A table is the basic unit of data storage in an ORACLE database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.

pravesh28

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• Mar 27th, 2010

Table is manager which contain row and colomnin which store data ande retrive data

thumatinagaraju

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• Oct 24th, 2006

Table is data base object which stores the data in the logical representatiom in form of rows n coluns which is existing in two dimension form... and is stored in the databse.

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A view is a virtual table. Every view has a Query attached to it. (The Query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)

pravesh28

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• Mar 27th, 2010

View means virtualit is virtual table drived from base tableview doesnt contain any data view is mirrar image of data that we  can set the its size

C.Ramesh

• Oct 17th, 2007

View is a Virtual Table. It likes like a table. View provide additional level tabel security and providing selected columns only and it accessing different tables no need to joins of different tables. Views also stores data like (Materialized Views) it can be referesh methods like fast, complete.

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Synonyms are used to : Mask the real name and owner of an object.Provide public access to an objectProvide location transparency for tables, views or program units of a remote database.Simplify the SQL statements for database users.

harrykhokhar

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• Jun 1st, 2010

Synonyms are alternative names for the objects like views, indexes, etc.

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Yes.

matabrez

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• Jan 10th, 2011

Yes one tablespace can hold objects from different schemas.Eg. when we create any schema (user) than we can assign default tablespace like this for any user user we can use same tablespace. Eg. SYSTE...

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ORACLE database's data is stored in data blocks. One data block corresponds to a specific number of bytes of physical database space on disk.

matabrez

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• Jan 10th, 2011

Smallest logical of Oracle database. In Oracle 10g default data block size is 8192 byres means 8k.
Other data block size are 2k, 4k, 8k, 16k, 32kWe have only these available data blocks in oracle database.

C.Ramesh

• Oct 27th, 2007

Oracle Data Blocks is logical storage unit of Oracle and One Oracle Data Blocks containts multiple of Operating system Blocks. Data blocks contains contigous of Bytes.

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Hi,

If a user executes a query which is already being used by a view exactly will oracle use already existing view to retrieve data or use the query executed by user?

Regards,
Shashi

Aayudh

• Aug 24th, 2011

Oracle uses query executed by user because when you use a view name in an other query, it simply transform query. select empid,name from emp; --- original create view emp_view as select empid,name f...

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Private database link is created on behalf of a specific user. A private database link can be used only when the owner of the link specifies a global object name in a SQL statement or in the definition of the owner's views or procedures.

Ravikumar

• Oct 18th, 2011

Database link is created by a user in his schema,it has 2 types

1.private database link
2.public database link /global

private database link is access the object in separate user

syntax:

create database link connect to username identified by password using 'db_name';

kailasTile

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• Oct 14th, 2011

Private database link is created by a user in his schema. While creating the link, the keyword GLOBAL is not used. The syntax for creation is CREATE DATABASE LINK myPrivateDBLink connect to identified by using ;
Private DB links can not be used by other schema's.

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The Information in a redo log file is used only to recover the database from a system or media failure prevents database data from being written to a database's data files.

Dinesh Chandra

• Aug 27th, 2012

Redo log records the changes made in database. Redo logs is mainly used to recover data.

rohitmisri

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• Jun 17th, 2010

Hi,Redo log information is the one of the major pard of the database , at any time if the oracle server instance get aborted and then it need recovery, so at that time redo log plays a role to recover...

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A schema is collection of database objects of a User.

ARUN BHUKKER

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• Oct 19th, 2012

A schema is the set of objects (tables, views, indexes, etc) that belongs to an user account. It is often used as another way to refer to an Oracle account. Most Oracle database installations traditio...

Mohammad Mujeeb

• Oct 25th, 2011

Schema is a collect of object (table,view,cluster etc) that belongs to an user account.

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Where does the process dumps information about the error?

ARUN BHUKKER

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• Oct 19th, 2012

Errors are stored in alert.log file it can be shecked using the parameter background_dump_dest

Use show parameter background_dump_dest
for path of the alert.log in trace directory

matabrez

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• Jan 10th, 2011

Alerts will log to alert.log  and alert trace files will be saved in  $ORACLE_HOME/admin/bdump directory.

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What is the use of archive log file? How will you apply archive log file? How does archive log file helps to make backup consistent?

