Explain the relationship among Database, Tablespace and Data file.?

Explain the relationship among Database, Tablespace and
Data file.?
by

1 Answer

Answer :

Each databases logically divided into one or more tablespaces one or
more data files are explicitly created for each tablespace
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Related questions

Explain the relationship among database, tablespace and data file.

Description : Explain the relationship among database, tablespace and data file.

Last Answer : Each databases logically divided into one or more tablespaces one or more data files are explicitly created for each tablespace.

Explain the relationship among Database, Tablespace and Data file.?

Description : Explain the relationship among Database, Tablespace and Data file.?

Last Answer : Each databases logically divided into one or more tablespaces one or more data files are explicitly created for each tablespace

How do you add a data file to a tablespace

Description : How do you add a data file to a tablespace

Last Answer : ALTER TABLESPACE ADD DATAFILE SIZE

Name a tablespace automatically created when you create a database.

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

Last Answer : The SYSTEM tablespace.

How can you increase the capacity of an Oracle tablespace? Note: there are 2 correct answers in this question A. Resize the existing data file B. Add a new data file to the existing tablespace C. Enable compression of backup data using Oracle advanced compression D. Increase the value of the database parameter DB_BLOCK_SIZE

Description : How can you increase the capacity of an Oracle tablespace? Note: there are 2 correct answers in this question A. Resize the existing data file B. Add a new data file to ... compression of backup data using Oracle advanced compression D. Increase the value of the database parameter DB_BLOCK_SIZE

Last Answer : B. Add a new data file to the existing tablespace

Can one rename a tablespace? (for DBA)

Description : Can one rename a tablespace? (for DBA)

Last Answer : No, this is listed as Enhancement Request 148742. Workaround: Export all of the objects from the tablespace Drop the tablespace including contents Recreate the tablespace Import the objects

What view would you use to determine free space in a tablespace?

Description : What view would you use to determine free space in a tablespae?

Last Answer : DBA_FREE_SPACE

What is the difference between a TEMPORARY tablespace and a PERMANENT tablespace?

Description : What is the difference between a TEMPORARY tablespace and a PERMANENT tablespace?

Last Answer : A temporary tablespace is used for temporary objects such as sort structures while permanent tablespaces are used to store those objects meant to be used as the true objects of the database.

What does coalescing a tablespace do?

Description : What does coalescing a tablespace do?

Last Answer : Coalescing is only valid for dictionary-managed tablespaces and de- fragments space by combining neighboring free extents into large single extents.

Which parameter specified in the DEFAULT STORAGE clause of CREATE TABLESPACE cannot be altered after creating the tablespace?

Description : Which parameter specified in the DEFAULT STORAGE clause of CREATE TABLESPACE cannot be altered after creating the tablespace?

Last Answer : All the default storage parameters defined for the tablespace can be changed using the ALTER TABLESPACE command. When objects are created their INITIAL and MINEXTENS values cannot be changed.

How do I find used/free space in a TEMPORARY tablespace? (for DBA

Description : How do I find used/free space in a TEMPORARY tablespace? (for DBA

Last Answer : Unlike normal tablespaces, true temporary tablespace information is not listed in DBA_FREE_SPACE. Instead use the V$TEMP_SPACE_HEADER view: SELECT tablespace_name, SUM (bytes used), SUM (bytes free) FROM V$temp_space_header GROUP BY tablespace_name;

What is Tablespace Quota ?

Description : What is Tablespace Quota ?

Last Answer : The collective amount of disk space available to the objects in a schema on a particular tablespace.

What is default tablespace ?

Description : What is default tablespace ?

Last Answer : The Tablespace to contain schema objects created without specifying a tablespace name.

How does one prevent tablespace fragmentation? (for DBA)

Description : How does one prevent tablespace fragmentation? (for DBA)

Last Answer : Always set PCTINCREASE to 0 or 100. Bizarre values for PCTINCREASE will contribute to fragmentation. For example if you set PCTINCREASE to 1 you will see that your extents are going to have weird and ... /O may be required to fetch the additional blocks where extent maps of the segment are stored.

What is a Tablespace?

