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Writing Excel in java takes hours to create.

Waez Ali
Ranch Hand

Joined: Jan 24, 2005
Posts: 43

I have a program that executes a sql and write the extract into excel sheet, the resulset of sql fetched is about 400k and whole process is taking 3 to 4 hours.

Any suggestions how I can improve the time..?

Steve Luke

Joined: Jan 28, 2003
Posts: 4181

The first thing is to figure out which step takes a long time so that you know whatever effort you put into optimizing gets applied to the correct place.

Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42955
What does "400k" mean - 400000 rows? 400KB of data? Something else?

I agree with Steve that the first step is to figure what's taking up all that time - reading the data from the DB, or writing to an Excel file.
Debal Guha

Joined: Feb 21, 2013
Posts: 9

which API are you using? POI/Jxl or any other?

You just need to know where to find it!!
It is sorta covered in the JavaRanch Style Guide.
subject: Writing Excel in java takes hours to create.