我有这个查询,它获取记录列表并跟踪每条记录的谱系,但它永远运行。谁能帮我提高性能?
WITH root_nodes AS
(SELECT distinct dlot.dim_lot_key AS lot_key, facility, lot
FROM pedwroot.dim_lot dlot
JOIN AT_LOT a
ON (a.at_lot = dlot.lot AND a.at_facility = dlot.facility)
WHERE (dlot.has_test_lpt = 'Y'
or dlot.has_post_test_lpt = 'Y') and a.at_facility = 'MLA'),
upstream_genealogy AS
(SELECT /*+ INDEX(fact_link_lot IX_R_FLLOT_DLOT_2)*/DISTINCT CONNECT_BY_ROOT
fllot.dst_lot_key AS root_lot_key,
fllot.src_lot_key
FROM pedwroot.fact_link_lot fllot
CONNECT BY NOCYCLE PRIOR fllot.src_lot_key = fllot.dst_lot_key
START WITH fllot.dst_lot_key IN (SELECT lot_key FROM root_nodes)),
at_lst AS
(Select *
FROM pedwroot.dim_lot dlot_lst
JOIN upstream_genealogy upgen
ON (upgen.src_lot_key = dlot_lst.dim_lot_key)
where dlot_lst.has_assembly_lpt = 'Y')
SELECT distinct dlot_root.lot AS AT_LOT,
dlot_root.facility AS AT_FACILITY,
dfac_root.common_name AS AT_SITE,
dlot_root.LTC AS AT_LTC,
al.lot AS AT_LST,
dlot_src.lot AS FAB_LOT,
dlot_src.facility AS FAB_FACILITY,
dfac_src.common_name AS FAB_SITE
FROM upstream_genealogy upgen
JOIN at_lst al
ON (upgen.root_lot_key = al.root_lot_key)
JOIN pedwroot.dim_lot dlot_src
ON (upgen.src_lot_key = dlot_src.dim_lot_key)
JOIN pedwroot.dim_lot dlot_root
ON (upgen.root_lot_key = dlot_root.dim_lot_key)
JOIN pedwroot.fact_lot flot
ON (dlot_root.dim_lot_key = flot.lot_key)
JOIN pedwroot.dim_facility dfac_root
ON (flot.facility_key = dfac_root.dim_facility_key)
JOIN pedwroot.dim_facility dfac_src
ON (flot.fab_facility_key = dfac_src.dim_facility_key)
WHERE dlot_src.has_fab_lpt = 'Y';
下面是这个查询的解释计划