mysql クエリが「データ送信中」の状態でスタックする問題があり、12 ~ 20 分以上かかることがあります。その後、接続が切れてサイトがダウンするまで、他のクエリがその背後に積み重なっているのが見えます。 . 最終的には終了するようですが、座って十分に長く見ていると、「一時テーブルの削除」に進み、クリアします。
今、私はこのコードを書いていませんが、それを修正する任務を負っています。私は会社の IT とサーバー管理を担当していますが、サイトの実際のコーディングはすべて開発者に任せています。私は mysql についてほとんど何も知りませんが、私の Web 担当者が使用している SELECT クエリは怪しいように見えます。私がそれを正しく読んでいれば、彼は「すべてのテーブルでproduct_id xxxxを探して、それらの結果を出して、残りを破棄してください」と言っています.
mysql コンソールからクエリを実行すると、結果が返されるまでに 3 ~ 20 秒かかり、PHP が実際に呼び出すと、明らかに時間がかかります。1 つの製品 ID に限定されないことに注意してください。私が呼ぼうとしている製品に大きな違いはないようです。
これは、mysql.logに表示されるものです
47384 Connect ecom_a@localhost on
47384 Init DB ecom_Products
47384 Query SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = 'ecom_Products'
47384 Query
SELECT * FROM ((SELECT * FROM `AC_Electric_Motor_Run_Capacitors`)
UNION ALL (SELECT * FROM `AC_Electric_Motor_Start_Capacitors`)
UNION ALL (SELECT * FROM `AC_Filters`)
UNION ALL (SELECT * FROM `AC_Gear_Motors`)
UNION ALL (SELECT * FROM `AC_Line_&_Load_Reactors`)
UNION ALL (SELECT * FROM `AC_Voltage_Regulators`)
UNION ALL (SELECT * FROM `Auxiliary_Contact_Blocks`) UNION ALL (SELECT * FROM `Bleed_Down_Resistors`) UNION ALL (SELECT * FROM `Coils`) UNION ALL (SELECT * FROM `Contactors`) UNION ALL (SELECT * FROM `Crimpers`) UNION ALL (SELECT * FROM `DC_Gear_Motors`) UNION ALL (SELECT * FROM `Diesel_Engines`) UNION ALL (SELECT * FROM `Disconnects`) UNION ALL (SELECT * FROM `Electric_Motor_Slide_Bases`) UNION ALL (SELECT * FROM `Electric_Motors`) UNION ALL (SELECT * FROM `Electric_Powered_Water_Pumps`) UNION ALL (SELECT * FROM `Electrical_Enclosures`) UNION ALL (SELECT * FROM `Engine_Powered_Water_Pumps`) UNION ALL (SELECT * FROM `External_Control_Interfaces`) UNION ALL (SELECT * FROM `Float_Switches`) UNION ALL (SELECT * FROM `Foot_Switches`) UNION ALL (SELECT * FROM `Generator_Heads`) UNION ALL (SELECT * FROM `Horizontal_Shaft_Gas_Engines`) UNION ALL (SELECT * FROM `Insulating_Resins`) UNION ALL (SELECT * FROM `Limit_Switches`) UNION ALL (SELECT * FROM `Magnet_Wire`) UNION ALL (SELECT * FROM `Manual_Transfer_Switches`) UNION ALL (SELECT * FROM `Mechanical_Interlock_Blocks`) UNION ALL (SELECT * FROM `Medium_Voltage_Transformers`) UNION ALL (SELECT * FROM `Motor_Starters`) UNION ALL (SELECT * FROM `Multi-fuel_Engines`) UNION ALL (SELECT * FROM `Overload_Relays`) UNION ALL (SELECT * FROM `PTO_Generator_3-Point_Hitch_Mounts`) UNION ALL (SELECT * FROM `PTO_Generator_Drive_Adapters`) UNION ALL (SELECT * FROM `PTO_Generator_Drive_Shafts`) UNION ALL (SELECT * FROM `PTO_Generator_Trailers`) UNION ALL (SELECT * FROM `PTO_Generators`) UNION ALL (SELECT * FROM `Packaged_Standby_Generators`) UNION ALL (SELECT * FROM `Portable_Generator_Covers`) UNION ALL (SELECT * FROM `Portable_Generator_Lifting_Provisions`) UNION ALL (SELECT * FROM `Portable_Generator_Wheel_Kits`) UNION ALL (SELECT * FROM `Portable_Generators`) UNION ALL (SELECT * FROM `Resilient_Vibration_Isolators`) UNION ALL (SELECT * FROM `Resistance_Wire`) UNION ALL (SELECT * FROM `Rotary_Frequency_Converters`) UNION ALL (SELECT * FROM `Rotary_Phase_Converters`) UNION ALL (SELECT * FROM `SO_Cable`) UNION ALL (SELECT * FROM `Single_Phase_Motors_with_Base_Mount`) UNION ALL (SELECT * FROM `Single_Phase_Motors_with_Face_&_Base_Mount`) UNION ALL (SELECT * FROM `Single_Phase_Motors_with_Face_Mount`) UNION ALL (SELECT * FROM `Soft_Starters`) UNION ALL (SELECT * FROM `Special_Metal_Wire`) UNION ALL (SELECT * FROM `Static_Frequency_Converters`) UNION ALL (SELECT * FROM `Static_Phase_Converters`) UNION ALL (SELECT * FROM `Surge_Suppressors`) UNION ALL (SELECT * FROM `Three_Phase_Motors_with_Base_Mount`) UNION ALL (SELECT * FROM `Three_Phase_Motors_with_Face_&_Base_Mount`) UNION ALL (SELECT * FROM `Three_Phase_Motors_with_Face_Mount`) UNION ALL (SELECT * FROM `Transformers_-_General`) UNION ALL (SELECT * FROM `Variable_Frequency_Drives`) UNION ALL (SELECT * FROM `Variable_Transformers`) UNION ALL (SELECT * FROM `Vehicle_&_Equipment_Batteries`) UNION ALL (SELECT * FROM `Vertical_Shaft_Gas_Engines`) UNION ALL (SELECT * FROM `Welding_Cable`) UNION ALL (SELECT * FROM `_Default`))
AS t WHERE product_ID = 'LF0009' LIMIT 1