Pagination: rows, start and cursorMark

Solr sends results one page at a time: rows says how many, start says from which position, counting from 0.

01 · rows and start

var rows = 10;
var pages = Math.ceil(data.response.numFound / rows);
var current = Math.floor(data.response.start / rows) + 1;

02 · Deep pages cost more

To answer start=100000&rows=20, Solr ranks the first 100,020 results again, on every request. Show a few hundred pages at most and refuse deeper requests in your own code. Opensolr checks the traffic of every index daily and emails you when it sees requests deeper than start=100000, which is how a scraper walking your index usually looks.

03 · Every document: cursorMark

To read a whole index (an export, a migration), use a cursor. Its cost stays the same on every page, however deep:

q=*:*&sort=id asc&rows=500&cursorMark=*

04 · Next