Hello, I'm having two tables (listed):
CREATE TABLE "public"."device" ( "id" BIGSERIAL, "name" TEXT, "serialnumber" TEXT, -- many more columns -- ) WITH OIDS; CREATE UNIQUE INDEX "device_id_key" ON "public"."device" USING btree ("id"); CREATE INDEX "device_name_index" ON "public"."device" USING hash ("name"); CREATE TABLE "public"."tmeevent" ( "id" BIGSERIAL, "tme_endpointlabel" TEXT, "tme_ip_address" INET, "tme_gateway" TEXT, "tme_tmeserver_id" TEXT, "tme_action" TEXT, "tme_argument" TEXT, "tstamp" TIMESTAMP(6) WITHOUT TIME ZONE DEFAULT now(), "debug" BOOLEAN DEFAULT false, "tme_status" TEXT, CONSTRAINT "tmeevent_pkey" PRIMARY KEY("id") ) WITH OIDS; CREATE INDEX "tmeevent_tmeendpointlabel_index" ON "public"."tmeevent" USING hash ("tme_endpointlabel"); Table device contains 5285 rows, tmeevent contains 834912 rows. I have to make a query like the one below: SELECT device.id AS device_id, tme_endpointlabel, tme_ip_address, tme_gateway, tme_tmeserver_id, tme_action, tme_argument, tstamp, tme_status FROM (tmeevent LEFT JOIN device ON ((tmeevent.tme_endpointlabel = device.name))) Doing an explain analyze on this query gives me: Hash Join (cost=578.06..91208.59 rows=853428 width=167) (actual time=35.22..8992.61 rows=835013 loops=1) Hash Cond: ("outer".tme_endpointlabel = "inner".name) -> Seq Scan on tmeevent (cost=0.00..23606.12 rows=834912 width=138) (actual time=0.04..2193.97 rows=834912 loops=1) -> Hash (cost=564.85..564.85 rows=5285 width=29) (actual time=35.06..35.06 rows=0 loops=1) -> Seq Scan on device (cost=0.00..564.85 rows=5285 width=29) (actual time=0.04..25.07 rows=5285 loops=1) Total runtime: 9499.58 msec Why isn't the planner using my indexes? I tried making them as both rtree and btree, but that doesn't seem to work. I've been running VACUUM and ANALYZE on both tables, but it doesn't help. Thanks in advance! -- Thomas Braad Toft ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend