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Performance Considerations
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Access always performs best when working with its own files on your local machine. If you link tables or files from other databases, you might notice slower performance. In particular, you can expect slower performance if you connect over a network to a table or a file in another database, even if the remote table is an Access table. You won t see any performance difference if you link to Access tables in another .mdb file on your local machine. When sharing data over a network, you should consider how you and other people can use the data in a way that maximizes performance. For example, instead of working directly with the tables, you should work with queries on the shared data whenever possible to limit the amount of data you need at any one time. When inserting new data in a shared table, you should use an Access form that is set only for data entry so that you don t have to access the entire table to add new data.
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See 7, Creating and Working with Simple Queries, 12, Customizing a Form, 18, Building Views, Functions, and Stored Procedures, 23, Automating Your Application with Visual Basic, and 31, Distributing Your Application, for more information.
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Part 2: Building a Microsoft Access Desktop Application
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You can view and set options for multiple users sharing data by choosing Options from the Tools menu and clicking the Advanced tab of the Options dialog box, as shown in Figure 6-12 on the next page. The original settings for these options are often appropriate when you share data over a network, so it s a good idea to consult your system administrator before making changes.
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Part 1: Part Title
Microsoft Office Access 2003 Inside Out
Part 2: Building a Microsoft Access Desktop Application
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Figure 6-12. The Options dialog box with the Advanced tab selected.
One very important consideration is record locking. When Access needs to update data in a shared file, it must lock the data to ensure no other machine is trying to write the same data at the same time. You should set options so that records are not locked if you are simply browsing through data. Even if your application frequently updates and inserts data, you should leave Default record locking set to No locks. With this setting, Microsoft Access 2003 locks individual records only for the short period of time that it is writing the row, so the chance of receiving an update error while two users are trying to update the same row at the exact same time is very small. If you want to ensure that no one else can change a record that you have begun to update, you should set Default record locking to Edited record. Note, however, that no other user will be able to edit a record that another has begun to change. If a user begins to type a change in a record and then goes off for lunch, no one else will be able to change that record from another machine until that user either saves the row or clears the edit.
Inside Out
Leave default record locking alone I never set either All records or Edited record as the default. Either one can cause extra overhead while updating data and can lock out other users unnecessarily. In the rare case that an update conflict occurs with No locks, Access gives the second user the opportunity to refresh the data and reenter the blocked update. Also, you can set record locking individually in forms and reports. See 12, Customizing a Form, and 16, Advanced Report Design, for details.
Part 1: Part Title
Importing and Linking Data You can set options to limit the number of times Access will retry an update to a locked record and how long it will wait between retries. You can also control how often Access reviews updates made by other users to shared data by setting the refresh interval. If this setting is very low, Access will waste time performing this task repeatedly. Microsoft Access 97 (version 8) and earlier locked an entire 2-KB page each time you updated, inserted, or deleted rows. This meant that only one user at a time could update any of the rows stored physically within the page. The page size in Access 2000 increased to 4 KB, but Access 2000 (version 9) and later also support record-level locking that eliminates locking collisions when two users attempt to update different rows stored on the same data storage page. Unless you are designing an application that frequently needs to update hundreds of rows at a time (for example, with action queries), you should leave the Open databases using record-level locking check box selected.
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