{"id":4386,"date":"2022-03-30T08:00:00","date_gmt":"2022-03-30T05:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=4386"},"modified":"2023-10-03T20:24:20","modified_gmt":"2023-10-03T17:24:20","slug":"pos-epanaferoyme-enan-pinaka-se-sygke","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/pos-epanaferoyme-enan-pinaka-se-sygke\/","title":{"rendered":"How to restore a table to a point in time in Oracle Database with RMAN"},"content":{"rendered":"<p>In this article we will see how in Oracle Database we can restore a table at a specific time. The data to perform the process comes from  <strong>RMAN backups<\/strong> and during the process they are temporarily restored automatically to a clone of the database (auxiliary database).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u03c4\u03b1-\u03c0\u03c1\u03bf\u03b1\u03c0\u03b1\u03b9\u03c4\u03bf\u03cd\u03bc\u03b5\u03bd\u03b1\">The prerequisites<\/h2>\n\n\n\n<p>The database should be located at <strong>Archive Log Mode<\/strong>, if it is not found, connect from a terminal with the oracle user (with which the Oracle Database has been installed):<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>sqlplus \/ as sysdba<\/code><\/pre>\n\n\n\n<p>To make the change you will need to restart the database by running 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=\"\">shutdown immediate;\n\nalter database archivelog mode;\n\nstartup;<\/pre>\n\n\n\n<p>We should also be application aware <strong>RMAN database backups<\/strong> and keep them <strong>Archive Logs<\/strong>.<\/p>\n\n\n\n<p>We connect to RMAN:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>rman target \/\n<\/code><\/pre>\n\n\n\n<p>To get the backup of the database we run the following:<\/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=\"\">backup database;\n<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"923\" height=\"333\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_00.png\" alt=\"\" class=\"wp-image-4376\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_00.png 923w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_00-300x108.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_00-768x277.png 768w\" sizes=\"auto, (max-width: 923px) 100vw, 923px\" \/><figcaption class=\"wp-element-caption\">01<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u03c4\u03bf-\u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1\">The example<\/h2>\n\n\n\n<p>For example we have created a tablespace, we have given permission to the user to write to this tablespace and we have created a table with some records in it:<\/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=\"\">CREATE TABLESPACE corrupt_ts \n   DATAFILE '\/oracle\/app\/oracle\/oradata\/ORACLEDB\/datafile\/corrupt_ts_data1.dbf'size 10m autoextend on next 64m maxsize 32767m,\n   '\/oracle\/app\/oracle\/oradata\/ORACLEDB\/datafile\/corrupt_ts_data2.dbf'size 10m autoextend on next 64m maxsize 32767m;\n\nALTER USER stratos quota unlimited on CORRUPT_TS;\n\nCREATE TABLE stratos.users(\n   id INT GENERATED ALWAYS AS IDENTITY, \n   username VARCHAR2(50)\n) TABLESPACE corrupt_ts;\n\n\ninsert into stratos.users (username) values ('Stratos');\ninsert into stratos.users (username) values ('Giorgos');\ninsert into stratos.users (username) values ('Nikos');\ninsert into stratos.users (username) values ('Vasilis');\ncommit;<\/pre>\n\n\n\n<p>We check to see that the table contains the entries:<\/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.users;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"528\" height=\"143\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_02.png\" alt=\"\" class=\"wp-image-4378\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_02.png 528w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_02-300x81.png 300w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><figcaption class=\"wp-element-caption\">02<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u03c0\u03ce\u03c2-\u03b5\u03c0\u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03bf\u03c5\u03bc\u03b5-\u03c4\u03bf\u03bd-\u03c0\u03af\u03bd\u03b1\u03ba\u03b1-\u03c3\u03b5-\u03bc\u03af\u03b1-\u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03b7-\u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03ae-\u03c3\u03c4\u03b9\u03b3\u03bc\u03ae\">How do we reset the table to a specific point in time<\/h3>\n\n\n\n<p>Let&#039;s say that someone has run a query and updated all the entries in the table with a wrong value:<\/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 stratos.users set username='Oups!!';\ncommit;<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u03c0\u03ce\u03c2-\u03b5\u03c0\u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03bf\u03c5\u03bc\u03b5-\u03c4\u03bf\u03bd-\u03c0\u03af\u03bd\u03b1\u03ba\u03b1-\u03bc\u03b5-\u03ad\u03bd\u03b1-\u03ac\u03bb\u03bb\u03bf-\u03cc\u03bd\u03bf\u03bc\u03b1\">How do we restore the table with another name<\/h3>\n\n\n\n<p>We connect to <strong>RMAN<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>rman target \/<\/code><\/pre>\n\n\n\n<p>And we do <strong>recover<\/strong> the table at a specific time:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>As <strong>auxiliary destination<\/strong> we define the space where a clone of the database will be temporarily created until the process is complete.