http://www.allinterview.com Top Architecture Interview Questions en-us http://www.allinterview.com/showanswers/3272.html pmon, smon, dbwr, lgwr, ckpt, arch, disp,cjq and more... http://www.allinterview.com/showanswers/3315.html this contains the commited and uncommited data stored in rollback table space prior to 9i. in 9i, it is called as undo table space. http://www.allinterview.com/showanswers/3319.html Database buffer is part of SGA, Which it is contain oracle blocks copied from datafile and modification carried in this area. In oracle 9i BUFFER CACHE is divided into three parts buffer_cache, buffer_keep_cache,buffer_recycle_cahce. THANKS http://www.allinterview.com/showanswers/3316.html this can be monitored in DB_data_files http://www.allinterview.com/showanswers/61882.html select sid from v$mystat where rownum=1; http://www.allinterview.com/showanswers/61870.html show sga It shows : Total System Global Area 135338868 bytes Fixed Size 453492 bytes Variable Size 109051904 bytes Database Buffers 25165824 bytes Redo Buffers 667648 bytes http://www.allinterview.com/showanswers/3312.html when ever the buffer cache is crashed, the transactions present in the buffer cache is lost. this can be recovered by the redo log buffer, which contains all the transactions present in the buffer cache http://www.allinterview.com/showanswers/3313.html A oracle block divided into three parts. block header,pctfree,pctused. block header :its contain the information datafiles. pctfree: its a free space in a datablock for updation and insertion of a row.default is 10% of a block size.one m http://www.allinterview.com/showanswers/3318.html OPTIMAL parameter is used to set the optimal length of a rollback segment http://www.allinterview.com/showanswers/3314.html TRANSACTION RECOVERY, READ CONSISTENCY http://www.allinterview.com/showanswers/3311.html SYSTEM - Data dictionary tables. DATA - Standard operational tables. DATA2- Static tables used for standard operations INDEXES - Indexes for Standard operational tables. INDEXES1 - Indexes of static tables used for standard operations. TOOLS - http://www.allinterview.com/showanswers/3275.html this writes all the commited data from the buffer cache to the data file. http://www.allinterview.com/showanswers/3277.html program global area is used to copy a block from the data file to the buffer cache. two processes are present in the pga:dedicated server process and the shared server process. http://www.allinterview.com/showanswers/3320.html Free extents cannot be merged together in Ver 6.0. Free extents are periodically coalesces with the neighboring free extent in Ver 7.0 http://www.allinterview.com/showanswers/3308.html system tablespace is a main part of oracle database.All the database information is in it.it is created when database is created. its managed by oracle server.dba cannot change its containts.