How will you create multiple rollback segments in a
database ?

1 Answer

Answer :

Create a database which implicitly creates a SYSTEM Rollback Segment
in a SYSTEM tablespace. Create a Second Rollback Segment name R0
in the SYSTEM tablespace. Make new rollback segment available (After
shutdown, modify init.ora file and Start database) Create other
tablespaces (RBS) for rollback segments. Deactivate Rollback Segment
R0 and activate the newly created rollback segments.

Related questions

Description : In SQL, the CREATE TABLESPACE isused A. to createa place in the databasefor storageof scheme objects, rollback segments, andnaming the data files to comprise the tablespace B. to createa database trigger C. to add/rename data files, to change storage D. All of theabove E. None of the above

Last Answer : to createa place in the databasefor storageof scheme objects, rollback segments, andnaming the data files to comprise the tablespace

Description : I've lost some Rollback Segments, how can I get my DB back? (for DBA

Last Answer : Re-start your database with the following INIT.ORA parameter if one of your rollback segments is corrupted. You can then drop the corrupted rollback segments and create it from scratch. ... Please contact Oracle Support before using it. _Corrupted_rollback_segments = (rbs01, rbs01, rbs03, rbs04)

Description : Is it possible to use Transaction control Statements such a ROLLBACK or COMMIT in Database Trigger ? Why ?

Last Answer : It is not possible. As triggers are defined for each table, if you use COMMIT of ROLLBACK in a trigger, it affects logical transaction processing.

Description : How will you force database to use particular rollback segment ?

Last Answer : SET TRANSACTION USE ROLLBACK SEGMENT rbs_name.

Description : What are the uses of rollback segment?

Last Answer : A database contains one or more rollback segments to temporarily store "undo" information.

Description : What are the uses of rollback segment?

Last Answer : A database contains one or more rollback segments to temporarily store "undo" information.

Description : What is rollback segment?

Last Answer : A database contains one or more rollback segments to temporarily store "undo" information.

Description : What is a Rollback segment entry ?

Last Answer : It is the set of before image data blocks that contain rows that are modified by a transaction. Each Rollback Segment entry must be completed within one rollback segment. A single rollback segment can have multiple rollback segment entries.

Description : How will you monitor rollback segment status ?

Last Answer : Querying the DBA_ROLLBACK_SEGS view IN USE - Rollback Segment is on-line. AVAILABLE - Rollback Segment available but not on-line. OFF-LINE - Rollback Segment off-line INVALID - Rollback ... corupted. PARTLY AVAILABLE - Contains data from an unresolved transaction involving a distributed database.

Description : What does ROLLBACK do ?

Last Answer : ROLLBACK retracts any of the changes resulting from the SQL statements in the transaction.

Description : What is Rollback Segment ?

Last Answer : A Database contains one or more Rollback Segments to temporarily store "undo" information.

Description : What are the various types of RollBack Segments ?

Last Answer : Public Available to all instances Private Available to specific instance

Description : How to implement the multiple control files for an existing database ?

Last Answer : Shutdown the database Copy one of the existing control file to new location Edit Config ora file by adding new control file. name Restart the database.

Description : How does one create a standby database? (for DBA)

Last Answer : While your production database is running, take an (image copy) backup and restore it on duplicate hardware. Note that an export will not work!!! On your standby database, issue ... the standby database, stop the recovery process and activate it: ALTER DATABASE ACTIVATE STANDBY DATABASE;

Description : Name a tablespace automatically created when you create a database.

Last Answer : The SYSTEM tablespace.

Description : How does one create and drop database users?

Last Answer : Look at these examples: CREATE USER scott IDENTIFIED BY tiger -- Assign password DEFAULT TABLESACE tools -- Assign space for table and index segments TEMPORARY TABLESPACE temp; -- Assign sort space ... give the user some space quota on its tablespaces: ALTER USER scott QUOTA UNLIMITED ON tools;

Description : How does one create a new database? (for DBA)

Last Answer : One can create and modify Oracle databases using the Oracle "dbca" (Database Configuration Assistant) utility. The dbca utility is located in the $ORACLE_HOME/bin directory. The Oracle Universal ... ='/u02/oradata/'; ALTER SYSTEM SET DB_CREATE_ONLINE_LOG_DEST_2='/u03/oradata/'; CREATE DATABASE;

Description : Which default Database roles are created when you create a Database?

Last Answer : CONNECT , RESOURCE and DBA are three default roles. The DBA_ROLES data dictionary view can be used to list all roles of a database and the authentication used for each role. The following query lists all the roles in ... ------------ -------- CONNECT NO RESOURCE NO DBA NO SECURITY_ADMIN YES

Description : What are the different types of segments?

Last Answer : Data segment, index segment, rollback segment and temporary segment.

Description : What are the different type of Segments ?

Last Answer : Data Segment, Index Segment, Rollback Segment and Temporary Segment.

Description : HOW MANY SEGMENTS ARE THERE IN THE KEY FLEXFIELD(S) IN ORACLE GENERAL LEDGER?

Last Answer : - Oracle GL Key flexfield can have 15 columns each representing a segment. However, the segments type can be:  Cost Center segment  Balancing segment  Account segment  Intercompany segment

Description : There is one application, which runs on a single terminal. There is another application that works on multiple terminals. What are the test techniques you will use on the second application that ... B. Concurrency test, Scalability C. Update & Rollback, Response time D. Concurrency test, Integrity

Last Answer : C. Update & Rollback, Response time

Description : An insert statement followed by a create table statement followed by rollback ? Will the rows be inserted ?

