Category: Oracle

PURPOSE This article is a step by step demonstration on how to use the Oracle10g SQLAccess Advisor (DBMS_ADVISOR) package to get recommendations on what Materialized Views to create in order to support a given set of queries (a workload) issued on the database. The workload is imported from the Oracle10g Automatic Workload Repository using a…

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Checked for relevance on 12-May-2008. Clarification/Explanation ========================== The query optimizer can sometimes produce inaccurate estimates about an attribute of a statement due to lack of information,leading to poor execution plans. Traditionally, users have corrected this problem by manually adding hints to the application code to guide the optimizer into making correct decisions. For packaged applications,…

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Temporary Tablespace (1) The DEFAULT TEMPORARY TABLESPACE must be of TEMPORARY type. (2) The DEFAULT TEMPORARY TABLESPACE cannot be converted to PERMANENT once it has been defined as the DEFAULT TEMPORARY TABLESPACE. (3) Before dropping the DEFAULT TEMPORARY TABLESPACE, create another one. (4) The DEFAULT TEMPORARY TABLESPACE cannot be taken OFFLINE: (5) The temporary tablespace…

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Step-1 Run @temp_use.sql as following. Following is the code for temp_use.sql SELECT b.TABLESPACE, b.segfile#, b.segblk#, b.blocks, a.SID, a.serial#, a.username, a.osuser, a.status, c.sql_text FROM v$session a, v$sort_usage b, v$sqlarea c WHERE a.saddr = b.session_addr AND a.SQL_HASH_VALUE = c.HASH_VALUE and a.sid not in (select distinct sid from v$mystat) ORDER BY b.TABLESPACE, b.segfile#, b.segblk#, b.blocks / set pagesize…

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Find long running transaction that are running for more than 5 minutes with transaction id. col machine format a30 col sid format 99999 col Transaction_id format a20 col username format a10 col days format 99.99 col minutes format 999999 set lines 120 pages 200 select a.sid, a.username, a.machine, round((sysdate – to_date(b.start_time, ‘MM/DD/YY HH24:MI:SS’)) * 1440)…

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Notes on v$transaction The information here contains the view description from the Oracle9i documentation Earlier versions of Oracle may not include all columns. The v$transaction view lists the active transactions in the system. Column Datatype Description ————- ————– ————————————– ADDR RAW(4) Address of transaction state object XIDUSN NUMBER Undo segment number XIDSLOT NUMBER Slot number…

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