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Rebuilding a database consists of unloading and reloading the database to upgrade its file format. When you upgrade the file format, it changes the format used to store and access data on disk, letting you use all the new features and performance enhancements in the latest version of the software.
Unloading and reloading a large database can be time consuming and can require a large amount of disk space. The process may require disk space approximately twice the size of your database to hold the unloaded data and the new database file.
Because of index changes in SQL Anywhere, when you rebuild a database by unloading and reloading it, the rebuilt database may be smaller than the original database. This decrease in database size does not indicate a problem or a loss of data.
It is recommended that you back up your database before you rebuild it.
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