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ops$tkyte%ORA11GR2> !oerr ora 12913 12913, 00000, "Cannot create dictionary managed tablespace" // *Cause: Attemp to create dictionary managed tablespace in database // which has system tablespace as locally managed // *Action: Create a locally managed tablespace. Note that Oerr is a Unix-only utility; on non-Unix platforms, you ll need to refer to the Oracle Error Messages documentation for the details on the error you receive.
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Note You might wonder why I wrote It s not that dictionary-managed tablespaces are not supported in a
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database where SYSTEM is locally managed, it s that they simply can t be created. If they can t be created, why would we need to support them The answer lies in the transportable tablespace feature. You can transport a dictionary-managed tablespace into a database with a SYSTEM tablespace that is locally managed. You can plug that tablespace in and have a dictionary-managed tablespace in your database, but you can t create one from scratch in that database.
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The inability to create dictionary-managed tablespaces is a positive side effect, as it prohibits you from using the legacy storage mechanism, which was less efficient and dangerously prone to space fragmentation. Locally-managed tablespaces, in addition to being more efficient in space allocation and deallocation, also prevent tablespace fragmentation. We ll take an in-depth look at this in 10 Database Tables.
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Temporary data files (temp files) in Oracle are a special type of data file. Oracle will use temporary files to store the intermediate results of large sort operations and hash operations, as well as to store global temporary table data, or resultset data, when there is insufficient memory to hold it all in RAM. Permanent data objects, such as a table or an index, will never be stored in a temp file, but the contents of a temporary table and its indexes would be. So, you ll never create your application tables in a temp file, but you might store data there when you use a temporary table. Temp files are treated in a special way by Oracle. Normally, every change you make to an object will be recorded in the redo logs; these transaction logs can be replayed at a later date to redo a transaction, which you might do during recovery from failure. Temp files are excluded from this process. Temp files never have REDO generated for them, although they can have UNDO generated. Thus, there will be REDO generated working with temporary tables since UNDO is always protected by REDO, as you will see in detail in 9 Redo and Undo. The UNDO generated for global temporary tables is to support rolling back work you ve done in your session, either due to an error processing data or because of some general transaction failure. A DBA never needs to back up a temporary data file, and, in fact, attempting to do so would be a waste of time, as you can never restore a temporary data file. It is recommended that your database be configured with locally-managed temporary tablespaces. You ll want to make sure that as a DBA, you use a CREATE TEMPORARY TABLESPACE command. You don t want to just alter a permanent tablespace to a temporary one, as you do not get the benefits of temp files that way.
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One of the nuances of true temp files is that if the OS permits it, the temporary files will be created sparse that is, they will not actually consume disk storage until they need to. You can see that easily in this example (on Red Hat Linux): ops$tkyte%ORA11GR2> !df -h /tmp Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 132G 79G 47G 63% / ops$tkyte%ORA11GR2> create temporary tablespace temp_huge 2 tempfile '/tmp/temp_huge.dbf' size 2048m; Tablespace created. ops$tkyte%ORA11GR2> !df -h /tmp Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 132G 79G 47G 63% / ops$tkyte%ORA11GR2> !ls -l /tmp/temp_huge.dbf -rw-rw---- 1 ora11gr2 ora11gr2 2147491840 Jan 20 15:45 /tmp/temp_huge.dbf
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Note The UNIX command df shows disk free space. This command showed that I have 47GB free in the file
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system containing /tmp before I added a 2GB temp file to the database. After I added that file, I still had 47GB free in the file system.
Apparently it didn t take much storage to hold that file. If we look at the ls output, it appears to be a normal 2GB file, but it is, in fact, consuming only a few kilobytes of storage currently. So we could actually create hundreds of these 2GB temporary files, even though we have roughly 47GB of disk space free. Sounds great free storage for all! The problem is, as we start to use these temp files and they start expanding out, we would rapidly hit errors stating no more space. Since the space is allocated or physically assigned to the file as needed by the OS, we stand a definite chance of running out of room (especially if after we create the temp files, someone else fills up the file system with other stuff). How to solve this differs from OS to OS. On Linux, you can use dd to fill the file with data, causing the OS to physically assign disk storage to the file, or use cp to create a nonsparse file, for example: ops$tkyte%ORA11GR2> !cp --sparse=never /tmp/temp_huge.dbf /tmp/temp_huge_not_sparse.dbf ops$tkyte%ORA11GR2> !df -h /tmp Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 132G 81G 45G 65% / ops$tkyte%ORA11GR2> drop tablespace temp_huge including contents and datafiles; Tablespace dropped.
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