<\/li>\n\n\n\n<li>By command <strong>remap table<\/strong> we set it to bring the table with another name.<\/li>\n<\/ul>\n\n\n\n<p><\/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=\"\">RECOVER TABLE stratos.users\n  UNTIL TIME \"TO_DATE('08-02-2022 14:23', 'DD-MM-YYYY HH24:MI')\"\n  AUXILIARY DESTINATION '\/oracle\/app\/oracle\/oradata\/AUX\/'\n  REMAP TABLE stratos.users:stratos.users2;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"781\" height=\"624\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_02.png\" alt=\"\" class=\"wp-image-4388\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_02.png 781w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_02-300x240.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_02-768x614.png 768w\" sizes=\"auto, (max-width: 781px) 100vw, 781px\" \/><figcaption class=\"wp-element-caption\">03<\/figcaption><\/figure>\n\n\n\n<p>As soon as the process is completed, we will see that the table has returned with the new 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=\"\">select * from stratos.users2;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"478\" height=\"212\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_03.png\" alt=\"\" class=\"wp-image-4389\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_03.png 478w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_03-300x133.png 300w\" sizes=\"auto, (max-width: 478px) 100vw, 478px\" \/><figcaption class=\"wp-element-caption\">04<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u03c0\u03ce\u03c2-\u03b5\u03c0\u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03bf\u03c5\u03bc\u03b5-\u03c4\u03bf\u03bd-\u03c0\u03af\u03bd\u03b1\u03ba\u03b1-\u03bc\u03b5-\u03c4\u03bf-\u03af\u03b4\u03b9\u03bf-\u03cc\u03bd\u03bf\u03bc\u03b1\">How do we restore the table with the same name<\/h3>\n\n\n\n<p>We can replace the table directly after first deleting the old one:<\/p>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>sqlplus \/ as sysdba<\/code><\/pre>\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=\"\">drop table stratos.users;<\/pre>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code>rman target \/<\/code><\/pre>\n\n\n\n<p>And we do <strong>recover<\/strong> the table at a specific time:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>As <strong>auxiliary destination<\/strong> we define the space where a clone of the database will be temporarily created until the process is complete.<\/li>\n<\/ul>\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=\"\">RECOVER TABLE stratos.users\n  UNTIL TIME \"TO_DATE('08-02-2022 16:00', 'DD-MM-YYYY HH24:MI')\"\n  AUXILIARY DESTINATION '\/oracle\/app\/oracle\/oradata\/AUX\/';<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"785\" height=\"612\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_06.png\" alt=\"\" class=\"wp-image-4392\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_06.png 785w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_06-300x234.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_06-768x599.png 768w\" sizes=\"auto, (max-width: 785px) 100vw, 785px\" \/><figcaption class=\"wp-element-caption\">05<\/figcaption><\/figure>\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.users;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"528\" height=\"143\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_02.png\" alt=\"\" class=\"wp-image-4378\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_02.png 528w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rdf_02-300x81.png 300w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><figcaption class=\"wp-element-caption\">06<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u03c0\u03ce\u03c2-\u03b5\u03be\u03ac\u03b3\u03bf\u03c5\u03bc\u03b5-\u03c4\u03bf\u03bd-\u03c0\u03af\u03bd\u03b1\u03ba\u03b1-\u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03b7\u03c2-\u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03ae\u03c2-\u03c3\u03c4\u03b9\u03b3\u03bc\u03ae\u03c2-\u03c3\u03b5-export-dump-file\">How to export point in time table to Export Dump File<\/h3>\n\n\n\n<p>We can do <strong>recover<\/strong> the table at a specific point in time, not in the database but in a <strong>export dump file<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>As <strong>auxiliary destination<\/strong> we define the space where a clone of the database will be temporarily created until the process is complete.