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Dec 31, 2013

Buffer Aging , LRU Lists,Dirty List & DBWR

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All Oracle data is obtained by users from the buffer cache.The basic purpose of the cache is to minimize physical disk I/O by holding (buff...

PGA & SGA

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PGA stands for Process Global Area which is also known as Program Global Area. It is called global area because is keeps information which...
Dec 20, 2013

Row chaining & Migration

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ANALYZE TABLE {BAD_TABLE} LIST CHAINED ROWS INTO {MY_CHAINING_TABLE}; For More Reference

PCTFREE , PCTUSED ,INITRANS & MAXTRANS

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       The datafiles are the physical storage space on the server. Storage in the datafiles is allocated by blocks to each extent that is u...

Oracle Managed Datafiles (OMFs)

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Oracle introduced Oracle Managed Files (OMF) concept in Oracle 9i. OMFs simplify the administration task of an Oracle Database. Oracle man...
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