Contact Us. Table of Contents:. Not only this but you can also do amendment and create an automatic calculation software in it which will be just simply get calculated in stored in some table. Using Oracle 10g is the most easiest thing to do yet it needs some required specific skill to develop but to be just a user, it is just as easy as eating a cereal.
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In this case, only the files taken offline because of errors need to be recovered before the tablespace can be brought online.
You can bring any tablespace in an Oracle Database online whenever the database is open. A tablespace is normally online so that the data contained within it is available to database users. Otherwise, the database returns an error and the tablespace remains offline. Oracle Database Backup and Recovery Basics. Making a tablespace read-only prevents write operations on the datafiles in the tablespace. The primary purpose of read-only tablespaces is to eliminate the need to perform backup and recovery of large, static portions of a database.
Read-only tablespaces also provide a way to protecting historical data so that users cannot modify it. Making a tablespace read-only prevents updates on all tables in the tablespace, regardless of a user's update privilege level. You can drop items, such as tables or indexes, from a read-only tablespace, but you cannot create or alter objects in a read-only tablespace. Read-only tablespaces can be transported to other databases.
The tablespace must be online. This is necessary to ensure that there is no undo information that needs to be applied to the tablespace. The tablespace must not currently be involved in an online backup, because the end of a backup updates the header file of all datafiles in the tablespace.
For better performance while accessing data in a read-only tablespace, you can issue a query that accesses all of the blocks of the tables in the tablespace just before making it read-only. This eliminates the need for the database to check the status of the transactions that most recently modified the blocks. After the statement is issued, the tablespace is put into a transitional read-only state.
No transactions are allowed to make further changes using DML statements to the tablespace. If a transaction attempts further changes, it is terminated and rolled back.
However, transactions that already made changes and that attempt no further changes are allowed to commit or roll back. You can then notify the owners of those transactions and decide whether to terminate the transactions, if necessary. Displaying this view sorted by ascending start SCN lists the transactions in execution order. All transactions with smaller start SCN, which indicates an earlier execution, can potentially hold up the quiesce and subsequent read-only state of the tablespace.
After making the tablespace read-only, it is advisable to back it up immediately. As long as the tablespace remains read-only, no further backups of the tablespace are necessary, because no changes can be made to it.
Making a read-only tablespace writable updates the control file entry for the datafiles, so that you can use the read-only version of the datafiles as a starting point for recovery. Create a writable tablespace on another device. Create the objects that belong in the tablespace and insert your data. Copy the datafiles of the tablespace onto the WORM device. Use operating system commands to copy the files. Rename the datafiles to coincide with the names of the datafiles you copied onto your WORM device.
Renaming the datafiles changes their names in the control file. This speeds certain operations, primarily opening the database, by causing datafiles in read-only tablespaces to be accessed for the first time only when an attempt is made to read data stored within them.
A missing or bad read-only file is not detected at open time. It is only discovered when there is an attempt to access it. They are checked only upon the first access. Read-only files have a size of "0" listed. Logs they could need for recovery are not added to the list. It proceeds even if there is a read-only file that requires recovery. If you want to avoid accessing read-only files for these operations, those files should be taken offline.
If a backup control file is used, the read-only status of some files may be inaccurate. This can cause some of these operations to return unexpected results. Care should be taken in this situation. For example, the following statement renames the users tablespace:. When you rename a tablespace the database updates all references to the tablespace name in the data dictionary, control file, and online datafile headers.
If any datafile in the tablespace is offline, or if the tablespace is offline, then the tablespace is not renamed and an error is raised. If the tablespace is read only, then datafile headers are not updated. This should not be regarded as corruption; instead, it causes a message to be written to the alert log indicating that datafile headers have not been renamed.
The data dictionary and control file are updated. If the tablespace is an undo tablespace and if the following conditions are met, then the tablespace name is changed to the new tablespace name in the server parameter file SPFILE. If a traditional initialization parameter file PFILE is being used then a message is written to the alert log stating that the initialization parameter file must be manually changed.
