加快 postgresql 中的删除速度

Question

我想出了：

drop table if exists idtemp;
create temp table idtemp as 
      select documentid from taskflag where taskid='coref' and state = 2 
         order by statechanged asc limit howmany;
create unique index on idtemp(documentid);

-- trim taskflag to the first N docs ordered by coref.
delete from taskflag where documentid not in (select documentid from idtemp) ;

当任务标志中有 120k 条记录而我保留 10k 条记录时，速度非常慢。

任务标志看起来像：

\d taskflag
                Table "public.taskflag"
    Column    |            Type             | Modifiers 
--------------+-----------------------------+-----------
 documentid   | character varying(64)       | not null
 taskid       | character varying(64)       | not null
 state        | smallint                    | 
 statechanged | timestamp without time zone | 
Indexes:
    "taskflag_pkey" PRIMARY KEY, btree (documentid, taskid)
    "task_index2" btree (documentid)
    "task_index4" btree (taskid, state, statechanged)

解释说：

                                QUERY PLAN                                    
----------------------------------------------------------------------------------
 Delete on taskflag  (cost=0.00..105811822.25 rows=223210 width=6)
   ->  Seq Scan on taskflag  (cost=0.00..105811822.25 rows=223210 width=6)
         Filter: (NOT (SubPlan 1))
         SubPlan 1
           ->  Materialize  (cost=0.00..449.00 rows=10000 width=146)
                 ->  Seq Scan on idtemp  (cost=0.00..184.00 rows=10000 width=146)
(6 rows)

我应该安排临时表来包含我保留的表吗？

Answer 1

最简单的优化可能是让规划器使用哈希反连接，将查询重写为：

 delete from taskflag where not exists
  (select 1 from idtemp where documentid=taskflag.documentid);

此外，您可能需要在填充临时表后立即分析它。