{"id":3892,"date":"2023-12-01T07:00:00","date_gmt":"2023-12-01T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=3892"},"modified":"2024-02-04T21:48:51","modified_gmt":"2024-02-04T18:48:51","slug":"pos-allazoyme-to-onoma-toy-user-schema-se-mia-va","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/pos-allazoyme-to-onoma-toy-user-schema-se-mia-va\/","title":{"rendered":"How do we change the name of the user \/ schema in an Oracle database"},"content":{"rendered":"<p>Using one <strong>Oracle Database<\/strong> we may at some point need to rename a user and a schema. Until version 11g this was not possible and we had to create a new user and export\/import with <em>remap_schema<\/em>. However, we can now rename the usage after first activating a parameter. In this article we will see how it is done step by step. <\/p>\n\n\n\n<p>First, we connect to the database with sqlplus:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">[oracle@dp-gr ~]$ sqlplus \/ as sysdba<\/pre>\n\n\n\n<p>Then we run the following command to enable the parameter on the next restart of the instance:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">alter system set \"_enable_rename_user\"=true scope=spfile;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>System altered<\/code><\/pre>\n\n\n\n<p>We stop the instance:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">shutdown immediate;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>Database closed.\nDatabase dismounted.\nORACLE instance shut down.<\/code><\/pre>\n\n\n\n<p>We start the instance in restricted mode (only sysdba user can connect):<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">startup restrict;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>ORACLE instance started.\n\nTotal System Global Area  411041792 bytes\nFixed Size                  2925024 bytes\nVariable Size             327159328 bytes\nDatabase Buffers           75497472 bytes\nRedo Buffers                5459968 bytes\nDatabase mounted.\nDatabase opened.<\/code><\/pre>\n\n\n\n<p>In our example we want the user \/schema \u201c<em>stratos&quot; <\/em>let&#039;s change it to &quot;<em>Nikos<\/em>&quot;. If we now run a select on a table belonging to it we will see that it will allow results:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">select * from stratos.dept;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>    DEPTNO DNAME          LOC\n---------- -------------- -------------\n        10 ACCOUNTING     NEW YORK\n        20 RESEARCH       DALLAS\n        30 SALES          CHICAGO\n        40 OPERATIONS     FLORIDA\n<\/code><\/pre>\n\n\n\n<p>We run the command below that changes the name:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">alter user stratos rename to nikos identified by \"kwdikos\";<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>\nUser altered.\n<\/code><\/pre>\n\n\n\n<p><strong>In case it shows us an error<\/strong> and it won&#039;t let us change the username, we can try the following instead of the previous command:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">update sys.user$ set name= 'nikos' where name = 'stratos';\ncommit;\n\nalter user stratos identified by \"kwdikos\";\n\nshutdown immediate;\n\nstartup restrict;<\/pre>\n\n\n\n<p>If we run the same select again, we will see that it says that the table does not exist:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">select * from stratos.dept;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>select * from stratos.dept\n                      *\nERROR at line 1:\nORA-00942: table or view does not exist<\/code><\/pre>\n\n\n\n<p>If we run it under the schema \u201c<em>Nikos<\/em>\u201d but we will see that the change has been completed and the select returns results normally:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">select * from nikos.dept;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>    DEPTNO DNAME          LOC\n---------- -------------- -------------\n        10 ACCOUNTING     NEW YORK\n        20 RESEARCH       DALLAS\n        30 SALES          CHICAGO\n        40 OPERATIONS     FLORIDA<\/code><\/pre>\n\n\n\n<p>To open the database so that it is accessible to all users, we run the following:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">alter system disable restricted session;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>\nSystem altered.<\/code><\/pre>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Using an Oracle Database we may at some point need to change the name of a user and a schema. Until version 11g this was not possible and we would have to create a new user and export\/import with remap_schema. However, we can now rename the usage after first activating a parameter. In this article [\u2026]<\/p>","protected":false},"author":1,"featured_media":704,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,16],"tags":[29,5,30],"class_list":["post-3892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-databases","category-oracle-db","tag-databases","tag-oracle-database","tag-rdbms"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u03a0\u03ce\u03c2 \u03b1\u03bb\u03bb\u03ac\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf \u03cc\u03bd\u03bf\u03bc\u03b1 \u03c4\u03bf\u03c5 user \/ schema \u03c3\u03b5 \u03bc\u03af\u03b1 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c4\u03b7\u03c2 Oracle - DataPlatform.gr<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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