Create tablespace logging datafile,wwe lunch box toys r us,how to build an entry door awning designs - Tips For You

Fichiers de donnees Fichiers de controles Fichiers de journalisations Fichiers de parametres d’initialisation.
Fichiers de donnees Occupent la majeure partie de la base de donnees Les fichiers de donnees contiennent des informations de deux types : - Le dictionnaire de donnees et de travail - Les donnees des utilisateurs La lecture de ces fichiers de donnees est faite a l'aide des processus utilisateurs tandis que l'ecriture est assure par le processus DBWR (Database Writer) Organises selon une structure de stockage logique appele tablespace.
Tablespace Une base peut etre decomposee en tablespaces : partitions logiques contenant un ou plusieurs fichiers. Les differents types de tablespaces speciaux Tablespaces en lecture seule (READ ONLY tablespaces) Ces tablespaces sont utilises en lecture seule.
Les differents types de tablespaces speciaux Tablespaces temporaires (temporary tablespaces) On peut creer un tablespace temporarire par defaut autre que TEMP, ou seront stockees toutes les donnees temporaires (utilisees lors des tris, creation d'index, jointures, etc).
Les differents types de tablespaces speciaux Tablespace d'annulation (undo tablespaces) Les UNDO tablespaces sont exclusivement reserves au stockage de segments d'images avant modification des donnees pour des annulations eventuelles (ROLLBACK).
Les fichiers de controle contiennent les informations relatives a la structure physique de la base de donnees – Les adresses physiques d’acces aux ressources (fichiers de donnees et journaux) – Les dates de creation Contiennent des informations sur l’etat de la base Ils sont multiplexes afin de proteger la base contre toute defaillance due a la perte de ces fichiers. Administration d’Oracle 10g Mohamed Anis BACH TOBJI Assistant a l’ESCE – Universite de Manouba. Chapitre 3 : Mise a jour des fichiers de controle et des fichiers redo log Administration des bases de donnees. Objectifs A la fin de ce chapitre, vous pourrez : presenter l'utilisation d'operations de chargement de donnees par chemin direct decrire l'utilisation. 1 Cours oracle n°1 Le SGBD ORACLE Patrice Saintenoy Universite Paris X - Nanterre UFR SEGMI Licence MIAGE.
ARCHITECTURE DE SYSTEMES RELATIONNELS 1.L E SGBD ORACLE ORACLE a ete edite par la societe Oracle Corporation, implantee aux USA a RedWood Shores en Californie. Creative Commons License? ???? ?????? ??? ??? ?????-???-???????? 2.0 ???? ????? ?? ???? ? ????. This statement prepares a database for initial use and erases any data currently in the specified files.
In this release of Oracle Database and in subsequent releases, several enhancements are being made to ensure the security of default database user accounts. Use the CREATE DATABASE statement to create a database, making it available for general use.
This statement erases all data in any specified datafiles that already exist in order to prepare them for initial database use. After creating the database, this statement mounts it in either exclusive or parallel mode, depending on the value of the CLUSTER_DATABASE initialization parameter and opens it, making it available for normal use. You cannot use special characters from European or Asian character sets in a database name. If you omit the database name from a CREATE DATABASE statement, then Oracle Database uses the name specified by the initialization parameter DB_NAME. If you do not specify these clauses, then Oracle Database creates default passwords change_on_install for user SYS and manager for user SYSTEM.
Specify CONTROLFILE REUSE to reuse existing control files identified by the initialization parameter CONTROL_FILES, overwriting any information they currently contain. You cannot use this clause if you also specify a parameter value that requires that the control file be larger than the existing files. If you omit this clause and any of the files specified by CONTROL_FILES already exist, then the database returns an error. Specify the initial sizing of the datafiles section of the control file at CREATE DATABASE or CREATE CONTROLFILE time.
The number of datafiles accessible to your instance is also limited by the initialization parameter DB_FILES.
Specify the maximum number of instances that can simultaneously have this database mounted and open. Restriction on CHARACTER SET You cannot specify the AL16UTF16 character set as the database character set. Specify the national character set used to store data in columns specifically defined as NCHAR, NCLOB, or NVARCHAR2. Use the database_logging_clauses to determine how Oracle Database will handle redo log files for this database.
