slow query - only uses indices - Mailing list pgsql-sql

Query and explain plan are below.  Seems like it spend the most time doing
Index Scan using i_tablea_atextfield on tablea ru  (cost=0.00..2265.28 rows=2 width=12) (actual time=0.624..881.313 rows=228 loops=1)

Any suggestions?

SELECT z.atextfield,    
       z.btextfield,    
       z.abigintfield,    
       p.achar255field, p.ptextfield,    
       z.achar1field,     u.aboolfield,    
       z.textfield1,    
       z.achar8field,    
       z.achar16field  
FROM tablea ru   
INNER JOIN tableb u ON ( u.atextfield = ru.anothertextfield )   
INNER JOIN tablec z ON u.atextfield = z.atextfield   
INNER JOIN tabled p ON p.id = z.pid   
LEFT JOIN tablee m ON u.atextfield = m.atextfield  AND m.boolcol5
WHERE ru.atextfield = 'thelookupval'  
  AND u.boolcol1 IS TRUE  
  AND u.boolcol2 IS FALSE  
  AND ru.achar1field <> 'N'  
  AND ru.boolcol3 IS FALSE  
  AND NOT EXISTS ( SELECT 'x' FROM tablea fru WHERE fru.atextfield = ru.anothertextfield AND fru.boolcol3 IS TRUE )
  AND EXISTS ( SELECT 'x' FROM tablef s WHERE s.atextfield = ru.atextfield AND s.boolcol4 IS TRUE )
  ORDER by ru.anothertextfield asc



Sort  (cost=2341.96..2341.97 rows=2 width=146) (actual time=1118.810..1119.098 rows=228 loops=1)
  Sort Key: ru.anothertextfield
  ->  Nested Loop Left Join  (cost=0.00..2341.95 rows=2 width=146) (actual time= 0.930..1117.258 rows=228 loops=1)
        ->  Nested Loop  (cost=0.00..2313.36 rows=2 width=131) (actual time=0.842..914.554 rows=228 loops=1)
              ->  Nested Loop  (cost=0.00..2296.65 rows=2 width=93) (actual time= 0.765..901.916 rows=228 loops=1)
                    ->  Nested Loop  (cost=0.00..2281.98 rows=2 width=72) (actual time=0.690..893.648 rows=228 loops=1)
                          ->  Index Scan using i_tablea_atextfield on tablea ru  (cost= 0.00..2265.28 rows=2 width=12) (actual time=0.624..881.313 rows=228 loops=1)
                                Index Cond: (atextfield = 'thelookupval'::text)
                                Filter: ((achar1field <> 'N'::bpchar) AND (boolcol3 IS FALSE) AND (NOT (subplan)) AND (subplan))
                                SubPlan
                                  ->  Index Scan using tablef_pkey on tablef s  (cost=0.00..8.34 rows=1 width=0) (actual time=0.016..0.016 rows=1 loops=228)
                                        Index Cond: (atextfield = $1)
                                        Filter: (boolcol4 IS TRUE)
                                  ->  Bitmap Heap Scan on tablea fru  (cost=4.61..90.41 rows=1 width=0) (actual time=3.590..3.590 rows=0 loops=243)
                                        Recheck Cond: (atextfield = $0)
                                        Filter: (boolcol3 IS TRUE)
                                        ->  Bitmap Index Scan on i_tablea_atextfield  (cost= 0.00..4.61 rows=22 width=0) (actual time=0.044..0.044 rows=17 loops=243)
                                              Index Cond: (atextfield = $0)
                          ->  Index Scan using tablec_pkey on tablec z  (cost= 0.00..8.34 rows=1 width=60) (actual time=0.047..0.049 rows=1 loops=228)
                                Index Cond: (z.atextfield = ru.anothertextfield)
                    ->  Index Scan using tabled_pkey on tabled p  (cost= 0.00..7.32 rows=1 width=29) (actual time=0.030..0.031 rows=1 loops=228)
                          Index Cond: (p.id = z.pid)
              ->  Index Scan using tableb_pkey on tableb u  (cost= 0.00..8.34 rows=1 width=38) (actual time=0.049..0.051 rows=1 loops=228)
                    Index Cond: (u.atextfield = ru.anothertextfield)
                    Filter: ((boolcol1 IS TRUE) AND (boolcol2" IS FALSE))"
        ->  Index Scan using tablee_atextfield_idx on tablee m  (cost=0.00..14.28 rows=1 width=39) (actual time=0.883..0.883 rows=0 loops=228)
              Index Cond: (u.atextfield = m.atextfield)