spt tuning

　One, what is fine-tuning Fine-tuning is the long-term unchanged page, the local changes to the site, the text, pictures, layout and the position of the forum to adjust. 　Second, why to fine-tune For the long-term unchanged page, we need to adjust the page, thereby driving the website update, reduce 304 status code; User needs are constantly changing, improve conversion rate needs fine-

SEO optimization in the site, you have encountered the following problems, we have passed the period of the new station into the middle of the optimization, but no matter how we send out the chain, update the site snapshot of the article is like a snail motionless, when our optimization seems to enter the bottleneck period, A keyword when we do and we do in the middle of the time his customer search needs are different, if our content and layout has always been the original appearance then our s

SQL Auto-tuning is an Oracle-brought tuning tool that provides solutions.This time I mainly introduce the following automatic SQL tuning tools: Automatic SQL tuning (Automatic SQL tuning) SQL Tuning toolset (SQL

range. That doesn't make sense either. For performance testing, we also need to define a time period. For example, it lasts 15 minutes on a certain throughput. Because the system becomes unstable when the load arrives, the system will stabilize after a two-minute time. In addition, it is possible that your system behaves normally in the first few minutes of the load, and then it is unstable and even collapsed. So it takes so long. This value, we call the peak limit. The performance test

even untimely, it should be understood. has been in the Java community for nearly 3 years, for some performance tuning topic I have been stuck in the mouth, just for last night saw a performance tuning article, I can't help it .Tomcat Performance Tuning:Locate the Conf directory under the Tomcat root directory and modify the contents of the Server.xml file . For this part of the

. Orderid,o1. Freightfrom Orders o1where O1. Freight>( SELECT AVG. O2. Freight) from Orders O2)The goal of SQL execution is to query orders that have more than the average shipping charge in the order.The clause that extracts the average freight here is a completely independent subquery that executes independently of the main query. At the same time here we take advantage of a scalar computation (AVG) so that it returns exactly one row.Look at the query plan for the statement:This query plan

excerpt from: http://uule.iteye.com/blog/2114697Summary of JVM garbage collection and performance tuningSeveral strategies for tuning the JVMFirst, JVM memory model and garbage collection algorithm1. According to the Java Virtual Machine specification, theJVM divides the memory into: New (Young Generation) Tenured (old generation) Permanent generation (Perm) Where new and tenured belong to heap memory, heap memory is allocated fr

Fine-tuning, as the name suggests, is a small very subtle adjustment. Office fine-tuning technology is only a small function, but it can be applied to a lot of details of the operation, small tricks of great use. Do not believe that you look at the following skills, while looking at the operation, see is not. 1: Use fine tuning to quickly change text size

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 tuning parameters and techniques to improve the performance of your Oracle d

Label:I believe a lot of friends, whether it is to do development, architecture, or DBA, are often heard of the word "tuning". Talk about "tuning", may make a lot of technical staff heart passion, also may make a lot of people feel distressed, do not know how to start. Of course, there are many people who are dismissive of this, because not everyone does the project is very high performance requirements. In

. NET Performance Tuning series articles Series Article Index . NET Performance tuning: Use of the ANTS performance Profiler . NET Performance Tuning two: Code metrics with Visual Studio . NET Performance Tuning three: tuning tools and methods for YSlow related r

Label:Original: SQL Server Tuning Series advanced (in-depth profiling statistics)ObjectiveAfter the analysis of the previous few, in fact, in general has been the first glimpse of the importance of SQL Server statistics, so this article will be sacrificed this artifact.This content will be very long, sit good bench, melon seeds snacks and so on ...No nonsense, go to the chase.Technical preparationThe database version is SQL SERVER2008R2, which is anal

Data Engine Tuning Advisor is one of the database performance tuning tools provided by sqlserver. Let's take a look at how to use this tool to optimize database design. Database Engine Tuning Advisor Tuning Recommend the best mix of indexes for databases by using the query optimizer to analyze queries in a worklo

Tuning OverviewMost spark job performance is mainly consumed in the shuffle link, because this link contains a lot of disk IO, serialization, network data transmission and other operations. Therefore, if you want to make the performance of the job to a higher level, it is necessary to tune the shuffle process. But it's also important to remind you that the factors that affect the performance of a spark job are primarily code development, resource para

Tuning OverviewMost spark job performance is mainly consumed in the shuffle link, because this link contains a lot of disk IO, serialization, network data transmission and other operations. Therefore, if you want to make the performance of the job to a higher level, it is necessary to tune the shuffle process. But it's also important to remind you that the factors that affect the performance of a spark job are primarily code development, resource para

Previous section Study reviewIn the previous section, the main study of the sun jdk some of the command line and visual performance monitoring tools for specific use, but the focus of performance analysis is to solve the problem of the idea, there is no good ideas, and then good tools are futile.This section focuses on learningIn the book, the main content of this section is to talk about the author in the work process of some of the best experience in combat. For our readers, the focus is to le

1.JVM Tuning Summary (1): Some concepts: http://www.importnew.com/18694.html2.JVM Tuning Summary (2): Basic garbage collection algorithm: http://www.importnew.com/18740.html3.JVM Tuning Summary (3): Problems with garbage collection: http://www.importnew.com/18747.html4.JVM Tuning Summary (4): Generational garbage colle

. When a query is executed, SQL Server does not read more or less data than is actually required, so when executing the same query on the same dataset, the resulting logical read numbers are always the same.Why is it important to know the logical read value of SQL Server when executing queries in tuning query performance? Because this number does not change each time the same query is executed. So, when it comes to

In earlier articles, the detect methodology in performance tuning was mentioned, and the Detect methodology was briefly reviewed here.Discover the problem: finding problemsExplore The conditions: Reasons to exploreTrack down possible approaches: providing a possible solutionExecute the most likely approach: perform the best possible solutionCheck of Success: Confirm success (if not successful, repeat the above steps)Tie up Loose Ends: complete Remaini

Resource parameter tuningOnce you understand the fundamentals of the spark job run, the parameters related to the resource are easy to understand. The so-called Spark resource parameter tuning, in fact, is the spark in the process of running the various resources used in the place, by adjusting various parameters to optimize the efficiency of resource use, thereby improving the performance of spark job. The following parameters are the main resource p