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The use of the server-generated alert system will be described in 24 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 5-3, then in the Edit Tablespace window take the Thresholds tab Figure 5-10 shows this for the EXAMPLE tablespace
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The alert thresholds for the EXAMPLE tablespace
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In the figure, the Available Space in the tablespace is reported as 32GB This is clearly incorrect, because the Allocated Space, as displayed in Figure 5-3, is only 100MB 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 platform-dependent limit, in this case 32GB Of course, this says nothing about whether the file system has room for a file that size The alert system uses the maximum possible 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 PART I
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To drop a tablespace, use the DROP TABLESPACE command The syntax is
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DROP TABLESPACE tablespacename [INCLUDING CONTENTS [AND DATAFILES] ] ;
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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 drop the objects first, and then to drop the tablespace Even this will fail in some circumstances, such as if the tablespace contains 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 TIP On Windows systems, you may find the datafiles are still there after using the INCLUDING CONTENTS AND DATAFILES clause This 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
OCA/OCP Oracle Database 11g All-in-One Exam Guide
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 in the CREATE TABLESPACE command Exercise 5-2: Create, Alter, and Drop Tablespaces In this exercise, you will create tablespaces and change their characteristics Then enable and use OMF The exercise can be done through Database Control, but if so, be sure to click the SHOW SQL button at all stages to observe the SQL statements being generated 1 Connect to the database as user SYSTEM 2 Create a tablespace in a suitable directory any directory on which the Oracle owner has write permission will do:
create tablespace newtbs datafile '/home/db11g/oradata/newtbs_01dbf' size 10m extent management local autoallocate segment space management auto;
This command specifies the options that are the default Nonetheless, it may be considered good practice to do this, to make the statement selfdocumenting 3 Create a table in the new tablespace, and determine the size of the first extent:
create table newtab(c1 date) tablespace newtbs; select extent_id,bytes from dba_extents where owner='SYSTEM' and segment_name='NEWTAB';
4 Add extents manually, and observe the size of each new extent by repeatedly executing this command,
alter table newtabs allocate extent;
followed by the query from Step 3 Note the point at which the extent size increases 5 Take the tablespace offline, observe the effect, and bring it back online This is shown in the following illustration
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