Can one rename a tablespace? (for DBA)

Can one rename a tablespace? (for DBA)
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1 Answer

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
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Related questions

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;

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.

Can one rename a database user (schema)? (for DBA)

Description : Can one rename a database user (schema)? (for DBA)

Last Answer : No, this is listed as Enhancement Request 158508. Workaround: Do a user-level export of user A create new user B Import system/manager fromuser=A touser=B Drop user A

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 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

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.

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.

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.

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

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

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.

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.

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

What is difference between Rename and Alias?

Description : What is difference between Rename and Alias?

Last Answer : Rename is a permanent name given to a table or column whereas Alias is a temporary name given to a table or column which do not exist once the SQL statement is executed.

Can one export a subset of a table? (for DBA

Description : Can one export a subset of a table? (for DBA

Last Answer : From Oracle8i one can use the QUERY= export parameter to selectively unload a subset of the data from a table. Look at this example: exp scott/tiger tables=emp query=\"where deptno=10\"

How does one use the import/export utilities? (for DBA

Description : How does one use the import/export utilities? (for DBA

Last Answer : Look for the "imp" and "exp" executables in your $ORACLE_HOME/bin directory. One can run them interactively, using command line parameters, or using parameter files. Look at the imp/exp parameters ... and export data with the "Schema Manager" GUI that ships with Oracle Enterprise Manager (OEM).

What is import/export and why does one need it? (for DBA

Description : What is import/export and why does one need it? (for DBA

Last Answer : The Oracle export (EXP) and import (IMP) utilities are used to perform logical database backup and recovery. They are also used to move Oracle data from one machine, database or schema to ... corruption. Ensure that all the data can be read. . Transporting tablespaces between databases . Etc.

Are there any troubleshooting tips for OEM? (for DBA

Description : Are there any troubleshooting tips for OEM? (for DBA

Last Answer : . Create the OEM repository with a user (which will manage the OEM) and store it in a tablespace that does not share any data with other database users. It is a bad practice to create ... successfully. Check the log to see the results of the execution rather than relying on this status.

Where can one get more information about TCL? (for DBA

Description : Where can one get more information about TCL? (for DBA

Last Answer : One can write custom event checking routines for OEM using the TCL (Tool Command Language) language. Check the following sites for more information about TCL: . The Tcl Developer Xchange - ... the OraTCL package . Tom Poindexter's Tcl Page - Oratcl was originally written by Tom Poindexter

How does one start the Oracle Intelligent Agent? (for DBA

Description : How does one start the Oracle Intelligent Agent? (for DBA

Last Answer : One needs to start an OIA (Oracle Intelligent Agent) process on all machines that will to be managed via OEM. For OEM 9i and above:

What is the Oracle Intelligent Agent? (for DBA

Description : What is the Oracle Intelligent Agent? (for DBA

Last Answer : The Oracle Intelligent Agent (OIA) is an autonomous process that needs to run on a remote node in the network to make the node OEM manageable. The Oracle Intelligent Agent is ... events registered in Enterprise Manager; and . Executing tasks associated with jobs submitted to Enterprise Manager.

How does one backout events and jobs during maintenance slots? (for DBA

Description : How does one backout events and jobs during maintenance slots? (for DBA

Last Answer : Managemnet and data collection activity can be suspended by imposing a blackout. Look at these examples: agentctl start blackout # Blackout the entrire agent agentctl stop blackout # Resume normal monitoring ... management agentctl start blackout -s jobs -d 00:20 # Blackout jobs for 20 minutes

What kind of jobs can one schedule with OEM? (for DBA

Description : What kind of jobs can one schedule with OEM? (for DBA

Last Answer : OEM comes with pre-defined jobs like Export, Import, run OS commands, run sql scripts, SQL*Plus commands etc. It also gives you the flexibility of scheduling custom jobs written with the TCL language.

Should the OEM Console be displayed at all times (when there are scheduled jobs)? (for DBA

Description : Should the OEM Console be displayed at all times (when there are scheduled jobs)? (for DBA

Last Answer : When a job is submitted the agent will confirm the status of the job. When the status shows up as scheduled, you can close down the OEM console. The processing of the job is managed by the OIA ... that OEM will not be able to send e-mail and paging notifications when the Console is not started.

WHY USE RMAN ? (for DBA

Description : WHY USE RMAN ? (for DBA

Last Answer : No extra costs Its available free ?RMAN introduced in Oracle 8 it has become simpler with newer versions and easier than user managed backups ?Proper security ?You are 100% sure your ... what need to backed up Knows what is required for recovery Knows what backups are redundant

WHAT IS RMAN ? (for DBA

Description : WHAT IS RMAN ? (for DBA

Last Answer : Recovery Manager is a tool that: manages the process of creating backups and also manages the process of restoring and recovering from them.

