{"id":904,"date":"2008-10-13T12:40:48","date_gmt":"2008-10-13T16:40:48","guid":{"rendered":"http:\/\/onlineappsdba.com\/index.php\/2008\/10\/13\/validating-and-rebuilding-large-and-fragmented-indexes-in-11i\/"},"modified":"2008-10-13T12:42:33","modified_gmt":"2008-10-13T16:42:33","slug":"validating-and-rebuilding-large-and-fragmented-indexes-in-11i","status":"publish","type":"post","link":"https:\/\/onlineappsdba.com\/index.php\/2008\/10\/13\/validating-and-rebuilding-large-and-fragmented-indexes-in-11i\/","title":{"rendered":"Validating and rebuilding large and fragmented indexes in 11i"},"content":{"rendered":"<p>You can have various methods to identify the <strong>large<\/strong> or <strong>fragmented indexes<\/strong> in 11i or you can just configure the <strong>Oracle Alert<\/strong> to receive a mail. This alert is scheduled to check the situation periodically say daily at mid night.<\/p>\n<p>The alert &#8216;<strong>Indexes too large or fragmented<\/strong>&#8216; is pre-defined alert.<br \/>\n<strong>There are three possible ways to rebuild indexes<\/strong> :<br \/>\n<strong>i)<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Using <strong>ALTER INDEX ..REBULD ONLINE<\/strong> command<br \/>\n<strong>ii)<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Taking an export of database specifying <strong>ROWS=NO<\/strong> and then using the import with option <strong>INDEXFILE<\/strong><br \/>\n<strong>iii)<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0Using <strong>bde_rebuild.sql<\/strong><br \/>\nI would prefer the last method. You can download the <strong>bde_rebuild.sql<\/strong>script from metalink doc id <strong>182699.1<\/strong>. Run this script in 11i instance using <strong>apps<\/strong> or <strong>system<\/strong> account\u00a0<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 $<strong>SQLPLUS apps\/apps @bde_rebuild.sql<br \/>\n<\/strong><br \/>\n\u00a0<br \/>\nThis script will dynamically analyze and generates <strong>bde_rebuild_indexes.sql<\/strong> which rebuilds the required indexes.<\/p>\n<p>Execution of this script have some <strong>optional parameters<\/strong> which script will ask when you run it:<br \/>\n&#8212;\u00a0\u00a0<strong>Owner of table<\/strong> (schema) &lt;optional&gt; : applsys (for example)<br \/>\n&#8212; \u00a0<strong>Table name<\/strong> :<br \/>\n&#8212;\u00a0\u00a0<strong>Index name<\/strong> or <strong>Index Suffix<\/strong>\u00a0<br \/>\n&#8212;\u00a0\u00a0<strong>Threshold<\/strong> between 20 and 80% :\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for this parameter default value is 50 which is sufficient for OLTP environment<br \/>\nI would prefer to run the script for required schema (identify required schema from alert) separately for every schema.<\/p>\n<p><strong>The only care to be taken while running this script is<\/strong> : This script <strong>blocks DML<\/strong> commands on indexes being analyzed, including SELECT statements.<\/p>\n<p>Execute in Production during a low online user activity period. Blocking time lasts between few Sec to a few minutes, depending on index size.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You can have various methods to identify the large or fragmented indexes in 11i or you can just configure the 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