sql performance tuning techniques

The following environments are representative of the general configuration and work environment of small and medium-sized enterprises. I hope this article will help you understand the MySQL database performance tuning method in Linux. 51CTO recommends the MySQL database getting started and proficient tutorial to you. Hardware preparation environment: Hard Drive: 16 SAS15KRAID5 with 512 MCacheCPU: Two AMD4 C

An outline that is roughly written in the optimization content of the physical design and logical design of the DB, mainly physical design, logical design introduction of the content is not much, the outline of the physical structure design and example optimization of organic combination of the logical structure design and application adjustment together ... Oracle Performance Tuning Guidance outline Desi

operation This is it, the next we add to SQL Server on the use of the index and dynamic index content, About indexes I believe that many people who understand database products are familiar with it, but the way in which some statements in SQL Server take advantage of the index may not be clear, our next analysis of this piece, to understand the indexing method and optimization

, such as business logic, SQL optimization, algorithms and so onIn this example, the Linux kernel parameter adjustment, the network has more detailed parameters, please refer to:11 1In this test, the adjustment of the relevant one-piece is as follows:1, Resin to handle the adjustment of the service:Conf\resin.xml file parameter adjustment under Resin directoryfree-min>10m free -min>Specific adjustment methods, you can refer to the JVM

the CPU, memory, and disk drive used by the database server. The second is to optimize the queries sent to the database. This article discusses hardware-side performance tuning. Query optimizations can be done through SQL commands such as CREATE INDEX, vacuum, vacuum full, ANALYZE, CLUSTER, and EXPLAIN. These are discussed in "Postgresql:introduction and Concept

System Performance Tuning for CentOS servers Linux is an open-source operating system that supports various hardware platforms. Linux servers are world-renowned. The main difference between Linux and Windows is that, by default, a Linux server does not provide a GUI (graphical user interface) but a command line interface. The main purpose of the GUI is to efficiently process non-interactive processes. The r

Some small aspects of database Performance tuning:1. 1 Performance IndexDatabase performance is generally measured in two metrics: response time and throughput. The faster the response, the greater the throughput and the better the database performance. Response time and thr

There are fewer tutorials on iOS performance tuning, and the decision to write an iOS performance Tuning series focuses on several aspects of memory leaks, performance optimization, traffic, and power analysis.Xcode has provided a very powerful

' 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

familiar with design methods, design patterns, basic performance components and common optimization ideas. Code Tuning-micro-tuning, focusing on performance differences in implementation JVM tuning-the memory of a late development requires a certain understandin

didn't consider performance. It is recommended that you do not place anything except the DB2 catalog and Directory into BP0. 3. DSNDB07 is 100% ordered Actually: DSNDB07 is never in the 100% order, because there is a random activity on the page in the working file. The activity may be as high as 45%, but usually ranges from 3% to 10%. 4. VARCHAR should always be placed at the end of the row Actually: This is always a problem. If the table is always r

. Create_snapshot; We can also use the Dbms_workload_repository package to complete the baseline, the default settings and other operations.ADDM (Automatic Database diagnostic Monitor AWR)Oracle is an internal consulting system, can automatically complete the most database of some optimization recommendations, giveSQLThe optimization, the creation of the index, the collection of statistics and other suggestions.ADDM report Generation:Sqlplus>@?/rdbms/addmrpt.sqlThe most important part of Oracle

are not frequently join. Otherwise less efficient. 3 Tuning for SQL ---Avoid full fuzzy query%like%, it will invalidate the index. ---Avoid using SQL functions directly in SQL, SQL functions invalidate cached queries and replace them with variables. ---Large-volume operatio

are some bugs, is not necessarily applicable to the core of the online system.3. DRBD Disk Network mirroring schemeAdvantage: Software is powerful, data is mirrored across physical hosts at the underlying fast device level, and different levels of synchronization can be configured according to performance and reliability requirements. IO operations are kept in order to meet the database's demanding data consistency.Disadvantage: Non-Distributed File

Alarm problem:Too many processes onZabbix Poller processes more than 75% busyZabbix unreachable Poller processes more than 75% busy1. The device that collects the data through the Zabbix agent is in the moniting state but at this time the machine freezes or other causes the Zabbix agent to die the server obtains the data, at this time unreachable pollerWill rise.2. The device that collects the data through the Zabbix agent is in the moniting state, but the server gets the data from the agent too

deployment of one serverØ Deploy multiple Web serversØweb Load Balancing-f5Ø data read/write separationØ Synchronous/asynchronous computation between various applications using Message QueuingØ Select the appropriate communication mode between applications, communication protocolØweb distributed, distributed application, distributed dataØ distributed nodes using high-performance servers, small fleet, supplemented by high-speed network bandwidth, etc.

actually a CDN.Avoid CSS expressions.Put JS and CSS on the outside...............None of the above three have been tested or practiced. are seen in the book, after the first 4 optimizations, the page loading speed has reached my expectations, and then prepare the code to review the rectification code. The front performance tuning has always felt the optimization of Java code, optimized

Label:For the full stack, database skills are indispensable, relational databases or NoSQL, memory-based database or partial disk storage database, object storage database or graph database ... , but the first essential skill should be MySQL. From the rise of lamp, to the advent of mariadb, and even the advent of PG, skilled MySQL skills are very useful. MySQL database technology is also a lot of aspects, here is only the necessary performance

not be used as a shortcut for editing validity. This is usually something else, but should be used in real parent-child relationship. 8. A table can contain at most one or two indexes. Actually: tables should have multiple indexes according to DB2 Performance Tuning requirements. 9. Non-partitioned indexes (NPI) should not be used, especially in large tables. Actually: this is related to countless prob

Label:Original: SQL Server Tuning series play Turn II (how to run with the aggregation joint hint (Hint) bootstrap statement)ObjectiveIn the previous article, we analyzed the usage of query hint as the first of the last play module of tuning series. Interested can click to view: SQL Server