We are dealing with the exact same error. Exporting only part of the results works fine, but exporting all 10.000 responses result in the error you describe. Nothing in error logs and no special configuration. PHP.ini is already optimized to deal with larger data.
PHP.ini is already optimized to deal with larger data.
Probably not, if you are getting the error when exporting all 10.000, but having no problem with a smaller sample.
And you have two aspects here: "large data" AND "long execution of scripts". Did you have a look into the limit for the execution time for scripts? Because the script to create the data file might run into limits there.
Help us to help you!
Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.