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The Workspace Manager enables simultaneous read and write access to production data during long transactions. It uses multiple versioning of tables to enable the simultaneous reading and writing of data. Consistency is guaranteed because the final, permanent version of the table will not have any conflicts within the data. All the users see their own virtual version of the database that is, different versions of the rows in the same tables. But the versions each user sees from his or her workspace are guaranteed to be transactionally consistent; the user s versions will have the original data the user started with, plus all the changes he or she made to the original data.

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Among other things, the Workspace Manager enables you to try out various scenarios with your data (such as the effects of different marketing campaigns) before you finally settle on one acceptable version that you can make permanent by merging all the virtual versions of the table data. Merging, in effect, incorporates the child workspace data with the original (parent workspace) data. If, after analysis, you decide to nullify all the child workspace s data, you can do so by rolling it back, just like you would roll back a transaction under normal circumstances.

Although the Workspace Manager provides you with the capability to create multiple versions of one table, or even of all the tables in your database, it doesn t impose a severe storage cost because only the changed rows in each workspace are versioned, and these new versions are saved in the original table (and in the original tablespace). In other words, you don t need to make any special storage allocations for the database tables that belong to different versions.

The Workspace Manager offers the following features: You can maintain multiple versions of data, which you can keep or discard as necessary. Multiple users can simultaneously access and modify the same data. The updates made by several users over time are isolated in workspaces until they re merged into the production database. Conflicts between multiple versions are resolved automatically by the Workspace Manager.

Like the script in 36, this script will construct and run an ed script, which allows us to edit the shadow file in place when changes need to be made. This is discussed in more detail in 25. First we have to remove any previously created ed script files that may be lying around.

The concepts of table versioning and workspaces are the foundation of the Workspace Manager feature. Table versioning enables you to have different sets of rows sharing the same table name. The amazing thing about table versioning is that users can continue to change data through DML operations on a day-to-day basis. The Workspace Manager maintains the structure of the versioned tables using views based on the original production table. This ability to version-enable even production tables makes the Workspace Manager very powerful in performing what-if analyses. You can use the WM$VERSIONED_TABLES and WM$VERSION_TABLE tables to find out details about the versioned tables. The WMSYS schema owns both of these tables, so first make sure that you have the WMSYS schema in your database. Workspaces enable users to make changes to versions of a table, and the workspaces isolate the versioned tables until they re finally discarded or merged with the original table. This ability of the workspaces to save the versioned tables means that access to the original tables isn t impeded. You can assign each workspace to one or several users, and they can see a consistent view of the database, including the rows in their versions of the tables in the workspace, plus all the other tables at the time the workspaces were either created or refreshed, whichever is later.