The redo_log_file_spec clause specifies a redo log file group containing one or more redo log file members (copies). In all these cases, the parameter settings must correctly specify operating system filenames or creation form Automatic Storage Management filenames, as appropriate.
If no values are set for any of these parameters, then the database creates a log file in the default location for the operating system on which the database is running. Specify the maximum number of redo log file groups that can ever be created for the database. This parameter is useful only if you are using Oracle Database in archivelog mode with Real Application Clusters. Specify ARCHIVELOG if you want the contents of a redo log file group to be archived before the group can be reused.
Specify NOARCHIVELOG if the contents of a redo log file group need not be archived before the group can be reused. Use the tablespace clauses to configure the SYSTEM and SYSAUX tablespaces and to specify a default temporary tablespace and an undo tablespace.
When you create a locally managed SYSTEM tablespace, you cannot change it to be dictionary managed, nor can you create any other dictionary-managed tablespaces in this database. If you specify this clause, the database must have a default temporary tablespace, because a locally managed SYSTEM tablespace cannot store temporary segments.
If you specify EXTENT MANAGEMENT LOCAL but you do not specify the DATAFILE clause, you can omit the default_temp_tablespace clause.
If you specify both EXTENT MANAGEMENT LOCAL and the DATAFILE clause, then you must also specify the default_temp_tablespace clause and explicitly specify a datafile for that tablespace.
If you specify EXTENT MANAGEMENT LOCAL but you do not specify the DATAFILE clause, you can omit the undo_tablespace clause. If you specify both EXTENT MANAGEMENT LOCAL and the DATAFILE clause, then you must also specify the undo_tablespace clause and explicitly specify a datafile for that tablespace.
Use this clause to determine the default type of subsequently created tablespaces and of the SYSTEM and SYSAUX tablespaces. A bigfile tablespace contains only one datafile or tempfile, which can contain up to approximately 4 billion (232) blocks.
A smallfile tablespace is a traditional Oracle tablespace, which can contain 1022 datafiles or tempfiles, each of which can contain up to approximately 4 million (222) blocks. You must specify this clause if you have specified one or more datafiles for the SYSTEM tablespace using the DATAFILE clause. If you have enabled Oracle-managed files and you omit the SYSAUX clause, then the database creates the SYSAUX tablespace as an online, permanent, locally managed tablespace with one datafile of 100 MB, with logging enabled and automatic segment-space management. The syntax for specifying datafiles for the SYSAUX tablespace is the same as that for specifying datafiles during tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Automatic Storage Management or in a file system or raw device. The DATAFILE clause and extent_management_clause have the same semantics they have in a CREATE TABLESPACE statement.
Specify BIGFILE or SMALLFILE to determine whether the default temporary tablespace is a bigfile or smallfile tablespace. The syntax for specifying tempfiles for the default temporary tablespace is the same as that for specifying tempfiles during temporary tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Automatic Storage Management or in a file system or raw device. On some operating systems, Oracle does not allocate space for a tempfile until the tempfile blocks are actually accessed. The extent_management_clause clause has the same semantics in CREATE DATABASE and CREATE TABLESPACE statements. If you have opened the instance in automatic undo mode (that is, the UNDO_MANAGEMENT initialization parameter is set to AUTO), then you can specify the undo_tablespace to create a tablespace to be used for undo data. The syntax for specifying datafiles for the undo tablespace is the same as that for specifying datafiles during tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Automatic Storage Management or in a file system or raw device.
If you specify this clause, then Oracle Database creates an undo tablespace named tablespace, creates the specified datafile(s) as part of the undo tablespace, and assigns this tablespace as the undo tablespace of the instance. If you have specified a value for the UNDO_TABLESPACE initialization parameter in your initialization parameter file before mounting the database, then you must specify the same name in this clause. If you omit this clause, then Oracle Database creates a default database with a default smallfile undo tablespace named SYS_UNDOTBS and assigns this default tablespace as the undo tablespace of the instance.
