Ingantawa da hankali yana farawa da binciken shirin aiwatarwa (EXPLAIN) don nemo matsananciyar matsala, sannan sai a yi aiki da kyau - mafi yawa ƙara indexes, sake rubutar tambayo, da guje wa jiya. Babbar nasara shine yawanci juya full table scans zuwa index lookups.
EXPLAIN ANALYZE
orders customer_id ;
EXPLAIN (ko EXPLAIN ANALYZE) yana nuna yadda jiyya take aiwatar da tambayo — muhimmin abu, ko yana yin full table scan (a hankali) ko yana amfani da index (sannu). Koyaushe yi profile kafin ingantawa.
-- if EXPLAIN shows a Seq Scan on a filtered/joined column → add an index
CREATE INDEX idx_orders_customer ON orders(customer_id);
-- turns a full scan into a fast index lookup
Mafi yawon aiki na tasiri: ƙara indexes akan cholɓen da aka yi amfani su a WHERE, JOIN, da ORDER BY. Wannan yana juya full table scans zuwa saurin leɓunanko.
-- ❌ functions on a column prevent index use
WHERE UPPER(email) = '[email protected]' -- can't use an index on email
WHERE email = '[email protected]' -- ✅ can use the index
-- ❌ leading wildcard LIKE can't use an index
WHERE name LIKE '%smith' -- ✅ 'smith%' (prefix) can use an index
-- ❌ SELECT * fetches unneeded columns
SELECT * → SELECT only_needed_columns -- less data, may use a covering index
-- ❌ N+1 queries (querying in a loop) → use a single JOIN instead
✓ Fix N+1 queries (one query per row) → use JOINs / batch into one query
✓ Add appropriate indexes (including COMPOSITE for multi-column filters)
✓ Reduce data scanned — filter early, select only needed columns, paginate
✓ Rewrite subqueries as JOINs where more efficient
✓ Use EXISTS instead of IN for existence checks on large subqueries
✓ Keep statistics updated (ANALYZE) so the planner makes good choices
✓ Consider denormalization / materialized views for expensive repeated queries
✓ Watch for missing indexes on FOREIGN KEYS (joins scan without them)
Ingantawa ta tambayo ilimi ne mai mahimmanci don aiwatarwa na jiyya — jiyya masu hankali su ne babbar dalili na marasa kyau na aiki na aikace-aikace, kuma fahimta yadda za a nemo da gyara su ne muhimmin ƙwararraki ga mutanen da ke yin aiki da jiyya a girma.
Ilimin mahimmanci shine bincike da EXPLAIN (duba shirin aiwatarwa don nemo ainihin matsananciyar matsala — muhimmin abu ko tambayo yana yin hankali full table scan ko saurin index lookup) kafin ingantawa, maimakon hasashen — wannan hanyar ma'auni ita ce gida ta ingantawa ta aiki.
Mabambacin babbar ƙarfe da mafi yawon nasara shine ƙara indexes akan gindin, haɗun da nuni da kama jeri na gindin (juya full table scans zuwa saurin leɓunanko — mafi yawon lokacin yana inganta lokacin tambayo da rahunkali mai girma), na yin ilimin index a tsakiya na ingantawa.
Fahimta jiya na gida ita ce mai mahimmanci kamar yadda: aiki akan cholɓen da faskari da farawa LIKE suna hana amfani da index, SELECT * yana kawo da bayanan da ba sa bukate, kuma musamman N+1 tambayo (tambayar yin aiki a madawwaki maimakon haɗun gida guda — aiki na gida na tsayi na aiki mara aiki) — gane da gyara waɗannan yana magancin mafi yawon dalilan jiyya masu hankali.
Wasu fasahohin (composite indexes, ragewa data da aka leɓa, sake rubutar tambayo na gida azaman JOINs, jiya bayanan hazoowa, nuni na gabatarwa don jiyya da tsada) suna kammala kayan aiki.
Tun da aiwatarwa ta tambayo yana shafar saurin jiyya da girma, kuma tun da tsarin hanyar (bincike da EXPLAIN, sannan gyara — mafi yawon lokacin ta ƙara indexes da rasa jiya na gida kamar N+1) shine gida ta jiyya da sauri ƙarƙashin nauyi, gwaja ingantawa ta tambayo ita ce ilimi mai mahimmanci, girma, da saraka da ke gida — ilimi mai girma, sashen mahimmanci da ba a sakaci, ba a kabara a rikittattu na jiyya don aiwatarwa.
Ɗakin karatu na tambayoyin hira na IT tare da amsoshi cikakke — daga Junior zuwa Senior.
Ba da Gudummawa