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Taking the Storage tab shown in Figure 5-4 gives access to options for extent management and compression, as shown in Figure 5-6
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Figure 5-6
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Further options for tablespace creation
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5: Oracle Storage
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When using local extent management (as all tablespaces should), it is possible to enforce a rule that all extents in the tablespace should be the same size This is discussed in the following section If enabling compression, then it can be applied to data only when it is bulk-loaded, or as a part of all DML operations If logging is disabled, this provides a default for the very few operations where redo generation can be disabled, such as index creation Whatever setting is chosen, all DML operations will always generate redo TIP All tablespaces should be locally managed The older mechanism, known as dictionary managed, was far less efficient and is only supported (and only just) for backward compatibility It has been possible to create locally managed tablespaces, and to convert dictionary-managed tablespaces to locally managed, since release 8i A typical tablespace creation statement as executed from the SQL*Plus command line is shown in Figure 5-7, with a query confirming the result The tablespace STORETABS consists of two datafiles, neither of which will autoextend The only deviation from defaults has been to specify a uniform extent size of 5MB The first query in the figure shows that the tablespace is not a bigfile tablespace if it were, it would not have been possible to define two datafiles The second query in the figure investigates the TEMP tablespace, used by the database for storing temporary objects It is important to note that temporary tablespaces use tempfiles, not datafiles Tempfiles are listed in the views V$TEMPFILE PART I
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Figure 5-7 Tablespace creation and verification with SQL*Plus
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and DBA_TEMP_FILES, whereas datafiles are listed in V$DATAFILE and DBA_DATA_ FILES Also note that the V$ views and the DBA views give different information As the query shows, you can query V$TABLESPACE to find if a tablespace is a bigfile table and V$TEMPFILE (or V$DATAFILE) to find how big a file was at creation time This information is not shown in the DBA views However, the DBA views give the detail of extent management and segment space management The different information available in the views is because some information is stored only in the controlfile (and therefore visible only in V$ views) and some is stored only in the data dictionary (and therefore visible only in DBA views) Other information is duplicated
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The changes made to tablespaces after creation are commonly Renaming Taking online and offline Flagging as read-write or read only Resizing Changing alert thresholds
Rename a Tablespace and Its Datafiles
The syntax is
ALTER TABLESPACE tablespaceoldname RENAME TO tablespacenewname;
This is very simple but can cause problems later Many sites rely on naming conventions to relate tablespaces to their datafiles All the examples in this chapter do just that: they embed the name of the tablespace in the name of the datafiles Oracle doesn t care: internally, it maintains the relationships by using the tablespace number and the datafile (or tempfile) number These are visible as the columns V$TABLESPACE TS# and V$DATAFILEFILE# If your site does rely on naming conventions, then it will be necessary to rename the files as well A tablespace can be renamed while it is in use, but to rename a datafile, the datafiles must be offline This is because the file must be renamed at the operating system level, as well as within the Oracle environment, and this can t be done if the file is open: all the file handles would become invalid Figure 5-8 demonstrates an example of the entire process, using the tablespace created in Figure 5-7 In the figure, the first command renames the tablespace That s the easy part Then the tablespace is taken offline (as described in the following section), and two operating system commands rename the datafiles in the file system Two ALTER DATABASE commands change the filenames as recorded within the controlfile, so that Oracle will be able to find them Finally the tablespace is brought back online
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