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Microsoft Access Performance Increase the Speed of Your Access Databases. Over 1. 00 Tips for Faster Microsoft Access Databases. This paper outlines.
Microsoft Access. These tips apply to all versions of Access including Access.
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Some of the tips may contradict. Some tips may make things run faster on your. You should evaluate each tip as it applies to your. Good luck! Normalize Your Tables. Normalize your data so the same data is stored only in one place. Read our paper on Data.
Normalization Fundamentals for more detail. Every Table Should Have a Primary. Key. Every table in your database should have. This allows your database application to quickly locate specific records. Primary keys define the uniqueness of each record which can be.
The easiest is using an. Auto. Number field in Access or Identity column in SQL Server.
The primary key. is also used in each secondary index for that table, so the smaller the. Multi- field primary keys and non- numeric text fields are less. That said, some tables should simply use text fields as primary keys. For. instance, a list of countries or states (no need to create a separate number. Having a meaningless primary key means the index is stable even when data.
Otherwise, changes in the primary key have a ripple effect through. Tables Should Participate in Relationships. Related tables with one- to- one or one- to- many relationships should. With cascading deletes, the removal.
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Access (the Jet Engine) automatically takes care of. With a relationship established, a hidden index is created for the.
The link. is also automatically drawn for you when you put the two tables on your. Eliminate Unnecessary Subdatasheets. By default, Access creates subdatasheet views between related tables.
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Set this property to None if you don't want it. Here's more. information on the.
Subdatasheet Name Property. Choose the Optimal Data Types. Choose the best data types for your.
By choosing the optimal data type, you can decrease both the disk space used to. Access to retrieve, manipulate, and write data. The. general guideline is to choose the smallest data type possible to store a particular type. Add Secondary Indexes As Necessary. If your tables are large and you search on a field or use it in a join. Secondary Indexes offer performance gains on an order of. Don't Over- Index.
Just as it is important to add indexes to. Every. index adds to the time it takes the database engine to update, delete and add records. Don't Index Fields with Lots of. Identical Data. Don't apply indexes to fields that. For example, indexing a Yes/No field is almost always a. Similarly, if you have a number field that only contains. To check the number of unique.
Access Distinct. Count property. Compare this value to the. Keep Indexes As Small As Possible.
When creating a multi- field index, index. Keep an Open Handle to Every Linked Database.
You can significantly increase the performance of. Microsoft Access keep the linked table's database open. To do this, open a Database variable in Visual. Basic code using the Open.
Database method. Keep this variable open as long as your. This forces Access to keep that database open, making access to. For more information, read our tip on. Increasing the. Performance of Linked Databases. Minimize Record Navigation. Minimize record navigation wherever possible.
SQL Server tables. Only use the Page Up.
Page Down movements, and the Move last movements. Use Data. Entry Mode. If you are only going to be adding. Data. Entry command on the Records menu. This data access method is more.
Create a Data Entry Form. If you often have the need to add new. This prevents Access from attempting to retrieve all the. Limit the Data Returned by Queries. Limit the number of fields and records. This reduces the amount of data that needs to be.
Don't Use Domain Aggregate. Functions. If a query is based on one or more linked. When you use domain aggregate functions (such as DLookup), Access must. Release Locks ASAPTo improve multi- user concurrency, assume. This makes opening that table much faster in.
This is because linked tables cache a lot of information about the. Minimize Server Traffic. Minimize the amount of data returned from. Do this by structuring your queries to return only the fields and records. Reduce the number of fields returned, and put constraints on the query by using. WHERE clause. Use Snapshots When Appropriate. Don't open Dynaset type recordset object.
SQL database tables unless you need to add or edit records, or need to see the changes. Instead, consider using Snapshot recordsets which can be faster to. Of course, Snapshot recordsets can take longer to open since they require. Use Dynasets for Large Record Sets. If you need to retrieve a large number of.
Dynaset instead of a Snapshot. Snapshot type recordsets must load all. Dynasets are available as. Also, when using a Snapshot against. ODBC data sources, you run the risk of running out of disk space on your local. This is because all data is downloaded into RAM until the amount of RAM is. Then, the database engine creates a temporary database to store the contents of.
