Tips to improve subform performance in Access.

[Karleen]

Actually I am working on the software project. My instructor has said that the performance of your software depends on the data base design of your software project. I have tried my level best to design the data base as good as possible. But it will be better if my sub form perform better. So need to know the tips for improving the performance of subform in Access.

[Computer_Freak]

I will like to mention some of the tips for improving the performance subform in Access.
1. It will better if you design your subform on the bases of queries rather than designing on the bases of tables.
2. Do not include the extra fields from the record source it will be better if you include the most important fields. Because the extra record will decrease the subform performance.
3. It will be better if you index all the fields in the subform that have a link to main form.
4. Indexes help to improve the performance.

[FlashX]

I will give you the tips with the help of an example.
If you want to link multiple fields, then adding a calculated field to the main form that will concatenate the fields. After that create a calculated column for the subforms.
For example, to link to the subform on an Customer ID field and an Category ID field, add a text box to the main form with the following properties:
Name: CustomerIDCategoryID
ControlSource: =[CustomerID] & [CategoryID]
Next, add the following field to the query that the subform is based on:
CustomerIDCategoryID: [Customer ID] & [Category ID]
Finally, link the main form and the subform on the concatenated field rather than on the two individual fields. The subform properties may appear as follows:
LinkChildFields: CustomerIDCategoryID
LinkMasterFields: CustomerIDCategoryID
Because Microsoft Access has to compare only one criteria to return the subform's recordset, the subform's performance should improve.