Last Answer : No.

Description : How does one manage Oracle database users? (for DBA

Last Answer : Oracle user accounts can be locked, unlocked, forced to choose new passwords, etc. For example, all accounts except SYS and SYSTEM will be locked after creating an Oracle9iDB database using the DB ... locked users account ALTER USER scott PASSWORD EXPIRE; -- Force user to choose a new password

Description : How does one manage Oracle database users? (for DBA

Last Answer : Oracle user accounts can be locked, unlocked, forced to choose new passwords, etc. For example, all accounts except SYS and SYSTEM will be locked after creating an Oracle9iDB database using the ... from SYS.V$BH log buffer spaces Increase LOG_BUFFER parameter or move log files to faster disks

Description : How does one backup a database using the export utility? (for DBA

Last Answer : Oracle exports are "logical" database backups (not physical) as they extract data and logical definitions from the database into a file. Other backup strategies normally back-up the physical data ... exports include more information about the database in the export file than user level exports.

Description : What strategies are available for backing-up an Oracle database? (for DBA

Last Answer : The following methods are valid for backing-up an Oracle database: Export/Import - Exports are "logical" database backups in that they extract logical definitions and data from the database to a file. ... , etc. If your database is in ARCGIVELOG mode, you also need to backup archived log files.

Description : Why and when should I backup my database? (for DBA

Last Answer : Backup and recovery is one of the most important aspects of a DBAs job. If you lose your company's data, you could very well lose your job. Hardware and software can always be ... things that will get you. Most failed recoveries are a result of organizational errors and miscommunications.

Description : What are the roles and user accounts created automatically with the database?

Last Answer : DBA - role Contains all database system privileges. SYS user account - The DBA role will be assigned to this account. All of the base tables and views for the database's dictionary ... administrative information and internal tables and views used by oracle tools are created using this username.

Description : What are the responsibilities of a Database Administrator ?

Last Answer : Installing and upgrading the Oracle Server and application tools. Allocating system storage and planning future storage requirements for the database system. Managing primary database structures ... tape Backing up and restoring the database. Contacting Oracle Corporation for technical support.

Description : Name two files used for network connection to a database.

Last Answer : TNSNAMES.ORA and SQLNET.ORA

Description : When creating a user, what permissions must you grant to allow them to connect to the database?

Last Answer : Grant the CONNECT to the user.

Description : How would you determine the time zone under which a database was operating?

Last Answer : select DBTIMEZONE from dual;

Description : Where would you look for errors from the database engine?

Last Answer : In the alert log.

Description : You have just had to restore from backup and do not have any control files. How would you go about bringing up this database?

Last Answer : I would create a text based backup control file, stipulating where on disk all the data files where and then issue the recover command with the using backup control file clause.

Description : What is network database link?

Last Answer : Network database link is created and managed by a network domain service. A network database link can be used when any user of any database in the network specifies a global object name in a SQL statement or object definition.

Description : What is public database link?

Last Answer : Public database link is created for the special user group PUBLIC. A public database link can be used when any user in the associated database specifies a global object name in a SQL statement or object definition.

Description : What is private database link?

Last Answer : 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.

Description : What are the types of database links?

Last Answer : Private database link, public database link & network database link.

Description : What is Database Link ?

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

Description : What are the steps involved in Database Shutdown ?

Last Answer : Close the Database, Dismount the Database and Shutdown the Instance.

Description : What are the advantages of operating a database in ARCHIVELOG mode over operating it in NO ARCHIVELOG mode ?

Last Answer : Complete database recovery from disk failure is possible only in ARCHIVELOG mode. Online database backup is possible only in ARCHIVELOG mode.

Description : What are the different modes of mounting a Database with the Parallel Server ?

Last Answer : Exclusive Mode If the first instance that mounts a database does so in exclusive mode, only that Instance can mount the database. Parallel Mode If the first instance that mounts a database is started in parallel mode, other instances that are started in parallel mode can also mount the database.

Description : Can Full Backup be performed when the database is open ?

Last Answer : No.

Description : What are the steps involved in Database Startup ?

Last Answer : Start an instance, Mount the Database and Open the Database. Rolling forward to recover data that has not been recorded in data files, yet has been recorded in the on-line redo ... Resolving any pending distributed transactions undergoing a two- phase commit at the time of the instance failure.

Description : Can you store pictures in database? How?

Last Answer : Yes , in long Raw datatype.

Description : Can U disable database trigger? How?

Last Answer : Yes. With respect to table ALTER TABLE TABLE [[ DISABLE all_trigger ]]

Description : Who created all these users in my database?/ Can I drop this user? (for DBA

Last Answer : Oracle creates a number of default database users or schemas when a new database is created. Below are a few of them: SYS/CHANGE_ON_INSTALL or INTERNAL Oracle Data Dictionary/ Catalog Created ... there should be no problem altering these users to use a different default and temporary tablespace.

Description : What are Database Triggers and Stored Procedures

Last Answer : Database Triggers :: Database Triggers are Procedures that are automatically executed as a result of insert in, update to, or delete from table. Database triggers have the values old and new to ... procedures is that many users can use the same procedure in compiled and ready to use format.

Description : What is a database link ?

Last Answer : Database Link is a named path through which a remote database can be accessed.