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nvl((sum(e.used_bytes)*100)/sum(df.bytes),0) pct_used, FROM DBA_DATA_FILES df (SELECT file_id SUM(nvl(bytes,0)) used_bytes FROM dba_extents GROUP BY file_id) e, (SELECT MAX(bytes) free_bytes, file_id FROM dba_free_space GROUP BY file_id) f WHERE e.file_id(+) = df.file_id AND df.file_id = f.file_id(+) GROUP BY df.tablespace_name ORDER BY 5 DESC
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Tablespace Name --------------PERSON_INFO_I PERSONS_I LABELS_I . . . CBC_I QUEST TEST2 Grand Total SQL>
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Size (MB) -----2,299 26348 2,038 501 10 10 -------291,528
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Used (MB) -----2,245 6,185 1,980 7 0 0 ------224,473
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The DBA_TEMP_FILES view is analogous to the DBA_DATA_FILES view, and shows the temporary tablespace temp file information.
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DBA_TABLESPACE_GROUPS
You can group a set of temporary tablespaces together into a temporary tablespace group. The DBA_TABLESPACE_GROUPS view shows you all the tablespace groups in your database. You can also find out the individual tablespace name in each group by using this view.
V$DATAFILE
The V$DATAFILE view contains information about the datafile name, the tablespace number, the status, the time stamp of the last change, and so on. The V$TEMPFILE view shows you particulars about the temporary tablespace files. The V$DATAFILE view provides important information when you join it to the V$FILESTAT view.
V$FILESTAT
The V$FILESTAT view provides you with detailed data on file read/write statistics, including the number of physical reads and writes, the time taken for that I/O, and the average read and write times in milliseconds. The V$TABLESPACE view provides information about the tablespaces. Listing 6-9 shows how you can join the V$DATAFILE, V$TABLESPACE, and V$FILESTAT views to obtain useful disk I/O information.
CHAPTER 6 MA NAGING TA BLESPA CES
Listing 6-9. Getting Disk I/O Information SQL> 2 3 4 5 6 7* SELECT d.name, t.name, f.phyrds, f.phywrts, f.readtim, f.writetim FROM V$DATAFILE d, V$FILESTAT f, V$TABLESPACE t WHERE f.file# = d.file# AND d.ts# = t.ts#; T.NAME -----SYSTEM PHYRDS -----46180 PHYWRTS ------98697 READTIM ------29637 WRITETIM --------473716
NAME ---------C:\ORACLEN T\ORADATA\ MANAGER\SY STEM01.DBF C:\ORACLEN T\ORADATA\ MANAGER\UN DOTBS01.DBF C:\ORACLEN T\ORADATA\ MANAGER\DR SYS01.DBF C:\ORACLEN T\ORADATA\ MANAGER\IN DX01.DBF SQL>
UNDOTBS
DRSYS
INDX
Easy File Management with Oracle Managed Files
The previous sections have dealt with operating system file management, where you, the DBA, manually create, delete, and manage the datafiles. Oracle Managed Files enable you to bypass dealing with operating system files directly. As you learned in 5, in an Oracle database, you deal with various types of database files, including datafiles, control files, and online redo log files. In addition, you also have to manage tempfiles for use with temporary tablespaces, archived redo logs, RMAN backup files, and files for storing flashback logs. Normally, you d have to set the complete file specification for each of these files when you create one of them. Under an OMF setup, however, you specify the file system directory for all the previously mentioned types of Oracle files by specifying three initialization parameters: DB_CREATE_FILE_DEST, DB_CREATE_ONLINE_LOG_DEST_n, and DB_RECOVERY_FILE_DEST. Oracle will then automatically create the files in the specified locations without your having to provide the actual location for it. OMF offers a simpler way of managing the file system you don t have to worry about specifying long file specifications when you re creating tablespaces or redo log groups or control files. When you want to create a tablespace or add datafiles when using OMF, you don t have to give a location for the datafiles. Oracle will automatically create the file or add the datafile in the location you specified in the init.ora file for datafiles. Note that you don t have to use a DATAFILE or TEMPFILE clause when creating a tablespace when you use the OMF-based file system. Here are a couple of examples showing how simple it is to create a tablespace and add space to it under an OMF system: SQL> CREATE TABLESPACE finance01; SQL> ALTER TABLESPACE finance01 ADD DATAFILE 500M;
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