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Docmd.outputto Acformat Really Odd

Hey guys,

I noticed some quite peculiar. I have an acces 97 database which uses the DoCmd.OutPutTo to output about 13,000 records from a query to an Excell 2007 spreadsheet. This takes about 6 seconds to complete in 97. After converting the database to Access 2007 format and running the same code it takes about 13 seconds.

Here is the original line of code that does the exporting:

VB:

DoCmd.OutputTo acOutputQuery, "TimeServDownload", acFormatXLS, "C:\DataIntegrityCheck.xls", True 


If you like these VB formatting tags please consider sponsoring me in support of injured Royal Marines



After playing around the with third argument, the acFormat I noticed that changing this argument to any integer value other than acFormatXLS speed up the action significantly.

For example:

VB:

 
DoCmd.OutputTo acOutputQuery, "TimeServDownload", 0, "C:\DataIntegrityCheck.xls", True 


If you like these VB formatting tags please consider sponsoring me in support of injured Royal Marines



Will take about 4 seconds to output to Excell 2007 in Access 2007, reducing the time it originally took by 9 seconds.

Why does using the acFormatXLS constant slow things down so much? Would it be safe to continue to use 0 in place of acFormatXLS? Speed is a big concern for me.

My only guess is that acFormatXLS causes it to export using an old Excel format. After browsing around it seems that Excel doesn't particularly care what file format you use because it works with header information instead. It's still weird that this should slow things down.

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Thank-you