lmr tuning

Lead: Many seoer have encountered such a situation: the site is suddenly up and down, the ranking is not stable, today ranked up, after a period of time and down. There are some people in order to make the ranking in 20 keywords have Baidu's first ranking also to add some click Group, but the ranking is still unstable, what reason? Baidu ventilation? Baidu artificial? Is the chain quantity not enough? Don't you have any other efforts? Many seoer in the face of the above problems will always go

This technical article is provided by the "International Oracle user group" (ioug). It is an organization composed of user groups. This organization provides high-quality information, training, networking, and support, to improve the level of Oracle Database experts and database developers. This article is excerpted from the foreseeable procedural performance tuning of Oracle Applications by David Welch. Click here to become a member of the "Internati

Label: 1. IntroductionDatabase tuning can make database applications run faster, and it requires a comprehensive consideration of complex factors. Evenly distributing the data on disk can improve the I/O utilization, improve the reading and writing performance of the data, the appropriate degree of non-normalization can improve the performance of the system query, indexing and writing efficient SQL statements can effectively avoid low performance oper

Oracle Oracle Expert Tuning Secrets Objective 　　 Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of

SQLServerProfiler-performance tuning has enough reason to become a hot topic. Today's fierce competition in the business field, if users think that an application is too slow, they will immediately turn to another vendor. To meet user requirements, SQL tracking loads some event classes, which can be used to find and debug performance bottlenecks. Performance SQL Server Profiler-performance tuning has enough

Framework Official Guide Series 52--topic: Performance Tuning Summary: The performance of a network application is affected by many factors. Database access, file system operations, network bandwidth, and so on are all potential factors. Yii has reduced the performance impact of the framework in all aspects. But in the user's application there are still a lot of ... 2. Performance optimization of PHP optimization performance

I. Tuning needs to focus on several aspects Memory tuning Tuning CPU Usage Lock Competition Tuning I/O tuning Two. Twitter's biggest enemy: latencyWhat are some of the causes of the delay? The biggest impact factor is the GC Others are:

priorities, users can adjust without authorization.10. Reasonable control of the start time of the reduce taskIf the reduce task is started prematurely, it may reduce resource utilization by causing the "slot hoarding" phenomenon caused by the reduce task to occupy the reduce slot resource for long periods of time, and conversely, if the reduce task is started too late, it will cause the reduce Task gets the resource delay, increasing the run time of the job.three Task level parameters tuningTh

the job according to the importance of the job, the different important degree of the job allows the configuration of different priorities, users can adjust without authorization.10. Reasonable control of the start time of the reduce taskIf the reduce task is started prematurely, it may reduce resource utilization by causing the "slot hoarding" phenomenon caused by the reduce task to occupy the reduce slot resource for long periods of time, and conversely, if the reduce task is started too late

2YearSQL Server DBAOptimization Summary When I was a dBA for two years, I felt that some things needed to be shared and discussed with you. Book order 1. "in-depth analysis of SQL Server 2008 series" is the technical insider series of MSSQL 2005. I am also interested in version 2012. The technical insider series is my first book. It covers a large amount of content, but it's all just a few clicks. So many of them can be savedcarefully. 2. troubleshooting SQL server a guide for the accidental DBA

Oracle SQL tuning procedure The full name of SQL is Structured Query Language (Structured Query Language ). SQL is an industrial standard database query language used in the middle of 1980s. Do not confuse SQL with commercial products such as Microsoft SQL server or open-source MySQL. All SQL acronyms are part of the SQL standard. For more information about Oracle, see Oracle topics page http://www.bkjia.com/topicnews.aspx? Tid = 12I. adjustment befor

Spark Performance Tuning Series catalog: General Tuning Performance tuning to allocate more resources in real-world projects Performance tuning to adjust parallelism in real projects Performance tuning using Kryo serialization in real projects Performance

ObjectiveIn the previous few we analyzed a series of SQL Server-related performance tuning, which I divided into two modules.The first module focuses on the basic content of the master, a total of 6 articles to complete, covering a series of basic algorithms, the detailed analysis of how to view the execution plan, master Execution Plan optimization points, and a list of the everyday we usually write T-SQL statements will be applied operators. I belie

Talk about linux performance tuning 12: Red Hat optimization strategy Tuned talking about linux performance tuning 11: Memory Allocation Management http://www.2cto.com/os/201307/228761.html A dynamic tuning solution launched by RedHat allows you to use different tuning schemes in different time periods. By... talking a

. For example, when an index is deleted, the execution Plan of the corresponding SQL Plan baseline is deleted, this will not help avoid performance degradation. I personally think this is a comprehensive choice of Oracle, and it is not a limitation of SQL Plan Management. The SQL Tuning function of the Oracle database can generate an SQL profile to help the optimizer generate a well-adjusted plan. However, this mechanism is passive and does not guaran

I started to write this post before weeks ago and finally publish it even if it's not totally finish. it is just a little feedback about tuning a full lamp server with some user traffic and services load. important thing to notice is that all stuff in this post isNot the solution. You will probably have to tune little more for adapt all this to your personal server usage, server load, development architecture. so, use those tips as a kind of inspirat

JVM tuning (the most critical parameters are:-xms-xmx-xmn-xx:survivorratio-xx:maxtenuringthreshold)Generation Size tuning:Avoid the Cenozoic size setting too small, avoid the Cenozoic size settings too large, avoid survivor set too small or too large, reasonable set up the new generation survival cycle.-xmn Adjust the Cenozoic size, the larger the new generation usually means that more objects will be recycled in the minor GC phase, but it may be poss

In use. NET to start and develop the application quickly, the next problem may be the performance tuning aspects of the program, and performance tuning can sometimes involve all aspects of the problem, such as the program host system, database, network environment, and so on, and when the program is unusually large and complex, performance tuning will become even

First, memory tuning The kernel's options for memory are in the/PROC/SYS/VM directory. 1.pdflush, used to write back the dirty data in memory to the hard disk. Can be adjusted by/proc/sys/vm/vm.dirty_background_ratio. The first view of this value should be 10 by default. [Root@esf ~]# Cat/proc/sys/vm/dirty_background_ratio 10 This value is a threshold indicating that if the dirty data in memory reaches 10% of the total memory of the system, then

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 enu