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  1. 22 Nov, 2018 1 commit
  2. 07 Nov, 2018 1 commit
    • Toon Claes's avatar
      Enhance performance of counting local Uploads · f6b3ec32
      Toon Claes authored
      Add an index to the `store` column on `uploads`. This makes counting
      local uploads faster.
      
      Also, there is no longer need to check for objects with `store = NULL`.
      See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557
      
      ---
      
      ### Query plans
      
      Query:
      
      ```sql
      SELECT COUNT(*)
      FROM "uploads"
      WHERE ("uploads"."store" = ? OR "uploads"."store" IS NULL)
      ```
      
      #### Without index
      
      ```
      gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                        QUERY PLAN
      ---------------------------------------------------------------------------------------------------------------
       Seq Scan on uploads  (cost=0.00..601729.54 rows=578 width=272) (actual time=6.170..2308.256 rows=545 loops=1)
         Filter: ((store = 1) OR (store IS NULL))
         Rows Removed by Filter: 4411957
       Planning time: 38.652 ms
       Execution time: 2308.454 ms
      (5 rows)
      ```
      
      #### Add index
      
      ```
      gitlabhq_production=# create index uploads_tmp1 on uploads (store);
      CREATE INDEX
      ```
      
      #### With index
      
      ```
      gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                                QUERY PLAN
      -------------------------------------------------------------------------------------------------------------------------------
       Bitmap Heap Scan on uploads  (cost=11.46..1238.88 rows=574 width=272) (actual time=0.155..0.577 rows=545 loops=1)
         Recheck Cond: ((store = 1) OR (store IS NULL))
         Heap Blocks: exact=217
         ->  BitmapOr  (cost=11.46..11.46 rows=574 width=0) (actual time=0.116..0.116 rows=0 loops=1)
               ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..8.74 rows=574 width=0) (actual time=0.095..0.095 rows=545 loops=1)
                     Index Cond: (store = 1)
               ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..2.44 rows=1 width=0) (actual time=0.020..0.020 rows=0 loops=1)
                     Index Cond: (store IS NULL)
       Planning time: 0.274 ms
       Execution time: 0.637 ms
      (10 rows)
      ```
      
      Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6070
      f6b3ec32
  3. 21 Aug, 2018 1 commit