The syntax for specifying datafiles for the SYSTEM tablespace is the same as that for specifying datafiles during tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Automatic Storage Management or in a file system or raw device. If you are running the database in automatic undo mode and you specify a datafile name for the SYSTEM tablespace, then Oracle Database expects to generate datafiles for all tablespaces. By specifying a displacement from UTC (Coordinated Universal Time--formerly Greenwich Mean Time).
Oracle Database normalizes all TIMESTAMP WITH LOCAL TIME ZONE data to the time zone of the database when the data is stored on disk. Scripting on this page enhances content navigation, but does not change the content in any way. Use the ALTER TABLESPACE statement to alter an existing tablespace or one or more of its data files or temp files. You cannot use this statement to convert a dictionary-managed tablespace to a locally managed tablespace.
If you have the ALTER TABLESPACE system privilege, then you can perform any ALTER TABLESPACE operation. The tablespace must not be involved in an open backup, because the end of a backup updates the header file of all data files in the tablespace.
Performing this function in restricted mode may help you meet these restrictions, because only users with RESTRICTED SESSION system privilege can be logged on.
If you specify the DEFAULT clause, then you must specify at least one of the clauses table_compression, inmemory_clause, ilm_clause, or storage_clause. You cannot make the SYSTEM tablespace read only or temporary and you cannot take it offline.
For locally managed temporary tablespaces, the only clause you can specify in this statement is the ADD clause.
The clauses table_compression, inmemory_clause, ilm_clause, and storage_clause have the same semantics in CREATE TABLESPACE and ALTER TABLESPACE.
Restriction on MINIMUM EXTENT You cannot specify this clause for a locally managed tablespace or for a dictionary-managed temporary tablespace. For each data file in the tablespace, this clause combines all contiguous free extents into larger contiguous extents. If tablespace is read only, then Oracle Database does not update the data file headers to reflect the new name. If you re-create the control file, and if the data files that Oracle Database uses for this purpose are restored backups whose headers reflect the old tablespace name, then the re-created control file will also reflect the old tablespace name. If tablespace has been designated as the undo tablespace for any instance in an Oracle Real Application Clusters (Oracle RAC) environment, and if a server parameter file was used to start up the database, then Oracle Database changes the value of the UNDO_TABLESPACE parameter for that instance in the server parameter file (SPFILE) to reflect the new tablespace name.
The RENAME clause does not change the value of the UNDO_TABLESPACE parameter in the running instance. Restriction on Renaming Tablespaces You cannot rename the SYSTEM or SYSAUX tablespaces. Use these clauses to move all data files in a tablespace into or out of online (sometimes called hot) backup mode.


Specify BEGIN BACKUP to indicate that an open backup is to be performed on the data files that make up this tablespace. You cannot specify this clause for a read-only tablespace or for a temporary locally managed tablespace.
While the backup is in progress, you cannot take the tablespace offline normally, shut down the instance, or begin another backup of the tablespace. Restriction on Ending Tablespace Backup You cannot use this clause on a read-only tablespace. Specify ADD to add to the tablespace a data file or temp file specified by file_specification.
For locally managed temporary tablespaces, this is the only clause you can specify at any time. If you omit file_specification, then Oracle Database creates an Oracle Managed File of 100M with AUTOEXTEND enabled. You can add a data file or temp file to a locally managed tablespace that is online or to a dictionary managed tablespace that is online or offline. Restriction on Adding Data Files and Temp Files You cannot specify this clause for a bigfile (single-file) tablespace, as such a tablespace has only one data file or temp file. On some operating systems, Oracle does not allocate space for a temp file until the temp file blocks are actually accessed. Specify DROP to drop from the tablespace an empty data file or temp file specified by filename or file_number. Cannot be in a read-only tablespace that was migrated from dictionary managed to locally managed.
Use these clauses to take all data files or temp files in the tablespace offline or put them online. Specify LOGGING if you want logging of all tables, indexes, and partitions within the tablespace.
When an existing tablespace logging attribute is changed by an ALTER TABLESPACE statement, all tables, indexes, and partitions created after the statement will have the new default logging attribute (which you can still subsequently override). If the tablespace is in FORCE LOGGING mode, then you can specify NOLOGGING in this statement to set the default logging mode of the tablespace to NOLOGGING, but this will not take the tablespace out of FORCE LOGGING mode.