You can drop a tablespace and its contents the segments contained in the tablespace from the database if the tablespace and its contents are no longer required. When you drop a tablespace, the file pointers in the control file of the associated database are removed. You can optionally direct Oracle Database to delete the operating system files datafiles that constituted the dropped tablespace.
If you do not direct the database to delete the datafiles at the same time that it deletes the tablespace, you must later use the appropriate commands of your operating system to delete them.
You cannot drop a tablespace that contains any active segments. For example, if a table in the tablespace is currently being used or the tablespace contains undo data needed to roll back uncommitted transactions, you cannot drop the tablespace. The tablespace can be online or offline, but it is best to take the tablespace offline before dropping it. The following statement drops the users tablespace, including the segments in the tablespace:.
The following statement drops the users tablespace and its associated datafiles:. A message is written to the alert log for each datafile that is deleted. Later you discover that Ultra Search is using up too much space. The SYSAUX tablespace is occupied by a number of database components see Table , and its total size is governed by the space consumed by those components. The space consumed by the components, in turn, depends on which features or functionality are being used and on the nature of the database workload.
The space consumed by the AWR is determined by several factors, including the number of active sessions in the system at any given time, the snapshot interval, and the historical data retention period. A typical system with an average of 30 concurrent active sessions may require approximately to MB of space for its AWR data. You can control the size of the AWR by changing the snapshot interval and historical data retention period.
The size of this repository depends on database activity and on configuration-related information stored in the repository. If the features are not used, then these components do not have any significant effect on the size of the SYSAUX tablespace. You cannot drop a segment because the bitmap has segment blocks marked "free".
The system has automatically marked the segment corrupted. If no overlaps are reported, then proceed with steps 2 through 5. Some of the real data must be sacrificed based on previous internal errors. After choosing the object to be sacrificed, in this case say, table t1 , perform the following tasks:. Drop table t1. This operation is done online, but space management operations are blocked until the migration has been completed. This means that you can read or modify data while the migration is in progress, but if you are loading a large amount of data that requires the allocation of additional extents, then the operation may be blocked.
Allow the system to choose the bitmap allocation unit. If you choose to specify an allocation unit size, it must be a factor of the unit size calculated by the system.
The following statement performs the migration:. There is at least one online rollback segment in a locally managed tablespace, or if using automatic undo management, an undo tablespace is online. All tablespaces other than the tablespace containing the undo space that is, the tablespace containing the rollback segment or the undo tablespace are in read-only mode.
This section describes how to transport tablespaces between databases, and contains the following topics:. You can use the Transportable Tablespaces feature to copy a set of tablespaces from one Oracle Database to another. The tablespaces being transported can be either dictionary managed or locally managed. Starting with Oracle9 i , the transported tablespaces are not required to be of the same block size as the target database standard block size.
These scenarios are discussed in "Using Transportable Tablespaces: Scenarios". Manually, following the steps described in this section. Starting with Oracle Database 10 g , you can transport tablespaces across platforms. This functionality can be used to:. Provide an easier and more efficient means for content providers to publish structured data and distribute it to customers running Oracle Database on different platforms.
Simplify the distribution of data from a data warehouse environment to data marts, which are often running on smaller platforms. Enable the sharing of read-only tablespaces between Oracle Database installations on different operating systems or platforms, assuming that your storage system is accessible from those platforms and the platforms all have the same endianness, as described in the sections that follow. Many, but not all, platforms are supported for cross-platform tablespace transport.
The following query displays the platforms that support cross-platform tablespace transport:. If the source platform and the target platform are of different endianness, then an additional step must be done on either the source or target platform to convert the tablespace being transported to the target format. If they are of the same endianness, then no conversion is necessary and tablespaces can be transported as if they were on the same platform.
Before a tablespace can be transported to a different platform, the datafile header must identify the platform to which it belongs. Oracle Oracle MySQL 8. PostgresSQL 9. Samsung Android 11 Knox 3. Samsung Android OS 10 with Knox 3. Samsung Android OS 9 with Knox 3. SCC 5. Splunk Enterprise 7. STIG Viewer 2. Sunset - AIX 6. Sunset - Apple OS X Sunset - BlackBerry OS
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