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Linked Databases and Linked Tables Keep an Open Handle to Every Linked Database You can significantly increase the performance of opening tables, forms, and reports that are based on linked tables by having Microsoft Access keep the linked table's database open.
Keep this variable open as long as your application is running. This forces Access to keep that database open, making access to linked tables much faster. This data access method is more efficient for adding records because existing records are not read from the database.
Create a Data Entry Form If you often have the need to add new records to a linked table, consider creating an "Add Records" form and set that form's DataEntry property to Yes.
This prevents Access from attempting to retrieve all the existing records in a linked table when you need is to enter new records. Limit the Data Returned by Queries Limit the number of fields and records returned by using filters or queries.
This reduces the amount of data that needs to be read from the linked table, thereby according faster performance. Don't Use Domain Aggregate Functions If a query is based on one or more linked tables, avoid using functions built-in or user-definedor domain aggregate functions in the query criteria.
When you use domain aggregate functions such as DLookupAccess must fetch all records in the function's data source to execute the query.
Release Locks ASAP To improve multi-user concurrency, assume that other users will be trying to edit data in the same linked tables that you are using. In other words, keep records locked only as long as is necessary. This makes opening that table much faster in subsequent attempts.
This is because linked tables cache a lot of information about the source table in your database, making the retrieval of the same structural information unnecessary after the linked table is created. Minimize Server Traffic Minimize the amount of data returned from the server.
Do this by structuring your queries to return only the fields and records needed. Use Snapshots When Appropriate Don't open Dynaset type recordset object on SQL database tables unless you need to add or edit records, or need to see the changes made by other users.
Instead, consider using Snapshot recordsets which can be faster to scroll through. Of course, Snapshot recordsets can take longer to open since they require a full read of the source data.
Snapshot type recordsets must load all records from the data source before becoming available, whereas Dynasets are available as soon as the first 20 or so records are retrieved.
Also, when using a Snapshot against large ODBC data sources, you run the risk of running out of disk space on your local computer. Then, the database engine creates a temporary database to store the contents of the snapshot.
In a nutshell, when you open a snapshot, you need at least as much disk space as the largest table you are opening. Microsoft Access forms and reports have automatic caching mechanisms. Don't Force Local Query Processing Don't use query constructs that cause processing to be done by Access on the local computer.
The following query operations force the Jet database engine to perform local data processing: Join operations between table that are linked to different data source I.m o r e R E L A T E D C O N S I D E R A T I O N S Biased School Desks Right-biased tablet arm school desks can cause many serious problems for left-handers, including back and neck pain and slowing writing to disadvantage the student on important timed tests.
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