jd tuning

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

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 tuning parameters and techniques to improve the performance of your Oracle database.Ora

Hu Xi, "Apache Kafka actual Combat" author, Beihang University Master of Computer Science, is currently a mutual gold company computing platform director, has worked in IBM, Sogou, Weibo and other companies. Domestic active Kafka code contributor.ObjectiveAlthough Apache Kafka is now fully evolved into a streaming processing platform, most users still use their core functions: Message Queuing. For how to effectively monitor and tune Kafka is a big topic, many users have such a problem, today we

threads.Of course, here are a few thread operations can set their own, the maximum recommended for the current system configuration of the logical core number, of course, the large set can be just useless.Second , index Hint hints (index Hint)The so-called index hint hint is to force the query optimizer to perform a scan of a query statement or use a specified index.In this way, we often use in the tuning of a way, many times we create the index is i

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

Original: 2-year summary of SQL Server DBA tuning2 years SQL Server DBA Summary of tuningWhen I was 2 DBA I felt that there was something that needed to be shared with everyone to discuss the book first.Book List1. "In-depth analysis of SQL Server 2008 series" This is the MSSQL 2005 Technology Insider series. Version 2012 also out of interest can see, Technical Insider Series is I contact the earliest book, inside the content is very large, but are donuts. So many of them can be carefully tasted

Five areas of Sybase database application system tuning2011/3/14/13:49 Source: HC IT network Taking "the Internet banking system of a large commercial bank" as an example, this paper deals with five major areas of database application system tuning: Stress testing, application-side tuning, server-side tuning, optimization of system platform layer, optimization of

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

Tags: mysql performance optimization tuning-primer.shTuning-primer.sh detects the current operation of MySQL, generates reports, and gives recommendations for optimization. Download and use:1.wget http://www.day32.com/MySQL/tuning-primer.sh2. Copy the tuning-primer.sh to the my.cnf Sibling directory3.chmod +xtuning-primer.sh Execution: SH

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