonard OPEN;\r\nALTER PLUGGABLE DATABASE leonard OPEN \r\n*\r\nERROR at line 1:\r\nORA-12954: The request exceeds the maximum allowed database size of 12 GB.\r\n<\/pre>\n<h3>Saving PDBs<\/h3>\n<p>But what can you do if a PDB is reaching this border and you need to create an additional PDB? It&#8217;s very simple: you close the PDB, create a manifest (that&#8217;s an XML-File with the definition of the PDB) and drop the PDB. Dont be afraid for the saved data I&#8217;ll explain how to restore it with minimal effort.<\/p>\n<pre>SQL&gt; ALTER PLUGGABLE DATABASE leonard CLOSE IMMEDIATE;\r\nSQL&gt; ALTER PLUGGABLE DATABASE leonard UNPLUG INTO '\/home\/oracle\/leonard.xml';\r\nSQL&gt; DROP PLUGGABLE DATABASE leonard;\r\n<\/pre>\n<p>Please ensure that you don&#8217;t use <code>INCLUDING CONTENTS<\/code> with the command <code>DROP PLUGGABLE DATABASE<\/code> &#8211; otherwise your PDB is dropped irreversably. But you have a backup do you?<br \/>\nNow you can create new PDBs and use them. If you need the big PDB later on you drop the newly created PDBs and reuse the original one:<\/p>\n<pre>SQL&gt; CREATE PLUGGABLE DATABASE leonard USING '\/home\/oracle\/leonard.xml' NOCOPY;\r\nSQL&gt; ALTER PLUGGABLE DATABASE leonard OPEN;\r\nSQL&gt; ALTER PLUGGABLE DATABASE leonard SAVE STATE;\r\n<\/pre>\n<h3>Conclusion<\/h3>\n<p>This was the first impression on multitenant database in XE. But the examples will work for Enterprise Edition as well. Without the XE limitations of course.<br \/>\nIf you have any questions or comments feel free to write a blog comment or drop an mail at <a href=\"mailto:info@carajandb.com\">info@carajandb.com<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As already mentioned in my blog &#8220;Oracle 18 XE is available&#8221; the\u00a0 XE version includes the multitenant database option. So you can create up to three pluggable databases. But in this case it doesn&#8217;t matter if it is an &#8220;ordinary&#8221; PDB, a Proxy PDB\u00a0 or an Application Root.<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_crdt_document":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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