apache spark performance tuning

Hive General learners and trainers in the performance optimization of the general will be from the syntax and parameters of these tricks point of view, but not revolutionary optimization of hive performance, the reasons for this phenomenon are: 1, historical reasons and stereotypes: When you learn SQL is generally a stand-alone db, this time your performance opti

add the following line to the boot auto mount in the/etc/fstab file: /dev/sdb1/ssd ext3 defaults00 Now we move MySQL to the new diskFirst stop the MySQL service: #service mysqld stop I suggest you?? Stop Apache/nginx at the same time to prevent any attempts to write to the database: #service httpd stop #service nginx stop Now copy the entire MySQL directory into the new partition: #cp/var/lib/mys

==> cache data in memory---> Performance tuning is primarily about putting data into memory operations---> Usage examples:// reading data from Oracle database, generating NBSP;DATAFRAMEVALNBSP;ORACLEDF =spark.read.format ("jdbc") .option ("url", " Jdbc:oracle:thin:@192.168.10.100:1521/orcl.example.com ") . Option ("DBTable", "Scott.emp") .option ("User", "Scott ") .option (" Password "," Tiger ") .load // w

· InnoDB Storage Engine 14. Using an Object-relational mapper (relational Mapper) With ORM (Object relational Mapper), you can gain reliable performance gains. All the things an ORM can do, can be written manually. However, this requires a senior expert. The most important thing about ORM is "Lazy Loading", that is to say, only when the need to take the value of the time to really do. But you also need to be careful about the side-effects of this mec

apache| Server | performance | optimization testing and improving performance The Apache server has been designed to be as fast as possible, and even if you use a machine that is not configured with a high configuration, you don't need to make too complex a setup, and its response content is enough to fill up all the p

keys from table_nameTime to create an index:Generally need to be indexed in the where and join clausesConsiderations for Using Indexes:In some cases like needs to be indexed, because in a wildcard % and - start query,mysql Do not use indexesSELECT * from table-name where name like ' % admin'; Besides, there's no way to do the math on the list.SELECT * from Users where Year (adddate) The operation on each row will cause the index to fail and perform a full table scan can be modified to select

xf master# cd major-mysqltuner-perl-993bc18/#./ mysqltuner.pl You will receive detailed reports and recommended tips for MySQL usage. The following is an example of the output from the default MariaDB installation: MySQL Performance Optimization 15. Optimize and Repair MySQL database Sometimes tables in the MYSQL/MARIADB database can easily crash, especially if the server shuts down unexpectedly, the file system suddenly crashes, or the database is

Testing and improving performanceThe Apache server has been designed to be as fast as possible, and even if you use a machine that is not configured with a high configuration, you don't need to make too complex a setup, and its response content is enough to fill up all the previous narrowband connections. But as the content of the site becomes increasingly complex and bandwidth increases, it becomes increasingly important to optimize

second, if this value is greater than 0, ibid.BI: Block device receives the number of blocks per second, where the block device refers to all the disk and other block devices on the system, the default block size is 1024byte, I have no IO operation on this machine, so has been 0;Bo: The number of blocks that a block device sends per second, such as when we read a file, the Bo will be greater than 0. Bi and Bo are generally close to 0, otherwise the IO is too frequent and needs to be adjusted.In

Lamp system performance optimization, Part 1: optimizing Apache and PHPHttp://www.ibm.com/developerworks/cn/linux/l-tune-lamp-2.html Apache Performance TuningHttp://www.devside.net/articles/apache-performance-

This article by show according to Lin Feng to provide friendship sponsorship, starting in the mud row world. Website Performance Stress testing is an essential part of the performance tuning process for server sites. Only let the server in the high-pressure situation, can really reflect the software, hardware and other improper settings exposed problems.

processors, chipset, voodoo, and other software. It supports most of the central processors and chipset, includingIntel, AMD, and cyrix, with four built-in optimization settings, you can set the hardware you want to optimize (central processor, CD-Rom, PCI bus, hard disk, disk array), kernel (including logs, security, resources), network (including IP, TCP, core, ICMP, Unix domain routing, ARP, Token Ring), virtual file system, performance memory man

Web site Performance Stress testing is an indispensable part of the performance tuning process of the server Web site. Only if the server is under high pressure, can the software, hardware and other improper settings be revealed. Performance testing Tools The most common is the following: AB, Http_load, Webbench, sieg

, and cyrix. It has four built-in optimization settings, you can set the hardware (central processor, CD-Rom, PCI bus, hard disk, and disk array) and kernel (including logs, security, and resources) to be optimized), network (including IP, TCP, core, ICMP, Unix domain routing, ARP, Token Ring), virtual file system, performance memory management (page allocation, high-speed cache, swap partition ). Powertweak is a powerful system

Apache Performance Test Tool AB use detailedReprinted from: http://www.jb51.net/article/59469.htmSubmission: Hebedich font: [Increase decrease] Type: Reprint time: 2015-01-05 I want to commentThis article mainly introduces the Apache Performance Test Tool AB use detailed, the need for friends can refer to the following

, performance tuning conflicts with system management goals. If you use a commercial version of Linux or rely on third-party support, you may have to consider vendor support.If you are alone, learn how to build a pack that can work with your release, and how to integrate it into the patch system. This ensures that the software and any changes you make are built in a consistent manner and can be used across

Web site Performance Stress testing is an indispensable part of the performance tuning process of the server Web site. Only if the server is under high pressure, can the software, hardware and other improper settings be revealed. Performance testing Tools The most common is the following: AB, Http_load, Webbench, sieg

1, performance test concept performance testing purposes: Evaluate system capabilities to verify that the system meets expected performance metrics Identify weaknesses in the system System tuning for improved system performance Detect problems that can o

1. Monitor Resin Parameters 1. Add the following segments to the resin. conf file: When you access http: // domain name/resin-status, you can monitor the performance of resin. 2. You can also use the resin-Admin Function. You need to add the following code in resin. conf: -Administration application/resin-Admin - -Password is the MD5 hash of the password. -Localhost is true to limit access to the localhost --> Enter