運行緩慢簡單的Postgres查詢我有一個Movie
模型大約15,000項和一個Dvd
模型3500在Heroku
下列查詢是使用起重機的Postgres數據庫在Heroku上運行簡單的Rails協會。我想知道爲什麼下面的查詢花了這麼長時間,我怎麼最終減少它的時間。
2012-10-24T05:42:19+00:00 app[postgres]: [30-1] [BLACK] LOG: duration: 57.914 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 37 ORDER BY scene LIMIT 1
2012-10-24T05:42:20+00:00 app[postgres]: [31-1] [BLACK] LOG: duration: 77.086 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 915 ORDER BY scene LIMIT 1
2012-10-24T05:42:20+00:00 app[postgres]: [32-1] [BLACK] LOG: duration: 85.602 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 108 ORDER BY scene LIMIT 1
2012-10-24T05:42:21+00:00 app[postgres]: [33-1] [BLACK] LOG: duration: 70.147 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 11 ORDER BY scene LIMIT 1
2012-10-24T05:42:21+00:00 app[postgres]: [34-1] [BLACK] LOG: duration: 144.204 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 6 ORDER BY scene LIMIT 1
2012-10-24T05:42:22+00:00 app[postgres]: [35-1] [BLACK] LOG: duration: 56.623 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 1956 ORDER BY scene LIMIT 1
2012-10-24T05:42:23+00:00 app[postgres]: [36-1] [BLACK] LOG: duration: 64.860 ms statement: SELECT "movies".* FROM "movies" WHERE "movies"."dvd_id" = 747 ORDER BY scene LIMIT 1
請按照以下要求顯示'EXPLAIN(BUFFERS,ANALYZE)'和其他信息:http://stackoverflow.com/tags/postgresql-performance/info –