For performance reasons, Piwik will by default only archive the first top 500 pages, top 1000 keywords, top 1000 websites, Custom Variables, etc. Piwik will then sum all the remaining pages, keywords, etc. under the label “Others”. If you wish to archive all the data, or simply archive more than the current rows limit, you can override these values in the configuration file config/config.ini.php. For example, to limit all table to 5000 entries, add the following in config/config.ini.php:

[General]
; maximum number of rows for any of the Referers tables (keywords, search engines, campaigns, etc.), and Custom variables names
datatable_archiving_maximum_rows_referers = 5000
; maximum number of rows for any of the Referers subtable (search engines by keyword, keyword by campaign, etc.), and Custom variables values
datatable_archiving_maximum_rows_subtable_referers = 5000
; maximum number of rows for any of the Actions tables (pages, downloads, outlinks)
datatable_archiving_maximum_rows_actions = 5000
; maximum number of rows for pages in categories (sub pages, when clicking on the + for a page category)
datatable_archiving_maximum_rows_subtable_actions = 5000
; maximum number of rows for any of the Events tables (Categories, Actions, Names)
datatable_archiving_maximum_rows_events = 500
; maximum number of rows for sub-tables of the Events tables (eg. for the subtables Categories>Actions or Categories>Names).
datatable_archiving_maximum_rows_subtable_events = 100
; maximum number of rows for the Custom Variables names report
datatable_archiving_maximum_rows_custom_variables = 5000
; maximum number of rows for the Custom Variables values reports
datatable_archiving_maximum_rows_subtable_custom_variables = 5000

After doing this change, if you want your old reports to be re-processed with this new number of rows, see FAQ on how to re-process reports.