ARUN BHUKKER

 Profile Answers by ARUN BHUKKER Questions by ARUN BHUKKER

• Oct 19th, 2012

A Archive log file is used to archive the filled redo log files. and used in recovery.

It is used in recovery but not in instance recovery.
Rest it is used to make database consistent after recovery by matching header of data file and control file checkpoint information.

rsona

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• Mar 2nd, 2011

Hello Ganesh,Q : What is the use of archive log file? A : It is used for Point In Time Database Instance Recovery.     Q : How will you apply archive log file? A : Archive Log need...

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sandeep

• Apr 26th, 2013

Ps -ef | grep oracle

chittu.kotian

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• May 16th, 2012

On Unix the command is ps -aef | grep -i pmon

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How we can determine the physical architecture of oracle?

ranjithsv

• Oct 2nd, 2013

Datafiles(*.dbf),
Controlfiles(*.ctl),
Redologfiles(*.log),
Archivelogfiles(*.arc)

ARUN BHUKKER

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• Oct 19th, 2012

Oracle architecture consist of four structures: 1. Memory structure (SGA, PGA) 2. Process structure (user process, server process, background process) 3. Physical structure (data files, redo log files...

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How does the SMON process performs recovery after instance failure?

ranjithsv18

• Oct 2nd, 2013

When hardware failure, software failue and shutdown abnormally happen... SMON taking care of Instance failure, coalesce failure space and deallocating temp segment start to recover instance Roll fw...

Nagaraj OCP

• Dec 27th, 2011

When shutdown abort happens, oracle server gets crashed. To recover from the crash, SMON will check the online Redo data files and last SCN no in the Redo log files and SCN number in the undo tablespa...

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ranjithsv

• Oct 2nd, 2013

Its relation between SGA and 5 Mandatory Background process
SMON,PMON,DBWR,LGWR,CKPT

ARUN BHUKKER

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• Oct 19th, 2012

A background process maintain relationship between memory structure and physical structure of Oracle server. Started when Oracle instance is started. Consist of 5 mandatory and some optional backgro...

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A data file can be associated with only one database. Once created a data file can't change size.One or more data files form a logical unit of database storage called a tablespace.

ranjithsv18

• Oct 2nd, 2013

Block size available from 2k,4k,8k,16k and 32k.

As per oracle point of view Default (or) standard block size is 8k for Data files.The initialization parameter

db_block_size=8k (8192)remaining size are non-standard blok size. Extents size 64k.

(Datafile

NAGARAJ OCP

• Dec 27th, 2011

In data files, we cant change the extent management, type of it. But we can change the storage space for it if we need after the database (tablespace) creation.

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Harshad Khuspe

• Feb 26th, 2015

Virtual Tables are contains information about the base tables in oracle. Like V$database is virtual table which provide information of database name, open mode etc. or v$log will provide redo log members etc.

ARUN BHUKKER

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• Oct 19th, 2012

Either virtual table is a temporary table or v$ or Xv$ views

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A database link is a named object that describes a "path" from one database to another.

Vinod Karuturi

• Nov 16th, 2015

A database link is a schema object in one database that enables you to access objects on another database. The other database need not be an Oracle Database system. However, to access non-Oracle systems you must use Oracle Heterogeneous Services.

Madhu Alampalli

• Sep 24th, 2015

Cluster key is a related column of tables in the cluster. For example, in Table EMP which has (EMP NO, EMP NAME, DEP NO, etc ) and DEPT which has (DEPT NAME, DEPT NO etc), DEPT NO is the cluster key in this cluster.

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Yes.

mayur

• Dec 24th, 2015

No, at a time only one tablespace as default can be allocate to any user. If we want to store objects of one user to multiple tablespace then assign that tablespaces as a default tablespace for user at a time

matabrez

 Profile Answers by matabrez Questions by matabrez

• Jan 10th, 2011

Yes objects of the same schema can reside in different tablepaces. Becuase when we create any schema (user) we can assign many tablespaces to one shcema so objects (eg. tables) will create in different tablespaces.

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What are the advantages & disadvantages of both two.

Harshad Khuspe

• Dec 27th, 2015

In case of RAC (Real Application Cluster) use of GNS will be helpful if we have more than 10 node cluster. GNS need not to be assign IP addresses and it select automatically with the help of DHCP

frankie Lester

• Aug 11th, 2015

GNS uses DNS and DHCP to assign IP address on the network.

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