lmr tuning

Database performance depends to a large extent on whether there is an appropriate index on the table. But workloads and data change at any time, and existing indexes may not be entirely appropriate, and new indexes may be required. However, it is very difficult to determine the index, because it can be promoted to a query, but it will have a negative effect on other queries or other operations. SQL Server provides the Database Engine Advisor (DTA) tool to help validate a set of optimal indexes f

An outline that is roughly written in the optimization content of the physical design and logical design of the DB, mainly physical design, logical design introduction of the content is not much, the outline of the physical structure design and example optimization of organic combination of the logical structure design and application adjustment together ... Oracle Performance Tuning Guidance outline Design of database physical structure and adjustm

, next we will add some of the SQL Server parallel operations, Then analysis of our daily write additions and deletions to these operators to optimize the items, interested in advance attention, about the SQL Server performance tuning of the content is very broad, followed by the analysis in the article.If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with SQL Server. L

. server.2005. Technical Insider "series ConclusionThis article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How server uses parallel operations to maximize the use of existing hardware resources to improve performance, is interested in advance attention, the content of SQL Server performance

higher, faster disk.2.5.1. Network performance evaluation（1）通过ping命令检测网络的连通性（2）通过netstat –i组合检测网络接口状况（3）通过netstat –r组合检测系统的路由表信息（4）通过sar –n组合显示系统的网络运行状态Three Linux server performance Tuning 1. Tuning the Linux kernel elevator algorithm for disk I/OWhen the file system is selected, the algorithm balances low latency requirements, collects enough data, and effectively organizes requests for disk reads and wr

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

Tags: Database Database tuning performance performance optimization MySQLSome time ago to help the company to optimize the database, with the previous study, step by step to learn knowledge for practice, finally is the speed of rubbing up, a query originally to execute more than 1 minutes now only need 3 seconds. These two weeks to summarize what they have learned and use, published a series of articles on the database, on the one hand to consolidate

Original link Address: http://www.transwarp.cn/news/detail?id=173 ETL is an important link in building data Warehouse. Through this process the user extracts the required data and imports the data warehouse according to the defined model. Because ETL is the necessary process of building data Warehouse, its efficiency will affect the construction of the whole data warehouse, so its effective tuning is of high importance. In practical applications, we u

There are fewer tutorials on iOS performance tuning, and the decision to write an iOS performance Tuning series focuses on several aspects of memory leaks, performance optimization, traffic, and power analysis.Xcode has provided a very powerful performance tuning tool, combined with several third-party tools and some techniques, to optimize performance very simpl

Note: This article is the third of our series of PHP performance analysis, click here to read PHP performance analysis first: Xhprof Xhgui Introduction, or PHP performance analysis second: In-depth study of Xhgui.In the first chapter of this series, we introduced Xhprof. In the second chapter, we studied the Xhgui UI, and now the last one, let's use Xhprof/xhgui's knowledge to work!Performance tuningCode that doesn't run is the perfect code. The other is just good code. Therefore, the best opti

Talking about linux Performance Tuning 12: Red Hat optimization strategy Tuned talking about linux Performance Tuning 11: Memory Allocation Management http://www.bkjia.com/ OS /201307/228761.html Red Hat launched a dynamic tuning solution, you can use different tuning schemes in different time periods. Because it exist

This article introduces JavaGC optimization practices. For more information about coders, see. This is the third article in the "GC Expert Series. In the first article, we learned the processing process of several different GC Algorithms in Java garbage collection, the working method of GC, and the difference between the new generation and the old generation. Therefore, you should have understood the five GC types in JDK 7 and their impact on performance. In the second article, the monitoring o

Linux performance tuning 5: tuning an important role in soft raid storage. RAID independent redundant disk arrays are classified into two types: raid card-based hard raid (hardware implementation, high speed, suitable for large applications), system-based soft raid (generally included in the kernel, performance is not as good as hard... linux performance tuning 5

Talking about linux performance tuning 9: changing system default limits; talking about linux performance tuning 8: Removing unnecessary overhead http://www.2cto.com/os/201307/228393.html After reading the first two articles, we are trying to save resources for our real services. Problem: our service is actually used... talking about linux performance tuning 9: c