php - Wordpress - Custom posts fails to export - too many entries? -


i think stackoverflow question , not serverfault question... if i'm wrong apologize!

i trying export custom post type has around 500,000 entries. when export custom post type has few entries, exports successfully.

but second export post type 500,000 entries (by going tools->export), receive following error:

this webpage not available err_invalid_response   firefox can't find file @ http://website.com/wp-admin/export.php?download=true&cat=0&post_author=0&post_start_date=0&post_end_date=0&post_status=0&page_author=0&page_start_date=0&page_end_date=0&page_status=0&content=card&submit=download+export+file. 

this resulting 500 error wordpress:

[12/jun/2015:10:51:47 -0400] "get /wp-admin/export.php?download=true&cat=0&post_author=0&post_start_date=0&post_end_date=0&post_status=0&page_author=0&page_start_date=0&page_end_date=0&page_status=0&content=card&submit=download+export+file http/1.1" 500 20 "-" "mozilla/5.0 (x11; linux x86_64) applewebkit/537.36 (khtml, gecko) chrome/43.0.2357.81 safari/537.36" 

i've tried increasing upload_max_filesize unfortunately has no effect. i'm not able find useful information in normal logs. temporarily enabled debug logging within wordpress , following errors logged when tried export:

[12-jun-2015 14:56:40 utc] php notice: undefined index: rewrite_withfront in /home/account/public_html/wp-content/plugins/custom-post-type-ui/custom-post-type-ui.php on line 265  [12-jun-2015 14:56:40 utc] php notice: undefined index: rewrite_hierarchical in /home/account/public_html/wp-content/plugins/custom-post-type-ui/custom-post-type-ui.php on line 266  [12-jun-2015 14:56:40 utc] php notice: has_cap called argument deprecated since versiaccounton 2.0! usage of user levels plugins , themes deprecated. use roles , capabilities instead. in /home/account/public_html/wp-includes/functions.php on line 3508  [12-jun-2015 14:56:40 utc] php notice: undefined index: page in /home/account/public_html/wp-content/plugins/order-categories/category-order.php on line 20 

how export 500,000 posts within custom post type?


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