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The third required file type making up a database is the datafile At a minimum, you must have two datafiles, to be created at database creation time With previous releases of Oracle, you could create a database with only one datafile 10g and 11g require two, at least one each for the SYSTEM tablespace (that stores the data dictionary) and the SYSAUX tablespace (that stores data that is auxiliary to the data dictionary) You will, however, have many more than that when your database goes live, and will usually create a few more to begin with Datafiles are the repository for data Their size and numbers are effectively unlimited A small database, of only a few gigabytes, might have just half a dozen datafiles of only a few hundred megabytes each A larger database could have thousands of datafiles, whose size is limited only by the capabilities of the host operating system and hardware The datafiles are the physical structures visible to the system administrators Logically, they are the repository for the segments containing user data that the programmers see, and also for the segments that make up the data dictionary A segment is a storage structure for data; typical segments are tables and indexes Datafiles can be renamed, resized, moved, added, or dropped at any time in the lifetime of the database, but remember that some operations on some datafiles may require downtime At the operating system level, a datafile consists of a number of operating system blocks Internally, datafiles are formatted into Oracle blocks These blocks are consecutively numbered within each datafile The block size is fixed when the datafile is created, and in most circumstances it will be the same throughout the entire database The block size is a matter for tuning and can range (with limits depending on the platform) from 2KB up to 64KB There is no relationship between the Oracle block size and the operating system block size TIP Many DBAs like to match the operating system block size to the Oracle block size For performance reasons, the operating system blocks should never be larger than the Oracle blocks, but there is no reason not have them smaller For instance, a 1KB operating system block size and an 8KB Oracle block size is perfectly acceptable.

Within a block, there is a header section and a data area, and possibly some free space The header section contains information such as the row directory, which lists the location within the data area of the rows in the block (if the block is being used for a table segment) and also row locking information if there is a transaction working on the rows in the block The data area contains the data itself, such as rows if it is part of a table segment, or index keys if the block is part of an index segment When a user session needs to work on data for any purpose, the server process supporting the session locates the relevant block on disk and copies it into a free buffer in the database buffer cache If the data in the block is then changed (the buffer is dirtied) by executing a DML command against it, eventually DBWn will write the block back to the datafile on disk EXAM TIP Server processes read from the datafiles; DBWn writes to datafiles Datafiles should be backed up regularly Unlike the controlfile and the online redo log files, they cannot be protected by multiplexing (though they can, of course, be protected by operating system and hardware facilities, such as RAID) If a datafile is damaged, it can be restored from backup and then recovered (to recover a datafile means to bring it up to date) by applying all the redo generated since the backup was made The necessary redo is extracted from the change vectors in the online and archive redo log files The routines for datafile backup, restore, and recovery are described in s 15 18

Up to and including release 9i of the Oracle Database, when a table was dropped all references to it were removed from the data dictionary If it were possible to see the source code for the old DROP TABLE command, you would see that it was actually a series of DELETE commands against the various tables in the SYS schema that define a table and its space usage, followed by a COMMIT There was no actual clearing of data from disk, but the space used by a dropped table was flagged as being unused, and thus available for reuse Even though the blocks of the table were still there, there was no possible way of getting to them, because the data dictionary would have no record of which blocks were part of the dropped table The only way to recover a dropped table was to do a point-in-time recovery, restoring a version of the database from before the drop when the data dictionary still knew about the table From release 10g onward of the Oracle Database, the implementation of the DROP TABLE command has been completely changed Tables are no longer dropped at all; they are renamed In Figure 19-2, you can see that a table, OLD_NAME, occupies one extent of 64KB, which starts 38281 blocks into file four After the rename to NEW_NAME, the storage is exactly the same therefore the table is the same Querying the view DBA_OBJECTS OBJECT_ID would show that the table s object number had not changed either

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Use this window to select the type of pattern you want to apply, as well as its blend mode, opacity, and scale When finished, click the OK button To edit the style after it s been applied to the layer, double-click the button

Figure 19-2

.