Use this clause to put the tablespace in force logging mode or take it out of force logging mode. Restriction on Force Logging Mode You cannot specify FORCE LOGGING for an undo or a temporary tablespace.
Specify an empty string (' ') to remove tablespace from the tablespace_group_name tablespace group. Restriction on Tablespace Groups You cannot specify a tablespace group for a permanent tablespace or for a dictionary-managed temporary tablespace. Before taking a tablespace offline for a long time, consider changing the tablespace allocation of any users who have been assigned the tablespace as either a default or temporary tablespace.
Restriction on Taking Tablespaces Offline You cannot take a temporary tablespace offline.
OFFLINE NORMAL Specify NORMAL to flush all blocks in all data files in the tablespace out of the system global area (SGA).
OFFLINE TEMPORARY If you specify TEMPORARY, then Oracle Database performs a checkpoint for all online data files in the tablespace but does not ensure that all files can be written.
OFFLINE IMMEDIATE If you specify IMMEDIATE, then Oracle Database does not ensure that tablespace files are available and does not perform a checkpoint. Specify READ WRITE to indicate that write operations are allowed on a previously read-only tablespace. Specify PERMANENT to indicate that the tablespace is to be converted from a temporary to a permanent tablespace.
Specify TEMPORARY to indicate that the tablespace is to be converted from a permanent to a temporary tablespace.
If tablespace was not created with a standard block size, then you cannot change it from permanent to temporary. Use this clause to specify whether this tablespace should participate in any subsequent FLASHBACK DATABASE operation. For you to turn FLASHBACK mode off, the database must be mounted, either open READ WRITE or closed. Altering a tablespace logging attribute has no affect on the logging attributes of the existing schema objects within the tablespace. This statement erases all data in any specified data files that already exist in order to prepare them for initial database use. Specify the initial sizing of the data files section of the control file at CREATE DATABASE or CREATE CONTROLFILE time. The number of data files accessible to your instance is also limited by the initialization parameter DB_FILES. A bigfile tablespace contains only one data file or temp file, which can contain up to approximately 4 billion (232) blocks.
A smallfile tablespace is a traditional Oracle tablespace, which can contain 1022 data files or temp files, each of which can contain up to approximately 4 million (222) blocks. In all these cases, the parameter settings must correctly specify operating system filenames or creation form Oracle ASM filenames, as appropriate. This parameter is useful only if you are using Oracle Database in ARCHIVELOG mode with Oracle Real Application Clusters (Oracle RAC). If you specify this clause, then the database must have a default temporary tablespace, because a locally managed SYSTEM tablespace cannot store temporary segments. If you specify EXTENT MANAGEMENT LOCAL but you do not specify the DATAFILE clause, then you can omit the default_temp_tablespace clause. If you specify both EXTENT MANAGEMENT LOCAL and the DATAFILE clause, then you must also specify the default_temp_tablespace clause and explicitly specify a temp file for that temporary tablespace.
If you specify EXTENT MANAGEMENT LOCAL but you do not specify the DATAFILE clause, then you can omit the undo_tablespace clause.
If you specify both EXTENT MANAGEMENT LOCAL and the DATAFILE clause, then you must also specify the undo_tablespace clause and explicitly specify a data file for that tablespace. The syntax for specifying data files for the SYSTEM tablespace is the same as that for specifying data files during tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Oracle ASM or in a file system or raw device. If you are running the database in automatic undo mode and you specify a data file name for the SYSTEM tablespace, then Oracle Database expects to generate data files for all tablespaces.
You must specify this clause if you have specified one or more data files for the SYSTEM tablespace using the DATAFILE clause. If you have enabled Oracle Managed Files and you omit the SYSAUX clause, then the database creates the SYSAUX tablespace as an online, permanent, locally managed tablespace with one data file of 100 MB, with logging enabled and automatic segment-space management.