In a nutshell, when you open a snapshot, you need at least as much disk. Take Advantage of the Cache.
Use cache memory wherever possible when. SQL data sources. Microsoft Access forms and reports have automatic caching. When using recordsets in your Visual Basic code, use the Cache. Start, Cache. End. Fill. Cache methods to maximize cache effectiveness. Don't Force Local Query Processing.
Don't use query constructs that cause. Access on the local computer. The following query operations.
Jet database engine to perform local data processing: Join operations between table that are. I. e. In. many cases, it is a faster and more flexible way to hit server data than. Jet/Linked table technique. Split Your Database into Two. Databases. You can improve performance and.
Access database into two databases. For. more information, read our technical paper. Microsoft Access Databases to Improve Performance and Simplify.
Maintainability. Use a Current Workgroup. Information File. If you are using a workgroup information. SYSTEM. MDA) created with a previous version of MS Access, convert it to the current.
Access for optimum performance. Use the Access Performance. Analyzer. Microsoft Access has a useful performance tool. From the Tools menu, select Analyze, Performance. The. Performance Analyzer allows you to select all objects or specific objects, and then runs. The Performance Analyzer does not find all of. Total Access Analyzer.
Run the Microsoft Access Table Analyzer. The Access Table Analyzer makes it easy. This tool is available from the Access. Tools, Analyze menu. Reduce the Size of Graphics in your Microsoft Access 2. Later Databases. If you embed graphics on your forms or reports, Access 2.
Access 2. 00. 7 can convert graphics into much. PNG formats to significantly reduce the size of your databases. This. does not affect graphics already on your forms and reports but helps if you. To activate this feature, change. Access setting. From the Access Office button, choose Access Options. Current Database.
At the bottom of the Application Options section, set the. Picture Property Storage Format to: Preserve source image format (smaller. Compact Your Database Often To. Reclaim Space. Compacting your database reclaims unused. You should do this on a regular basis. Also. be sure to compact anytime you import or delete objects in your database, or compile and.
VBA code. Learn more about Total Visual Agent for a system. Access databases on a regular. Make It Look Faster. If you have exhausted all other. Do this by displaying status messages and progress meters as your application. When you. compact the database, you reorganize records so that they are stored in adjacent spaces. Additionally, compacting a database updates its data statistics.
You can force a query to recompile (which in. You may want to defragment your disk. Disk Defragmenter that is part of Windows before compacting. This leaves contiguous free disk space immediately after the database file.
You may want to. experiment with this on your system. Index Query Criteria Fields and. Join Fields. Index any fields in the query that are.
Index the fields on both sides of a join. Alternatively, you can. Search Access Help for: Index. Use Identical or Compatible Datatype In Join Fields. Fields that are joined in query should.
For example, the Long Integer Data. Type. is compatible with the Auto. Number data type. Limit Fields Returned by a Query.
Where possible, limit the number of. This results in faster performance and reduced resource usage. Avoid Calculated Fields and IIF. Functions. Avoid calculated fields, or fields that. Pay special care to avoid the use of immediate If (IIF).
Don't Use Non- Indexed Fields for. Criteria. Avoid using non- indexed fields or. Index Sort Fields.
Index any fields you use for sorting. Be. careful not to over- index. Use Temporary Tables to Eliminate Running the Same Queries Over and Over.
If you are processing data that's used multiple times (for instance on. Select queries many times.
Empty the table and fill it. Append query. You can then use that table for. Avoid Domain Aggregate Functions. Foreign Tables. Do not use domain aggregate functions. DLookup for example) in queries to access data from a table that is not in the query. The Count(*) form is faster because it doesn't have to. Null values in the specified field and won't skip records that are.
Compile Each Query Before. Delivering Your Application.
When you compact your database, its data. When you then run a query, these updated statistics are compiled.
This sequence of events results in the fastest possible. Before you deliver your application, compact the database, and then force each. You can force a query to recompile (which in turn causes it to use. Take Advantage of Rushmore Query. Optimization. Microsoft Jet uses Rushmore query.
Rushmore is applied to queries run on native Access data. Fox. Pro and d. BASE tables. Other linked data types do not support Rushmore.