On Fri, Dec 28, 2012 at 03:34:02PM -0600, Dan Frankowski wrote: > I am running a benchmark of inserting 100 million (100M) items into a > table. I am seeing performance I don't understand. Graph: > http://imgur.com/hH1Jr. Can anyone explain: > > 1. Why does write speed (writes/second) slow down dramatically around 28M > items?
Most probably, indices became too large to fit in the in-memory cache. You can verify this by tracing system activity: this threshold should manifest itself by drastical increase in _read_ operations on disk(s). > 2. Are there parameters (perhaps related to table size) that would change > this write performance? CACHE_SIZE. It makes sense to enlarge it up to the all available memory. Valentin Davydov. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
