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I have the same table definition in two different databases on the same computer. When I explain a simple query in both of them, one database uses a sequence scan and the other uses an index scan. If I try to run the Seq Scan version without
the where clause restricting the value of uniqueid, it uses all of the memory on my computer and never completes.
How can I get the Seq Scan version to use an index scan? Explain results – good version: "GroupAggregate (cost=0.00..173.78 rows=1 width=15)" " -> Index Scan using pubcoop_ext_idx1 on pubcoop_ext (cost=0.00..173.77 rows=1 width=15)" " Index Cond: (uniqueid < '000000009'::bpchar)" Explain results – problem version: "HashAggregate (cost=13540397.84..13540398.51 rows=67 width=18)" " -> Seq Scan on pubcoop_ext (cost=0.00..13360259.50 rows=36027667 width=18)" " Filter: (uniqueid < '000000009'::bpchar)" Thanks, Ellen |
