Database Tuning tutorial (4) Explain performance analysis command, tuning explain

Database Tuning tutorial (4) Explain performance analysis command, tuning explain In the previous chapter, we learned how to find slow queries and record statements into logs. How can we know where statement problems occur after slow queries are

Database Tuning tutorial (1) preface & amp; definition of slow queries, Database Tuning tutorial Preface

Database optimization tutorial (I) preface & definition of slow query, and introduction of database optimization tutorial Preface   Recently, I helped the company optimize the database. Based on what I learned, I used the learning knowledge step by

Database Tuning tutorial (5) Roles of indexes and types of indexes, tuning Indexes

Database Tuning tutorial (5) Roles of indexes and types of indexes, tuning IndexesIii. Index In the previous chapter, we learned how to use explain to generate a query execution plan (QEP), so as to discover problems with the statement. Three

LeetCode Second Highest Salary, leetcodehighest

LeetCode Second Highest Salary, leetcodehighest Write a SQL query to get the second highest salary fromEmployeeTable. + ---- + -------- + | Id | Salary | + ---- + -------- + | 1 | 100 | 2 | 200 | 3 | 300 | + ---- + -------- + For example, given

[Translated from mos] Create synonym and mossynonym for table partition

[Translated from mos] Create synonym and mossynonym for table partition Reference: How to Create a Synonym on a Table Partition (Doc ID 119805.1)   How to Create a Synonym on a Table Partition:=============================================You cannot

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Postgresql auto-increment statement and Postgresql increment statement If it is simply starting from 1 and the incremental value is 1, you can write it like this. serail is a special type: Add Value and result to Employee: If you want to set

How to operate JGeometry object 2 and spatialjgeometry provided by Oracle Spatial in the back-end JSP file

How to operate JGeometry object 2 and spatialjgeometry provided by Oracle Spatial in the back-end JSP file I have written an article to record some of the problems I encountered. This time I updated my new host and encountered some problems. Now I

Log on to the mysql database at the command prompt.

Log on to the mysql database at the command prompt. Format: mysql-h server address-P server port number-u username-p C: \ Users \ Administrator> mysql-h localhost-P 3390-uroot-p (the-P before the port number is a capital letter) Enter password: *

Run scripts to transfer dynamic SQL statements and Report SQL statements.

Run scripts to transfer dynamic SQL statements and Report SQL statements. In most cases, the SQL statements of the report data source are fixed, but sometimes some of them need to be dynamically spelled out, for example, in a report application, you

LeetCode Rising Temperature, leetcode

LeetCode Rising Temperature, leetcode GivenWeatherTable, write a SQL query to find all dates 'IDs with higher temperature compared to its previous (yesterday's) dates. + --------- + ------------ + ---------------- + | Id (INT) | Date (DATE) |

Database Tuning tutorial (2) Prepare slow query data and optimize Databases

Database Tuning tutorial (2) Prepare slow query data and optimize Databases 1. Slow query found In the previous section, we talked about the definition of slow queries. This section describes how to create a large table and prepare data for slow

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Database Tuning tutorial (9) index TuningIii. Index 6. Several Common possibilities of indexing but not being used I talked about when to avoid using indexes, but sometimes I don't know how to use indexes. Below are several cases where indexes

LeetCode Customers Who Never Order, leetcodecustomers

LeetCode Customers Who Never Order, leetcodecustomers Suppose that a website contains two tables,MERsTable andOrdersTable. Write a SQL query to find all customers who never order anything. Table:MERs. + ---- + ------- + | Id | Name | + ---- + --

Database optimization tutorial (7) cost and cost of INDEX OPTIMIZATION

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Mongodb monogstat and mongodbmonogstat Environment Introduction:Monogdb 2.4.10Command Introduction: view the performance status of the active monogdb instance Main parameters:Execute unzip stat -- helpIn addition to command usage, a keyword field

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Quickly build a slave Database Based on mysqldump and mysqldump Mysql master-slave architecture is generally divided into three steps: one is to add the parameters required for replication to the master instance and the other is to create a snapshot

Database optimization tutorial (13) Other MySQL database Optimization Methods

Database optimization tutorial (13) Other MySQL database Optimization MethodsVi. Other MySQL database Optimization Methods In the last chapter, we will talk about some optimization methods not mentioned above. 1. My. ini configuration file Here

Database optimization tutorial (12) Optimize SQL statements and optimize SQL statements

Database optimization tutorial (12) Optimize SQL statements and optimize SQL statements5. Optimize SQL statements The previous chapter describes how to design a good table. A good table naturally requires a good SQL statement to operate on it. This

Database Tuning tutorial summary, Database Tuning Summary

Database Tuning tutorial summary, Database Tuning Summary Some time ago, I helped the company optimize the database. With my previous knowledge, I used the learning knowledge step by step in practice, and finally I got the speed up, it takes only

Database optimization tutorial (11) Design a beautiful table and database Optimization

Database optimization tutorial (11) Design a beautiful table and database Optimization4. Design a beautiful table The previous chapter describes how to use indexes to accelerate our query statements. This chapter allows us to go back to the initial

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