postgresql tuning

Today, developers continue to develop and deploy applications that use lamp (linux®, Apache, MySQL, and Php/perl) architectures. However, server administrators often have little control over the application itself, because the application is written by someone else. This article focuses on tuning the database layer to achieve maximum efficiency. About MySQL Tuning There are 3 ways to speed up the running

A basic knowledge 1.1 What is the performance Before performance tuning, let's first look at what performance is. As for performance, I think everyone who has studied Java can list a few points or even talk about it. In the book "Java TM Platform Performance", the following five aspects are defined as criteria for evaluating performance: 1 performance of the operation-which algorithm is the best performing performance? 2 memory allocation-How much

How to use Oracle's Dbms_sqltune package to execute SQL Tuning Advisor for SQL self-tuning1 ". Here is a simple example to illustrate the use of Dbms_sqltuneStart by running a SQL that you want to tune, and then get the SqlidSql> SELECT * from V$sqltext where sql_text like ' select * from dual% ';ADDRESS hash_value sql_id command_type PIECE sql_text---------------- ---------- ------------- ------------ ---------- --------------------------------------

In-depth interpretation of sequences in PostgreSQL and their related functions, and interpretation of postgresql I. Introduction A sequence object (also called a SEQUENCE generator) is a special single-row table created using create sequence. A sequence object is usually used to generate a unique identifier for a row or table. Ii. Create a sequence Method 1: Specify the field type as serial directly in the

JVM tuning is primarily for heap memory, where heap memory is divided into: new, old, and permanent areasThe permanent zone stores the interface and class metadata of the system JDK itself, so only the new and old-age areas have optimized space.New District: Eden Area and survivor area. All the classes were new in the Eden District, and the survivor Zone was divided into 0 and 1 districts. When the space in the Eden area is exhausted,Garbage Collectio

Tags: ATI latest sel Opening technical file reference tis onlineNow has been doing the project, the amount of data is relatively small, at the beginning of the time did not feel, because it is just beginning, the amount of data is very small, in the process of the use of speed is very fast, but with the constant growth of data volume, found that the program is more and more slow, even the problem of timeouts, so to the program Early project is relatively tight, not for the Big Data volume busine

Label:Objective About SQL Server Tuning series is a huge content system, not a word two words can be analyzed clearly, this article first in the SQL tuning in the most commonly used query plan to parse, to do a good job of the basic grasp, tamping basic skills! Then we talk about the overall statement tuning. Learn how to read and understand query plans, and enum

PostgreSQL tutorial (5): Functions and operators (1), postgresql Operators I. logical operators: Common logical operators include AND, OR, and not. Its semantics is exactly the same as that of logical operators in other programming languages. Ii. Comparison operators: The following is a list of comparison operators provided by PostgreSQL: The comparison operator

: There are various types of xlog records (for example, Heap,btree,clog,storage,gin, and Standby records, just to name a few).Xlog Records Backward links. This way, each entry points to the previous entry in the file. In this way, we can fully believe that we have found the end of the record as long as we want to point to the pointer to the previous entry.make XLOG with certaintyAs you can see, a change could trigger many xlog entries. This is true for all kinds of statements, such as a large DE

Common tuning methods in linux and common tuning methods in linux Performance Tuning is one of the most important tasks for O M engineers. If your production environment experiences slow system response speed, abnormal hard disk I/O throughput, and the data processing speed is lower than the expected value, or if the CPU, memory, hard disk, network, and other sy

. Net Performance Tuning Series Article Index of series articles . Net Performance Tuning: Use of ants performance profiler . NET performance optimization 2: Use Visual Studio for code measurement . Net Performance Tuning 3: tuning tools and methods for yslow-related rules 1. Introduction to yslow

Manual PostgreSQL database initialization tutorial in windows, initialize postgresql Environment: win7 64 sp1PG: 9.3.5 1. Create the postgres user, and the password is also postgres: net user postgres postgres /add 2. Create a data directory under the root directory of the database: C:\Program Files\PostgreSQL\9.3>md data 3. Remove the administrator permission on

database with a single storage engine. You can improve performance by adjusting the parameters of the postgresql.conf file, or you can adjust the query and transaction. The PostgreSQL document provides a very detailed introduction to performance tuning. MySQL and PostgreSQL are highly configurable and can be optimized for different tasks. They all support the a

PostgreSQL tutorial (13): database management details, postgresql details I. Overview: A database can be considered as a name set of an SQL object (database object). Generally, each database object (table, function, etc.) belongs to only one database. However, for some system tables, such as pg_database, it belongs to the entire cluster. More accurately, a database is a set of patterns, and a schema contain

to re-compile and run it. Online debugging cannot be performed during running, but logs can only be played. In view of the above problems, we finally gave up. However, if you use gdb for debugging in linux, you cannot hold it. So use eclipse. Reference: http://wiki.postgresql.org/wiki/Working_with_Eclipse [1] My system environment: Centos6.4 _ x64 Gcc.4.4.7 Eclipse-c/c ++ kepler Postgresql 9.3 The following is my configuration process:1. install ne

Article title: Overview of tuning methods for Linux network performance tuning. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Author: Yao Ye He Xiaoyu Yang bangqing Hongyun 　　 In two articles: Tuning LINUX network performanc

Model Selection Models Selection　　An important task in ML is model selection, or using data to find the best model or parameter for a given task. This is also known as tuning. Individual estimators such as logistic regression can be adjusted, or the entire pipeline including multiple algorithms, features, and other steps may be adjusted. The user can adjust the entire pipeline at once without having to individually adjust each element in the pipeline.

Explain:1, JVM reuse is the content of the Hadoop tuning parameters, the performance of the hive has a very large impact, especially for the difficult to avoid small file scenes or more task scenes, such scenes most of the execution time is very short. The Hadoop default configuration is to use a derived JVM to perform the map and reduce tasks, which can cause considerable overhead in the JVM's startup process, especially if the job executed contains

I. Preface Index plays an important role in database performance. The advantages and disadvantages of index design directly affect the efficiency of DB execution. Therefore, when performing DB tuning, some of them will start to process the index. SQL server also provides a good tool for Database Engine Tuning Advisor and provides some advice on index creation and optimization. Ii. Index Overview In this re

Summary of database MySQL tuning practices and mysql tuning practices MySQL databases are widely used, with excellent stability and security. They have been verified by countless companies. It is far from enough to install and use MySQL. MySQL requires constant parameter adjustment or optimization settings to maximize its role. The content below is a summary of my work experience and work notes. It would be