balakrishna
Answered On : Oct 8th, 2005
the phycial structures of the database are 1.datafile2.redologfile3.control filedatafile:- datafile contains actial data of the database.redologfile:- it contains all changes done to the data base.it works in the circular fashion.controlfile:- it contains status and structure of the database.
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Oracle database physical structure contains
- Data files -- always occupy the declared size on the hard disk irrespective of the rows contained in them (.dbf). The data files contain
- Data blocks -- smallest unit of I/O. each block contains a header
- ROWID -- two byte pseudo column to identify phsical location of a row
- Table clusters -- tables which are often used together in queries are physically grouped in same data block. Cluster tables are joined on 'cluster key' which identifies the common column between the two tables.
- Online redo log files (.rdo and .arc)
- Control files -- contain one slot per data file declared for a database. Also contain other configuration parameters. (.ctl)
- Password files.
- sidALTR.log files -- log critical failures
- Trace files -- saves user session traces (.trc)
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puneet
Answered On : Feb 16th, 2006
mainly consist of 3 files1) control file2)redolog file3)data filecontrol file-contain current status of the datafiles , redolog file. contain location of datafile and control file.redolog file- records all the changes made to the database.log writer writes the redo enries from the redolog buffer to the redolog file.datafile-
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manu
Answered On : Apr 2nd, 2006
Physical database components are : Database files , control files & Redo log files.
Database files : Contains actual data & which is very largre files.
Control files : contains inforrmation regarding database files & it records the changes makes to database files.
Redolog files : When every changes makes to databases , it records into Redolog files .
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manish hoiyani
Answered On : Sep 14th, 2006
physical structures consist of three core database files
1> datafile... used to store the actual data in the database.
2> redologfile.. stores all changes which are to made in the database. oracle
keeps two redolog files in the db. in separate disk,, so that during disk failure
we can recover the database.
3> controlfile.. which stores the physical location of the datafile, stores the scn for each and every update in datafile and redolog file.. we can also recover the database from control file also....
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Mohammed Abdul Afroze
Answered On : Sep 18th, 2007
The components of a Physical Structure of a Database are as Follows:
1.Control Files
2.Redolog Files
3.Data Files.
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