Are there any undocumented commands in Oracle? (for DBA

Description : Are there any undocumented commands in Oracle? (for DBA

Last Answer : Sure there are, but it is hard to find them. Look at these examples: From Server Manager (Oracle7.3 and above): ORADEBUG HELP It looks like one can change memory locations with the ORADEBUG POKE ... rdbms/lib/oradbx.o; make -f oracle.mk oradbx) SQL*Plus: ALTER SESSION SET CURRENT_SCHEMA = SYS;

How does one use ORADEBUG from Server Manager/ SQL*Plus? (for DBA

Description : How does one use ORADEBUG from Server Manager/ SQL*Plus? (for DBA

Last Answer : Execute the "ORADEBUG HELP" command from svrmgrl or sqlplus to obtain a list of valid ORADEBUG commands. Look at these examples: SQLPLUS> REM Trace SQL statements with bind variables SQLPLUS> oradebug ... oradebug lkdebug -a convres SQLPLUS> oradebug lkdebug -r (i.e 0x8066d338 from convres dump)

What is the difference between DBFile Sequential and Scattered Reads?(for DBA

Description : What is the difference between DBFile Sequential and Scattered Reads?(for DBA

Last Answer : Both "db file sequential read" and "db file scattered read" events signify time waited for I/O read requests to complete. Time is reported in 100's of a second for Oracle 8i releases and below, ... v_$system_event b where a.event = 'db file sequential read' and b.event = 'db file scattered read';

How does one tune Oracle Wait events? (for DBA

Description : How does one tune Oracle Wait events? (for DBA

Last Answer : Some wait events from V$SESSION_WAIT and V$SYSTEM_EVENT views: Event Name: Tuning Recommendation: db file sequential read Tune SQL to do less I/O. Make sure all objects are analyzed. Redistribute ... SYS.V$BH log buffer spaces Increase LOG_BUFFER parameter or move log files to faster disks

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

What are the common RMAN errors (with solutions)? (for DBA

Description : What are the common RMAN errors (with solutions)? (for DBA

Last Answer : Some of the common RMAN errors are: RMAN-20242: Specification does not match any archivelog in the recovery catalog. Add to RMAN script: sql 'alter system archive log current'; RMAN-06089: archived log xyz not found or out of sync with catalog Execute from RMAN: change archivelog all validate;

What is STATSPACK and how does one use it? (for DBA

Description : What is STATSPACK and how does one use it? (for DBA

Last Answer : Statspack is a set of performance monitoring and reporting utilities provided by Oracle from Oracle8i and above. Statspack provides improved BSTAT/ESTAT functionality, though the old BSTAT/ESTAT scripts ... values recorded in two snapshots . sptrunc.sql - Truncates all data in Statspack tables

What tools/utilities does Oracle provide to assist with performance tuning? (for DBA

Description : What tools/utilities does Oracle provide to assist with performance tuning? (for DBA

Last Answer : Oracle provide the following tools/ utilities to assist with performance monitoring and tuning: . TKProf . UTLBSTAT.SQL and UTLESTAT.SQL - Begin and end stats monitoring . Statspack . Oracle Enterprise Manager - Tuning Pack

What tuning indicators can one use? (for DBA

Description : What tuning indicators can one use? (for DBA

Last Answer : The following high-level tuning indicators can be used to establish if a database is performing optimally or not: . Buffer Cache Hit Ratio Formula: Hit Ratio = (Logical Reads - Physical ... increase hit ratio . Library Cache Hit Ratio Action: Increase the SHARED_POOL_SIZE to increase hit ratio

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 is the difference between restoring and recovering? (for DBA

Description : What is the difference between restoring and recovering? (for DBA

Last Answer : Restoring involves copying backup files from secondary storage (backup media) to disk. This can be done to replace damaged files or to copy/move a database to a new location. Recovery is the process ... as SYSDBA Sql> RECOVER DATABASE UNTIL TIME '2001-03-06:16:00:00' USING BACKUP CONTROLFILE;

What is the difference between online and offline backups? (for DBA

Description : What is the difference between online and offline backups? (for DBA

Last Answer : A hot backup is a backup performed while the database is online and available for read/write. Except for Oracle exports, one can only do on- line backups when running in ARCHIVELOG mode. A cold backup is a backup performed while the database is off-line and unavailable to its users.

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.