Just now i find out very interesting concept in Architecture.
When instance starts, all background process related to read/write with database (DBWR & LGWR) will read redolog files and data files while opening the database. actually this used to happen in oracle 6.0 in which there is no CKPT process and LGWR used to perform checkpoint at that time. after that even though oracle changed and introduced CKPT, still in 10g also LGWR reads datafiles while opening the database.
For more information read following link.
http://forums.oracle.com/forums/thread.jspa?messageID=2631627�
When instance starts, all background process related to read/write with database (DBWR & LGWR) will read redolog files and data files while opening the database. actually this used to happen in oracle 6.0 in which there is no CKPT process and LGWR used to perform checkpoint at that time. after that even though oracle changed and introduced CKPT, still in 10g also LGWR reads datafiles while opening the database.
For more information read following link.
http://forums.oracle.com/forums/thread.jspa?messageID=2631627�
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