sql query tuning tips

MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques

Label:MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techn

use of load on the server, sometimes a simple query can affect other queries. 85. When the load increases on your server, use show processlist to view slow and problematic queries. 86. All suspicious queries that are tested in the mirrored data generated in the development environment. MySQL backup process:87. Back up from a level two replication server. 88. Stop replication during a backup to avoid inconsistencies in data dependencies and foreign ke

Label: MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization tech

Client protocols Aliases The Protocol is the same as (2). You can specify more configurations. 3. sp_configure/reconfigure Displays or changes the global configuration settings of the current server. Many configurations need to be set through sp_configure. Syntax: sp_configure [ [ @configname = ] 'option_name' [ , [ @configvalue = ] 'value' ] ] reconfigure For example: To configure advanced options with sp_configure, you must first run sp_configure when the "show advanced options" op

in SSMS T-SQL Tools SQL Profiler Query Analyzer Database Engine Tuning Advisor Windows Event Viewer, primarily to view the following event logs Windows Application Log Windows system logs Windows security Log Windows System Monitor is able to track:

. server.2005. Technical Insider "series ConclusionThis article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How server uses parallel operations to maximize the use of existing hardwar

The following articles mainly describe the ultimate SQL Performance tuning Technology of DB2, including the impact of pointers on the Performance of DB2 databases, DB2 performance tuning technology and a detailed description of more future tuning technologies, the following is the main content of the article. DB2,

Tags: url inpu Good application response from is the parallel Operation database systemObjective In the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used operator optimization techniques, the same emphasis on the master of basic knowledge. In this article, we can understand how

' Using XML, JSON, or plist Using Nscoding Archive Using a local SQL database similar to SQLite Using Core Data What is the problem with Nsuserdefaults? Although it is very nice and convenient, but it only applies to small data, such as some simple Boolean settings options, and then you need to consider other waysWhat about this structured file of XML? Overall, you need to read the entire file into memory to parse it, which is ve

Original addressMySQL is a powerful open source relational database management system (RDBMS). It was posted on 1995 (20 ago). It uses Structured Query Language (SQL), which may be the most popular choice in database content management. The latest MySQL version is 5.6.25, released on May 29, 2015.An interesting fact about MySQL is that its name comes from the daughter "My" of Michael Widenius (the founder o

Performance Tuning is not a simple task. There is no omnipotent solution at all, but you can use some basic principles to implement it. In general, performance tuning is the role of DBA. however, DBA does not have time to carefully check every change made to the stored procedure. so learning some basic tuning may help you save the effort of rewriting.CodeTime.I

SQL Server Performance Tuning 3 (Index) MaintenanceHeat1 reviews Brook Stream GrassSQL Server Performance Tuning 3 (Index) MaintenanceObjectiveThe previous article describes how to improve the query performance of a database by building an index, which is really just the beginning. Subsequent to the lack of proper mai

queries, the data needs to be re-distributed at each node, subject to network transport, disk I/O, and the redistribution rate is slow. Association key coercion Type conversionIn general, the table follows the assigned distribution key as a hash division. If two tables are distributed by Id:intege, ID:NUMERICR, and associated, a table ID is required for forced type conversions because different types of hash values are not the same, resulting in data redistribution. Association key

on its basis to modify the template saved to its own.1. Create a TSQL statement trace2. Create a tracking templateTo stop the current TSQL trace, choose File-Save as tracking template to save as your own tracking template.3. Column filteringCurrently the TSQL statement that filters the trace contains book, where the column filter is similar to the syntax of the where like.When you reshape a column, you don't need a blur condition:Note: If you want to remove a column filter, remember to delete t

Use Cases I remember when I was tuning for a company, the person in charge sent me a bunch of business T-SQL scripts, I am still calm in the face of massive scripts, although I do not understand the internal complex business, however, we have to focus on the key "slowness" of the problem. We will filter them out based on the "slowness" of the query and optimize t

easily believe that the online spread of those "SQL optimization gold sentence", "SQL Optimization prescriptions", their practice several times, is the hard truth. First figure out the goal of performance tuning From the most intuitive, most common point of view, mainly includes the following two points: Optimize response time What is "Optimizing response time"

How to use STA (SQL tuning advisor), tuningadvisor1. manually generate SQL tuning advisor1. SQL text format:DECLAREMy_task_name VARCHAR2 (30 );My_sqltext CLOB;BEGINMy_sqltext: = 'select * FROM DBA_SEGMENTS where owner = ''clic' AND SEGMENT_TYPE = ''table ''';My_task_name: =

Speaking of the tuning of SQL Server, I think everyone would like to know this knowledge. I am also exploring the way, we have any good ideas, welcome to discuss and study. Win the people's long, can avoid weaknesses. This article is mainly from the programmer's SQL code, if you want to read, you can download the Internet to read (of course, the best way to buy

. server.2005. Technical Insider "series Conclusion This article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How server uses parallel operations to maximize the use of existing hardw