Using Extracts with Global Projects

An extract is created from an existing database. When an Extract is created, it will be empty, with pointers back to the owning or master database . Thus all data visible in the master will be visible in the extract. Extracts can only be created from Multiwrite databases, and all extracts are themselves Multiwrite. The user can create Extract DBs from any type of database that can be multiwrite, that is DESI, PADD, CATA and ISOD, and in the case of Marine projects, MANU and SCHE.

• Extracts from foreign DBs cannot be created.

• Extracts from copy DBs cannot be created.

The user can work on an extract at the same time as another user is working on the master or another extract. When a user works on the extract, elements are claimed to the extract in a similar way to simple multiwrite databases, so no other User can work on them. When an extract User does a SAVEWORK, the changed data will be saved to the Extract. The unchanged data will still be read via pointers back to the master DB. When appropriate, the changes made to the extract are written back to the master. Also, the extract can be updated when required with changes made to the master.