why use queries in database

I. Benefits of using indexesCreating an index can greatly improve the performance of your system. First, by creating a unique index, you can guarantee the uniqueness of each row of data in a database table. Second, it can greatly speed up the

Atitit Cache Caching Path Attilax Etti Summary 1. Purpose of using caching (using cache) 1 1.1.1. Reduce the burden on the database by achieving the target 1 1.2. Speed up the query 2 2. Common parameter expiration time of the cache (seconds 2 3.

When the performance of SQL Server becomes worse, the following two things are most likely to occur: First, some queries produce a lot of pressure on system resources. These queries affect the performance of the entire system because the

Original: Using SQL Profiler to handle expensive queriesWhen the performance of SQL Server becomes worse, the following two things are most likely to occur: First, some queries produce a lot of pressure on system resources. These queries

1, no index or no index (this is the most common problem of slow query, is the defect of program design)2, I/O throughput is small, forming a bottleneck effect.3. No computed columns are created, resulting in queries not being optimized.4.

This article describes how to use memcached in Python to reduce the number of database queries. memcached is a distributed memory cache tool that can reduce the number of hard disk I/O operations, for more information about how to optimize the

This article will discuss the similarities and differences between simple nested queries and non-nested queries in SQL, through which you can better understand SQL statements. One day's work was to fix the bug of a project, and then we found that

  was asked a question yesterday by a Daniel, why SQL Parameterized query can prevent SQL injection, what is the principle of parameterized query? Results stuffy force, before only know the parameterized query is to prevent SQL injection, but did

Optimization of queries with any combination of multiple fields with high concurrency and low base. Optimization of highly concurrent and low-base multi-field queries with any combination 1. the problem first explains what the low-base multi-field

This article was reproduced from the blog http://www.cnblogs.com/lyhabc/archive/2013/06/10/3130856.html of the BirchQueries on SQL Server database transaction logsI can't touch SQL Server.Experimental environment: SQLSERVER2005 SP4,WINDOWS7I was not