TAILIEUCHUNG - Oracle Essbase 9 Implementation Guide- P73

Oracle Essbase 9 Implementation Guide- P73:Essbase is a multidimensional database management system. The name Essbase stands for Extended Spread Sheet dataBASE. Using the custom add-in provides the end-user with near seamless compatibility in the Microsoft Excel spreadsheet program. | Chapter 9 The Data file cache setting is the size of the buffer used to load the database page files into memory. This setting is only relevant if you have your database set to Direct I O. Buffered I O is the default and on all but the largest of data loads has tweaking this setting made any noticeable difference. The Data file cache setting can be set as large as the combined total size of all of the database page files. On a 30GB database setting the page file cache size may not be practical or even possible especially if you only have 16 GB of system RAM For the Data cache setting it is usually fine left where it is at the default setting of 3072KB. The recommended maximum size is times the size of the Data file cache setting. Only change this setting if you are experiencing performance issues and have many concurrent users accessing the database. The Index page setting is a static number and cannot be set by you. Oracle has determined that 8KB is sufficient for a database index page size. For better performance Oracle advises to keep all of Z-X the databases set to use Buffered I O or Direct I O 1 and not a combination of both settings on the same physical server. Data load and storage settings We will now briefly cover the available options for optimizing your system s data loading and data storage capabilities. As is always recommended the default settings are in most cases more than adequate so you should make any changes carefully and test each one fully to determine if the change is warranted or not. 345 Download at Advanced Techniques On the Transactions tab of Database Properties screen seen in the previous screenshot you will see options for Committed access and Uncommitted access. If you select Committed access Essbase will hold all of the data blocks involved in a transaction until the changes or updates are committed to the system. This can be a problem for you because Essbase will keep duplicates of the data blocks until the time .

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