The syntax for specifying data files for the SYSAUX tablespace is the same as that for specifying data files during tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Oracle ASM or in a file system or raw device. The syntax for specifying temp files for the default temporary tablespace is the same as that for specifying temp files during temporary tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Oracle ASM or in a file system or raw device. If you have opened the instance in automatic undo mode (the UNDO_MANAGEMENT initialization parameter is set to AUTO, which is the default), then you can specify the undo_tablespace to create a tablespace to be used for undo data. The syntax for specifying data files for the undo tablespace is the same as that for specifying data files during tablespace creation using the CREATE TABLESPACE statement, whether you are storing files using Oracle ASM or in a file system or raw device. If you specify this clause, then Oracle Database creates an undo tablespace named tablespace, creates the specified data file(s) as part of the undo tablespace, and assigns this tablespace as the undo tablespace of the instance.
By specifying a displacement from UTC (Coordinated Universal Time—formerly Greenwich Mean Time).
Les problemes qui nous emmene a la recuperation d’une base donnees c’est : – La perte d’un fichier de journalisation. If you specify the database name as a quoted identifier, then the quotation marks are silently ignored. The DB_NAME initialization parameter must be set in the database initialization parameter file, and if you specify a different name from the value of that parameter, then the database returns an error. Normally you use this clause only when you are re-creating a database, rather than creating one for the first time.
These parameters are MAXLOGFILES, MAXLOGMEMBERS, MAXLOGHISTORY, MAXDATAFILES, and MAXINSTANCES. An attempt to add a file whose number is greater than MAXDATAFILES, but less than or equal to DB_FILES, causes the Oracle Database control file to expand automatically so that the datafiles section can accommodate more files. The supported character sets and default value of this parameter depend on your operating system. Use the redo_log_file_spec form of file_specification to create regular redo log files in an operating system file system or to create Automatic Storage Management disk group redo log files.
All redo log files specified in a CREATE DATABASE statement are added to redo log thread number 1. Oracle Database uses this value to determine how much space to allocate in the control file for the names of redo log files. Specify the maximum number of archived redo log files for automatic media recovery of Real Application Clusters. After creating the database, you can change between archivelog mode and noarchivelog mode with the ALTER DATABASE statement.
Oracle Database will log all changes in the database except for changes in temporary tablespaces and temporary segments. That is, if you shut down and restart the database, the database is still in FORCE LOGGING mode.
Please refer to Oracle Database Administrator's Guide for information on when to use this setting.
Oracle Database will create a default temporary tablespace called TEMP with one datafile of size 10M with autoextend disabled.
Specify either BIGFILE or SMALLFILE to set the default type of subsequently created tablespaces as a bigfile or smallfile tablespace, respectively. Use this clause if you are not using Oracle-managed files and you want to specify one or more datafiles for the SYSAUX tablespace. If you are using Oracle-managed files and you omit this clause, then the database creates the SYSAUX datafiles in the default location set up for Oracle-managed files.
Oracle Database creates a smallfile tablespace and subsequently will assign to this tablespace any non-SYSTEM users for whom you do not specify a different permanent tablespace.
Oracle Database will assign to this temporary tablespace any users for whom you do not specify a different temporary tablespace.
If you have not specified a value for this parameter, then the TEMPFILE clause is required. This delay in space allocation results in faster creation and resizing of tempfiles, but it requires that sufficient disk space is available when the tempfiles are later used.
A bigfile tablespace contains only one datafile, which can be up to 8 exabytes (8 million terabytes) in size.
A smallfile tablespace is a traditional Oracle Database tablespace, which can contain 1022 datafiles, each of which can be up to 4 MB in size. If you have not specified a value for this parameter, then the DATAFILE clause is required. If these names differ, then Oracle Database will return an error when you open the database. This undo tablespace allocates disk space from the default files used by the CREATE DATABASE statement, and it has an initial extent of 10M.


Therefore, to avoid ambiguity, if your intention is to specify a datafile for the SYSTEM tablespace with this clause, then do not specify it immediately after an undo_tablespace clause that does not include the optional DATAFILE clause. To see a listing of valid region names, query the TZNAME column of the V$TIMEZONE_NAMES dynamic performance view. Doing so can improve performance, especially across databases, as no conversion of time zones will be required. If you do not specify the SET TIME_ZONE clause, then the database uses the operating system time zone of the server.
Therefore no file specification is needed for the DEFAULT TEMPORARY TABLESPACE and UNDO TABLESPACE clauses.
