android barcode scan javascript Resizing a Tablespace in Software

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Resizing a Tablespace
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A tablespace can be resized either by adding datafiles to it or by adjusting the size of the existing datafiles The datafiles can be resized upward automatically as necessary if the AUTOEXTEND syntax was used at file creation time Otherwise, you have to do it manually with an alter database command:
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ALTER DATABASE DATAFILE filename RESIZE n[M|G|T];
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Operations on a read-only tablespace
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Create and Manage Tablespaces
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The M, G, or T refer to the units of size for the file: megabytes, gigabytes, or terabytes For example,
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alter database datafile '/oradata/users02dbf' resize 10m;
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From the syntax, you do not know if the file is being made larger or smaller An upward resize can only succeed if there is enough space in the file system, a resize downward can only succeed if the space in the file is not already in use by extents allocated to a segment To add another datafile of size two gigabytes to a tablespace:
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alter tablespace gl_large_tabs add datafile 'D:\ORADATA\GL_LARGE_TABS_03DBF' size 2g;
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Clauses for automatic extension can be included, or to enable automatic extension later use a command such as this:
alter database datafile 'D:\ORADATA\GL_LARGE_TABS_03DBF' autoextend on next 100m maxsize 4g;
This will allow the file to double in size, increasing 100 MB at a time
Changing Alert Thresholds
The use of the server-generated alert system will be described in 13 For now it is only necessary to know that the MMON process of the instance monitors, in near real time, how full every tablespace is If a tablespace fills up beyond a certain point, MMON will raise an alert The default alert levels are to raise a warning alert when a tablespace is over 85 percent full, and a critical alert when it is over 97 percent full The alerts can be seen in several ways, but the easiest is to look at the database home page of Database Control, where they are displayed in the Alerts section To view or change the alert levels, select the tablespace and click the Edit button, visible in Figure 7-4, then in the Edit Tablespace window take the Thresholds tab Figure 7-11 shows this for the EXAMPLE tablespace In the figure, the Available space in the tablespace is reported as 32 GB This is clearly incorrect, because the Allocated Space, as displayed in Figure 7-4, is only 100 MB The answer lies in datafile autoextension If AUTOEXTEND is enabled for a datafile and no MAXSIZE is specified, then the file can grow to a platformdependent limit, in this case 32 GB Of course, this says nothing about whether the file system has room for a file that size The alert system uses the maximum possible
7:
Managing Database Storage Structures
FIGURE 7-11
The alert thresholds for the EXAMPLE tablespace
size of the tablespace as the basis for its calculations, which is meaningless if the tablespace s datafiles were created with the syntax AUTOEXTEND ON MAXSIZE UMLIMITED, or if a MAXSIZE was not specified It should be apparent that when using automatic extension, it is good practice to set a maximum limit This can be done from the command line with an ALTER DATABASE command, or through Database Control That having been done, use of Database Control to set thresholds is self-explanatory
Dropping Tablespaces
To drop a tablespace, use the DROP TABLESPACE command The syntax is
DROP TABLESPACE tablespacename [INCLUDING CONTENTS [AND DATAFILES] ] ;
If the INCLUDING CONTENTS keywords are not specified, the drop will fail if there are any objects in the tablespace Using these keywords instructs Oracle to
Create and Manage Tablespaces
drop the objects first, and then to drop the tablespace Even this will fail in some circumstances, such as the tablespace containing a table that is the parent in a foreign key relationship with a table in another tablespace If the AND DATAFILES keywords are not specified, the tablespace and its contents will be dropped but the datafiles will continue to exist on disk Oracle will know nothing about them anymore, and they will have to be deleted with operating system commands On Windows systems, you may find the datafiles are still there after using the INCLUDING CONTENTS AND DATAFILES clauseThis is because of the way Windows flags files as locked It may be necessary to stop the Windows Oracle service (called something like OracleServiceORCL) before you can delete the files manually
Oracle-Managed Files (OMF)
Use of OMF is intended to remove the necessity for the DBA to have any knowledge of the file systems The creation of database files can be fully automated To enable OMF, set some or all of these instance parameters:
DB_CREATE_FILE_DEST DB_CREATE_ONLINE_LOG_DEST_1 DB_CREATE_ONLINE_LOG_DEST_2 DB_CREATE_ONLINE_LOG_DEST_3 DB_CREATE_ONLINE_LOG_DEST_4 DB_CREATE_ONLINE_LOG_DEST_5 DB_RECOVERY_FILE_DEST
The DB_CREATE_FILE_DEST parameter specifies a default location for all datafiles The DB_CREATE_ONLINE_LOG_DEST_n parameters specify a default location for online redo log files DB_RECOVERY_FILE_DEST sets up a default location for archive redo log files and backup files As well as setting default file locations, OMF will generate filenames and (by default) set the file sizes Setting these parameters can greatly simplify file-related operations Having enabled OMF, it can always be overridden by specifying a datafile name on the CREATE TABLESPACE command
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