Description : What is a Tablespace?

Last Answer : A database is divided into Logical Storage Unit called tablespaces. A tablespace is used to grouped related logical structures together

Can a Tablespace hold objects from different Schemes ?

Description : Can a Tablespace hold objects from different Schemes ?

Last Answer : Yes.

Can a tablespace hold objects from different schemes?

Description : Can a tablespace hold objects from different schemes?

Last Answer : Yes.

What is SYSTEM tablespace and when is it created?

Description : What is SYSTEM tablespace and when is it created?

Last Answer : Every Oracle database contains a tablespace named SYSTEM, which is automatically created when the database is created. The SYSTEM tablespace always contains the data dictionary tables for the entire database.

What is a tablespace?

Description : What is a tablespace?

Last Answer : A database is divided into Logical Storage Unit called tablespaces. A tablespace is used to grouped related logical structures together.

How do you move tables from one tablespace to another tablespace?

Description : How do you move tables from one tablespace to another tablespace?

Last Answer : There are several methods to do this; 1) export the table, drop the table, create the table definition in the new tablespace, and then import the data (imp ignore=y). 2) Create ... table and rename the temporary table as the original: DROP TABLE real_table; RENAME temp_name TO real_table;

What is a Locally Managed Tablespace?

Description : What is a Locally Managed Tablespace?

Last Answer : Locally Managed Tablespace is a tablespace that record extent allocation in the tablespace header. Each tablespace manages its own free and used space within a bitmap structure stored in one of the ... tracks adjacent free space) ▪ Changes to the extent bitmaps do not generate rollback information

What is a Tablespace?

Description : What is a Tablespace?

Last Answer : A tablespace is a logical storage unit within an Oracle database. Tablespace is not visible in the file system of the machine on which the database resides. A tablespace, in turn, ... three types of tablespaces in Oracle: ▪ Permanent tablespaces ▪ Undo tablespaces ▪ Temporary tablespaces

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

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

What do you mean by flat file database?

Description : What do you mean by flat file database?

Last Answer : It is a database in which there are no programs or user access languages. It has no cross-file capabilities but is user-friendly and provides user-interface management.

What is a Database instance ? Explain

Description : What is a Database instance ? Explain

Last Answer : A database instance (Server) is a set of memory structure and background processes that access a set of database files. The process can be shared by all users. The memory structure that are ... helps up to improve database performance by decreasing the amount of I/O performed against data file.

What view would you use to look at the size of a data file?

Description : What view would you use to look at the size of a data file?

Last Answer : DBA_DATA_FILES

How do you resize a data file?

Description : How do you resize a data file?

Last Answer : ALTER DATABASE DATAFILE RESIZE ;

Table Space,Data Files,Parameter File, Control Files

Description : Table Space,Data Files,Parameter File, Control Files

Last Answer : Table Space :: The table space is useful for storing the data in the database.When a database is created two table spaces are created. a) System Table space :: This data file stores all the tables ... They contain the Db name, name and location of dbs, data files ,redo log files and time stamp.

It is possible to use raw devices as data files and what is the advantages over file. system files ?

Description : It is possible to use raw devices as data files and what is the advantages over file. system files ?

Last Answer : Yes. The advantages over file system files. I/O will be improved because Oracle is bye-passing the kernnel which writing into disk. Disk Corruption will be very less.

How does one manage Oracle database users? (for DBA

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

How does one manage Oracle database users? (for DBA

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

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

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.

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

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.

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

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.

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

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.

What are the responsibilities of a Database Administrator ?

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.

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

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;

Name two files used for network connection to a database.

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

Last Answer : TNSNAMES.ORA and SQLNET.ORA

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

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.

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

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

Last Answer : select DBTIMEZONE from dual;

Where would you look for errors from the database engine?

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

Last Answer : In the alert log.

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

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.

What is network database link?

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.

What is public database link?

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.

What is private database link?

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.

What are the types of database links?

Description : What are the types of database links?

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

What is 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.

What are the steps involved in Database Shutdown ?

Description : What are the steps involved in Database Shutdown ?

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

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

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.

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

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.