For this reason, the SYSTEM tablespace can never be made read only, because it contains the SYSTEM rollback segment. For complete information on these clauses, refer to DEFAULT Clause in the documentation on CREATE TABLESPACE. The MINIMUM EXTENT clause lets you control free space fragmentation in the tablespace by ensuring that every used or free extent in a tablespace is at least as large as, and is a multiple of, the value specified in the size_clause. However, after the database is fully recovered, the control file will reflect the new name.
If a single-instance database is using a parameter file (pfile) instead of an spfile, then the database puts a message in the alert log advising the database administrator to change the value manually in the pfile. If the UNDO_TABLESPACE parameter is set to the new tablespace name in the pfile or spfile, then the parameter will be set correctly when the instance is next restarted. Use the datafile_tempfile_spec form of file_specification (see file_specification) to list regular data files and temp files in an operating system file system or to list Oracle Automatic Storage Management disk group files. This delay in space allocation results in faster creation and resizing of temp files, but it requires that sufficient disk space is available when the temp files are later used.
This clause causes the data file or temp file to be removed from the data dictionary and deleted from the operating system. If tablespace is SYSTEM, or an undo tablespace, or the default temporary tablespace, then the database must not be open.
The tablespace-level logging attribute can be overridden by logging specifications at the table, index, and partition levels.
Use this clause to add tablespace to or remove it from the tablespace_group_name tablespace group. If tablespace_group_name does not already exist, then Oracle Database implicitly creates it when you alter tablespace to be a member of it.
While the tablespace is offline, such users cannot allocate space for objects or sort areas in the tablespace. Files that are offline when you issue this statement may require media recovery before you bring the tablespace back online.
In this state, existing transactions can complete (commit or roll back), but no further DML operations are allowed to the tablespace except for rollback of existing transactions that previously modified blocks in the tablespace. Use this clause to enable or disable autoextension of the single data file in the tablespace. The KEEP clause is omitted, so the database will attempt to shrink the tablespace as much as possible as long as other tablespace storage attributes are satisfied. An initialization parameter file with the name of the database to be created must be available, and you must be in STARTUP NOMOUNT mode. An attempt to add a file whose number is greater than MAXDATAFILES, but less than or equal to DB_FILES, causes the Oracle Database control file to expand automatically so that the data files section can accommodate more files. Use the redo_log_file_spec form of file_specification to create regular redo log files in an operating system file system or to create Oracle ASM disk group redo log files. Specify the maximum number of archived redo log files for automatic media recovery of Oracle RAC. After creating the database, you can change between ARCHIVELOG mode and NOARCHIVELOG mode with the ALTER DATABASE statement.
If you shut down and restart the database, then the database is still in FORCE LOGGING mode.
Refer to Oracle Database Administrator's Guide for information on when to use this setting. Oracle Database will create a default temporary tablespace called TEMP with one data file of size 10M with autoextend disabled.
Therefore, to avoid ambiguity, if your intention is to specify a data file for the SYSTEM tablespace with this clause, then do not specify it immediately after an undo_tablespace clause that does not include the optional DATAFILE clause.
Use this clause if you are not using Oracle Managed Files and you want to specify one or more data files for the SYSAUX tablespace.
If you are using Oracle Managed Files and you omit this clause, then the database creates the SYSAUX data files in the default location set up for Oracle Managed Files. A bigfile tablespace contains only one data file, which can be up to 8 exabytes (8 million terabytes) in size. A smallfile tablespace is a traditional Oracle Database tablespace, which can contain 1022 data files or temp files, each of which can contain up to approximately 4 million (222) blocks. To see a listing of valid time zone region names, query the TZNAME column of the V$TIMEZONE_NAMES dynamic performance view. Un tablespace peut s'etendre soit par ajout (on-line) d'un fichier, soit par auto-extension du fichier du tablespace. Pour modifier les donnees d'un Tablespace READ ONLY il est evidemment obligatoire de modifier prealablement son statut.
Please refer to "Schema Object Naming Guidelines" for additional rules to which database names should adhere. When you create a database for the first time, Oracle Database creates a control file in the default destination, which is dependent on the value or several initialization parameters.