<\/li>\n\n\n\n<li>As datapump destination we define the location where the dump file will be exported.<\/li>\n\n\n\n<li>As dump file we define the name of the export dump file.<\/li>\n\n\n\n<li>With notableimport we only set the table to be searched in the export dump file and not imported.<\/li>\n<\/ul>\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=\"\">RECOVER TABLE stratos.users\n  UNTIL TIME \"TO_DATE('08-02-2022 15:40', 'DD-MM-YYYY HH24:MI')\"\n  AUXILIARY DESTINATION '\/oracle\/app\/oracle\/oradata\/AUX\/'\n  DATAPUMP DESTINATION '\/home\/oracle\/Documents'\n  DUMP FILE 'users.dmp'\n  NOTABLEIMPORT;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"781\" height=\"679\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_05.png\" alt=\"\" class=\"wp-image-4391\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_05.png 781w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_05-300x261.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_05-768x668.png 768w\" sizes=\"auto, (max-width: 781px) 100vw, 781px\" \/><figcaption class=\"wp-element-caption\">07<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u03c0\u03ce\u03c2-\u03b5\u03c0\u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03bf\u03c5\u03bc\u03b5-\u03bf\u03bb\u03cc\u03ba\u03bb\u03b7\u03c1\u03bf-\u03c4\u03bf-tablespace-\u03c3\u03b5-\u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03b7-\u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03ae-\u03c3\u03c4\u03b9\u03b3\u03bc\u03ae\">How do we reset the entire tablespace to a specific point in time<\/h3>\n\n\n\n<p>We can do <strong>recover<\/strong> the entire tablespace at a specific point in time:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>As <strong>auxiliary destination<\/strong> we define the space where a clone of the database will be temporarily created until the process is complete.<\/li>\n<\/ul>\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=\"\">RECOVER TABLESPACE corrupt_ts\n  UNTIL TIME \"TO_DATE('08-02-2022 14:23', 'DD-MM-YYYY HH24:MI')\"\n  AUXILIARY DESTINATION '\/oracle\/app\/oracle\/oradata\/AUX\/';<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"790\" height=\"773\" src=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_04.png\" alt=\"\" class=\"wp-image-4390\" srcset=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_04.png 790w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_04-300x294.png 300w, https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2022\/02\/rtt_04-768x751.png 768w\" sizes=\"auto, (max-width: 790px) 100vw, 790px\" \/><figcaption class=\"wp-element-caption\">08<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u03c0\u03b7\u03b3\u03ad\u03c2\">Sources:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.oracle.com\/database\/121\/BRADV\/rcmresind.htm#BRADV686\" target=\"_blank\" rel=\"noreferrer noopener\">Recovering Tables and Table Partitions from RMAN Backups<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.oracle.com\/cd\/E11882_01\/backup.112\/e10642\/rcmtspit.htm#BRADV009\" target=\"_blank\" rel=\"noreferrer noopener\">Performing RMAN Tablespace Point-in-Time Recovery (TSPITR)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.oracle.com\/cd\/E18283_01\/backup.112\/e10642\/rcmquick.htm\" target=\"_blank\" rel=\"noreferrer noopener\">Getting Started with RMAN<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.oracle.com\/ocom\/groups\/public\/@otn\/documents\/webcontent\/283263.htm\" target=\"_blank\" rel=\"noreferrer noopener\">Changing the Database Archiving Mode<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>In this article we will see how in Oracle Database we can restore a table at a specific time. The data to carry out the process comes from RMAN backups and during the process they are temporarily restored automatically to a clone of the database (auxiliary database). Prerequisites The database must be located [...]<\/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":[29,5,30,165,80],"class_list":["post-4386","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-databases","category-oracle-db","tag-databases","tag-oracle-database","tag-rdbms","tag-recovery","tag-rman"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u03a0\u03ce\u03c2 \u03b5\u03c0\u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03bf\u03c5\u03bc\u03b5 \u03ad\u03bd\u03b1\u03bd \u03c0\u03af\u03bd\u03b1\u03ba\u03b1 \u03c3\u03b5 \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf \u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03cc \u03c3\u03b7\u03bc\u03b5\u03af\u03bf \u03c3\u03b5 Oracle Database \u03bc\u03b5 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