Microsoft Access Performance FAQ. Microsoft Access Performance FAQ - LDB locking which a persistent recordset connection fixes (Last updated 2010/09/27) When the symptoms encountered indicate that performance is acceptable with a single user in the database but drops significantly when two or more users are in the database, the problem may be caused by interaction with the LDB file. In Access 2000, when a second and subsequent user tries to access a shared backend database on the server, there seems to be a situation where Access tries to perform a delete on the LDB file (which fails because another user is currently in the file). This attempt is made about 15 times before silently failing and the records are returned from the linked table. To resolve this issue we need a persistent connection to the back-end from each of the front-end workstations.
This can be done using a bound form which is always open or by keeping a recordset open at all times.. Bound form DoCmd.OpenForm "frmKeepOpen", acNormal, , , , acHidden. Microsoft Access Performance FAQ. Microsoft Access Performance FAQ (Last updated 2013-01-05) Some of these were originally suggested by Frank Miller of Microsoft Support and have been extensively updated and added since. Almost all of these tips also apply to Microsoft Access 97 and all newer versions of Access. The most common performance problems in Access are: - LDB locking which a persistent recordset connection fixes - Subdatasheet Name property set to [Auto] should be [None].
(Access 2000 and newer. See my note in the section below.) - Track name AutoCorrect should be off. (Access 2000 and newer) Other reasons are - Creating indexes for filtering and selection criteria and sequencing. - Speed up your Access Forms by loading the form, subform, combobox and listbox record sources at run-time When every user is slow opening up the front end (FE) database file before the first line of code is run then it likely needs a decompile.
Access 2000 slow when using an Access 97 backend. Subdatasheet Name property set to [Auto] Remote Queries In Microsoft Access. What Is A Remote Query ? It always amazes me how I can keep stumbling across features that I never ever noticed or read about in the 8 years that I have been programming Access databases. This article discusses one of those hidden gems that I discovered when investigating Access Automation. Whilst looking into that technology, I stumbled across a SQL help topic in Access that described an extension that allows you to point your current query to a table in another database. This in itself didn't seem all that interesting because I had been doing this for years using Linked tables. The "In Database" Clause Extension To SQL As you will probably be very familiar with switching from query design mode to SQL queries, a remote query can be best described with the following example of SQL SELECT [Orders Qry].* FROM [Orders Qry] IN 'C:\msoffice97\Office\Samples\Northwind.mdb'; This example opens the orders query from my local Northwind database.
How Do You Set Up A Remote Query Manually ? If Me! Forced Exit Macro Vis-a-vis Autoexec?
Create User Form Using VBA - VBA Visual Basic for Applications (Microsoft) FAQ. Sometimes you need to create a complex UserForm with many components. I had to create a form with 3 labels, 1 text box and a check box for 43 different records (215 separate components) and so developed this technique of programatically creating the form. Obviously one can manually create a complex UserForm but the problem of individually naming each component and writing the event handler codes is a real drag.
The references that need to be loaded are: Visual Basic For Applications Microsoft Excel Object Library MS Forms 2.0 Object Library The code below is based on John Walkenbach's original procedure. I tend not to delete the form but build up a series of UserForms (I refer to them as TestForms) - one generated each time the code is run. When satisfied I can rename the final TestForm to an appropriate name, add any other components such as command buttons and other event handler codes, and then delete all the remailing TestForms.
Creating a Form and Controls (Buttons, Listboxes etc.) at runtime with VBA code.
DAvg Function. Learn how to use the Access DAvg function with syntax and examples. Description The Microsoft Access DAvg function returns the average of a set of numeric values from an Access table (or domain). Syntax The syntax for the Microsoft Access DAvg function is: DAvg ( expression, domain, [criteria] ) Parameters or Arguments expression is the numeric values that you wish to average. domain is the set of records. Criteria is optional. Applies To The DAvg function can be used in the following versions of Microsoft Access: Access 2013, Access 2010, Access 2007, Access 2003, Access XP, Access 2000 Example Let's look at a simple example: DAvg("UnitPrice", "Order Details", "OrderID = 10248") In this example, you would be averaging the UnitPrice field in the Order Details table where the OrderID is 10248.
SELECT Avg([Order Details].UnitPrice) AS AvgOfUnitPrice FROM [Order Details] WHERE ((([Order Details].OrderID)=10248)); You can also average more than one numeric field. Example (in VBA Code)
ListBox. Move a Record (Up/Down) Continuous Record.