When using a form of ASM_filename, you cannot specify the autoextend_clause of redo_log_file_spec. The database uses this value to determine how much space to allocate in the control file for the names of archived redo log files. This setting takes precedence over and is independent of any NOLOGGING or FORCE LOGGING settings you specify for individual tablespaces and any NOLOGGING settings you specify for individual database objects.
However, if you re-create the control file, Oracle Database will take the database out of FORCE LOGGING mode unless you specify FORCE LOGGING in the CREATE CONTROLFILE statement. If you do not specify this clause, then the SYSTEM tablespace is the default permanent tablespace for non-SYSTEM users.
If you do not specify this clause, and if the database does not create a default temporary tablespace automatically in the process of creating a locally managed SYSTEM tablespace, then the SYSTEM tablespace is the default temporary tablespace.
To avoid potential problems, before you create or resize a tempfile, ensure that the available disk space exceeds the size of the new tempfile or the increased size of a resized tempfile. However, if you want undo space management to be handled by way of rollback segments, then you must omit this clause.
The DATAFILE clause of this clause has the same behavior as described in "DATAFILE Clause". Use the datafile_tempfile_spec form of file_specification to create regular datafiles and tempfiles in an operating system file system or to create Automatic Storage Management disk group files. If you do so, Oracle Database will interpret the DATAFILE clause to be part of the undo_tablespace clause. However, if you are not using Oracle-managed files and you specify this clause, then you must also specify the undo_tablespace clause and the default_temp_tablespace clause. If the operating system time zone is not a valid Oracle Database time zone, then the database time zone defaults to UTC. Additionally, because the rollback segments of a read-only tablespace are not accessible, Oracle recommends that you drop the rollback segments before you make a tablespace read only.
Use K, M, G, or T to specify the size in kilobytes, megabytes, gigabytes, or terabytes, respectively. In the optional KEEP clause, the size_clause defines the lower bound that a tablespace can be shrunk to. Otherwise, if an instance failure or SHUTDOWN ABORT occurs, then Oracle Database assumes that media recovery (possibly requiring archived redo log) is necessary at the next instance startup.
To avoid potential problems, before you create or resize a temp file, ensure that the available disk space exceeds the size of the new temp file or the increased size of a resized temp file.
In the optional KEEP clause, the size_clause defines the lower bound that the temp file can be shrunk to. Each filename must fully specify a data file using the conventions for filenames on your operating system.
To enable or disable autoextension of a newly added data file or temp file in smallfile tablespaces, use the autoextend_clause of the database_file_clauses in the ALTER DATABASE statement. Refer to "Database Object Naming Rules" for additional rules to which database names should adhere. However, if you re-create the control file, then Oracle Database will take the database out of FORCE LOGGING mode unless you specify FORCE LOGGING in the CREATE CONTROLFILE statement. Use the data file_tempfile_spec form of file_specification to create regular data files and temp files in an operating system file system or to create Oracle ASM disk group files. If you do so, then Oracle Database will interpret the DATAFILE clause to be part of the undo_tablespace clause.
However, if you are not using Oracle Managed Files and you specify this clause, then you must also specify the undo_tablespace clause and the default_temp_tablespace clause. The excess space should allow for anticipated increases in disk space use by unrelated operations as well. You can also omit this clause if you have set a value for the UNDO_TABLESPACE initialization parameter. If Oracle Database is unable to create the undo tablespace, then the entire CREATE DATABASE operation fails. However, Oracle recommends that you use the transportable tablespaces feature for tablespace recovery. If you subsequently issue an ALTER DATABASE statement that explicitly specifies a database name, Oracle Database verifies that name with the name in the control file. The default value is a multiple of the MAXINSTANCES value and depends on your operating system. If that parameter has been set, and if you specify this clause, then tablespace must be the same as that parameter value. If you omit the KEEP clause, then the database will attempt to shrink the tablespace as much as possible as long as other tablespace storage attributes are satisfied.
If you omit the KEEP clause, then the database will attempt to shrink the temp file as much as possible as long as other storage attributes are satisfied. If you subsequently issue an ALTER DATABASE statement that explicitly specifies a database name, then Oracle Database verifies that name with the name in the control file.
You can examine the GROUP value for a redo log file group through the dynamic performance view V$LOG.



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