On Tue, Aug 7, 2018 at 12:05 AM Ken Tanzer <ken.tanzer@xxxxxxxxx> wrote:
I'm definitely not understanding why or how auto-explain would help here. (Also, don't overlook the fact that both si_stable and si_imm have the exact same definition (except for stable v. immutable), and are calling the same function (staff_inspector_stable)). I can load up the auto_explain stuff if it really will help, but in the meantime what I did was pull the query out of staff_inspector_stable, and inserted into the "SELECT client_id,staff_inspector( ... ) FROM tbl_residence_own" query, replacing the "client" (parameter 1) with the client_id from the tbl_residence_own, and replacing "asof" (parameter 2) with target_date(), which seems like it should closely mimic the original query.I ended up with the query below, and have attached the explain output to this email. The actual timing is:Planning time: 2.737 ms Execution time: 821.034 msWhich is somewhat better than the function versions, though it seems unsurprisingly and not dramatically so.EXPLAIN (VERBOSE,ANALYZE,BUFFERS) SELECT client_id, CASE WHEN (SELECT program_type_code FROM reg_spc WHERE target_date() BETWEEN reg_spc_date AND COALESCE(reg_spc_date_end,target_date()) AND client_id=tro.client_id LIMIT 1) ILIKE 'SSP%' THEN COALESCE((SELECT staff_id FROM staff_employment_current WHERE staff_position_code='COORD_PROP' AND agency_project_code='SSP' LIMIT 1),(SELECT staff_id FROM staff_employment_current WHERE staff_position_code='MGRPROJ' AND agency_project_code='SSP' LIMIT 1)) ELSE (SELECT staff_inspector FROM tbl_residence_own ro LEFT JOIN l_housing_project USING (housing_project_code) WHERE client_id=5538 AND target_date() BETWEEN residence_date AND COALESCE(residence_date_end,target_date()) AND NOT ro.is_deleted LIMIT 1) END FROM tbl_residence_own tro;
Whoops, scratch that previous explain and query. I accidentally left in a hard-coded client_id from earlier testing. The correct query is:
EXPLAIN (VERBOSE,ANALYZE,BUFFERS) SELECT client_id,
CASE WHEN
(SELECT program_type_code FROM reg_spc WHERE target_date() BETWEEN reg_spc_date AND COALESCE(reg_spc_date_end,target_date()) AND client_id=tro.client_id LIMIT 1)
ILIKE 'SSP%' THEN
COALESCE((SELECT staff_id FROM staff_employment_current WHERE staff_position_code='COORD_PROP' AND agency_project_code='SSP' LIMIT 1),(SELECT staff_id FROM staff_employment_current WHERE staff_position_code='MGRPROJ' AND agency_project_code='SSP' LIMIT 1))
ELSE
(SELECT staff_inspector FROM tbl_residence_own ro LEFT JOIN l_housing_project USING (housing_project_code) WHERE client_id=tro.client_id AND target_date() BETWEEN residence_date AND COALESCE(residence_date_end,target_date()) AND NOT ro.is_deleted LIMIT 1)
END
FROM tbl_residence_own tro;The corrected explain output is attached, and the actual timing was:
Planning time: 2.741 ms
Execution time: 2538.277 ms
Sorry for the confusion! It's been a long day, and filled with many 20+ second waits for queries to finish. :)
Cheers,
Ken
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Attachment:
explain.staff_inspector_query_corrected.sql
Description: Binary data
