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Oracle data files make up the largest part of the physical storage of your database. A data file can belong to only one database, and one or more data files constitute the logical entity called the tablespace, which I described earlier in this chapter. Oracle data files constitute most of a database s total space. When the database instance needs to read table or index data, it reads that from the data files on disk, unless that data is already cached in Oracle s memory. Similarly, any new table or index data or updates to existing data will be written to the data files for permanent storage.

The control file is a file that the Oracle DBMS maintains to manage the state of the database, and it is probably the single most important file in the Oracle database Every database has one control file, but due to the file s importance, multiple identical copies (usually three) are maintained when the database writes to the control file, all copies of the file get written to The control file is critical to the functioning of the database, and recovery is difficult without access to an up-to-date control file Oracle creates the control file (and the copies) during the initial database creation process.

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The control file contains the names and locations of the data files, redo log files, current log sequence numbers, backup set details, and the all-important system change number (SCN), which indicates the most recent version of committed changes in the database information that is not accessible by users even for reading purposes Only Oracle can write information to the control file, and the Oracle server process continually updates the control file during the operation of the database Control files are vital when the Oracle instance is operating When you turn the instance on, Oracle reads the control file for the location of the data and log files During the normal operation of the database, the control file is consulted periodically for necessary information regarding virtually every structure of the database The control file is also important in verifying the integrity of the database and when recovering the database.

The hiding of the data and the implementation code behind the interface are keys to the successful creation of a business object If the users of an object are allowed to see inside it, they will be tempted to cheat and to interact with the logic or data in unpredictable ways This danger is the reason why it is important to take care when using the Public keyword as you build your classes Any property, method, event, or field marked as Public is available to the users of objects created from the class For example, you might create a simple class such as the following: Public Class Project Private _id As Guid = GuidNewGuid() Public ReadOnly Property Id() As Guid Get Return _id End Get End Property Private _name As String = String.

The checkpoint process instructs the database writer to write data to the disk when some specific conditions are met, and the control file notes all checkpoint information from the online redo log files This information comes in handy during a recovery the checkpoint information in the control file enables Oracle to decide how far back it needs to go in recovering data from the online redo log files The checkpoint indicates the SCN up to which the data files are already written to the data files, so the recovery process will disregard all the information in the online redo log files before the checkpoint noted in the control file When you start an Oracle instance, the control file is consulted first, to identify all the data files and the redo log files that must be opened for database operations..

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