SQL - оптимизация запроса Mysql
5 USDПытаюсь понять, как оптимизировать время выполнения важного для меня запроса.
Возможно, здесь есть специалист, который мне в этом поможет, я отблагодарю.
К сожалению, SQL фрилансхант воспринимает как контактные данные и не дает опубликовать код, пришлось прикрепить скриншотом 😔
P.S. Добавил текстовый SQL в обсуждениях к проекту.
Проблема во времени исполнения запроса:
**Run Time: 4.206827**
Select Type Table Type Possible Keys Key Key Len Ref Rows Extra
SIMPLE ws_manager_repl_log ALL 415 Using where; Using temporary; Using filesort
SIMPLE kst_cs_shopping ALL 45831 Using where; Using join buffer (flat, BNL join)Screen 1: https://i.imgur.com/wF0du28.png
Screen 2: Explain: https://i.imgur.com/4lOhyso.png
Screen3: Profiling: https://i.imgur.com/cU2SPgI.png
Screen4: Index def: https://i.imgur.com/UAfioBF.png
-
SELECT ws_manager_repl_log.*, kst_cs_shopping.thread_id, kst_cs_shopping.stage, kst_cs_shopping.user_id FROM ws_manager_repl_log LEFT JOIN kst_cs_shopping ON ws_manager_repl_log.thread_id = kst_cs_shopping.thread_id WHERE kst_cs_shopping.stage != 'shoping' AND ws_manager_repl_log.updated_at <= 1599982332 AND ws_manager_repl_log.mark_as_removed IS NULL ORDER BY ws_manager_repl_log.updated_at DESC LIMIT 15 OFFSET 15 -
Уточните, пожалуйста:
1. тип СУБД и её версию
2. хотя бы примерное количество записей в обеих таблицах. -
MYSQL, 50-60 тысяч записей. Всё на скриншотах есть.
-
Current freelance projects in the category Databases & SQL
Accounting, planning, and sales system for a mushroom farm
600 USD
Here is the complete, final text of the Technical Assignment (TA). It combines all your requirements: 16 chambers, 20 contractors, a schedule by days, accounting for containers, profitability calculation, and a mandatory division into three grades of mushrooms. You can fully… Databases & SQL, Client Management & CRM ∙ 1 day 7 hours back ∙ 51 proposals |
External report 1C 8.3 — forecast of goods balances
22 USD
An external report (.erf) is needed for 1C:Enterprise 8.3 (configuration to be specified). What it should do: Extract product balances from the database Analyze sales history for the last 30 days Calculate the average sales rate for each product Determine how many days until the… Databases & SQL, Client Management & CRM ∙ 1 day 7 hours back ∙ 11 proposals |
Web Application & Database Security Audit for Custom CRM — BaaS / Database-as-API Specialist (Penetr
Project Overview We operate a custom-built customer relationship management (CRM) platform that runs two service businesses on a single system. It is a modern JavaScript web application backed by a backend-as-a-service (BaaS) database and deployed on a serverless hosting… Databases & SQL, Testing & QA ∙ 1 day 20 hours back ∙ 9 proposals |
Database synchronization
Synchronization of Microsoft Access programs and CRM SalesDrive. Data transfer from CRM to Microsoft Access in the first stage (changing the funnel status). Data transfer from Microsoft Access to CRM in the second stage (changing the status in the program). Databases & SQL ∙ 2 days 2 hours back ∙ 11 proposals |
Setting up a backup system and optimizing server infrastructure
Objective of the work: Ensure reliable data storage for the CRM system and application by implementing an automated backup system, as well as carry out a series of server improvements to enhance the stability, security, and performance of the infrastructure. DevOps, Databases & SQL ∙ 3 days back ∙ 24 proposals |
Riga