cassandra performance tuning

Runnable because the subclass will have its own property creation that requires more overheadControl maximum concurrency: Use Java's executors class to control the thread pool maximum thread concurrency through Executors.newfixedthreadpool (nthreads).HTTP requests increase timeout, the database caches HTTP response, and the cache expiration time is determined based on the Cache-control domain in the HTTP cast message.frequently accessed, or once access consumes a large data cache.LayoutUse abst

Today we will mainly talk about the DB2 Performance Tuning design and configuration of your database. There are many database design and configuration options that can affect the query performance. For more suggestions on Database Design, see the "Planning your Physical Database Design" Best Practices article. Use constraints of DB2

Tags: comparing field name performance created description RMS emp_table style 5.7Background: The author's source data a table about 7000多万条, data size 36G, index 6G, add up table space has 40g+, similar table has 4, a total of more than 200 million Database MySQL, engine for InnoDB, version 5.7, server memory 256G, physical memory several T, hardware parameters of the leverage, but processing these data trampled a lot of pits, because For not doing t

milliseconds) above and the maximum wait time as a reference. Using the information provided by Sys.sysprocesses to count, about sys.sysprocesses use can refer to "SQL Server performance tuning from user session state analysis". This view listens for blocking information over a period of time. You can set a monitor statement to run every 10 seconds, storing blocking and blocking.Thoughts are as follows:--F

data, empirical data, and disk nominal values, it is not difficult to identify potential or already occurring problems with disk I/O when necessary, using the CPU, memory, and swap partitions. But how to avoid and solve these problems? This requires knowledge and technology for disk I/O performance optimization. Limited to the topic and length of this article, only a few commonly used optimization methods for readers to reference:1. Adjust the data l

Systemios--Carlo InspectionLayout optimizationTodo:Power optimizationTodo:Start optimizationToday's Headlines iOS client startup speed optimizationWWDC Session notes: App startup time optimizationBaidu Input Method-ios start speed optimizationHow Facebook IOS app optimizes startup timeObj China-mach-o executable fileVolume optimizationiOS installation package SlimmingToday's Headlines IPA installation package optimizationiOS slimming removal of useless mach-o files in the frameworkAn iOS packag

MySQL Performance tuning my.cnf detailedHttps://blog.linuxeye.cn/379.htmlProvides a MySQL 5.6 version suitable for MY.CNF profiles on 1GB memory VPS (click here to download the file): [Client] Port = 3306 Socket =/tmp/mysql.sock [Mysqld] Port = 3306 Socket =/tmp/mysql.sock Basedir =/usr/local/mysql DataDir =/data/mysql Pid-file =/data/mysql/mysql.pid user = MySQL bind-address =

embedded devices, or memory, hard disk space, etc., by using the method of sacrificing CPU, to obtain the original need more memory or hard disk space to complete the work;3. A very simple time to change the space of the algorithm: the implementation of a, b two variable value exchange. The commonly used algorithm is to use the intermediate variables, and the introduction of additional variables means that more space is to be used, the following algorithm, you can eliminate the intermediate var

can pay attention to the 0.9 release released soon. The developer also rewritten a set of consumer in Java. Combine the two sets of APIs and remove the dependency on zookeeper. It is said that performance has greatly improved OH ~ ~ list of all parameter configurationsBroker default parameters and configurable list of all parameters:http://blog.csdn.net/lizhitao/article/details/25667831Kafka principle, basic concept, broker,producer,consumer,top

Official tools: Web address: HTTP://PAN.BAIDU.COM/S/1PKGRSRPOfficial: Https://download.xamarin.com/profiler/profiler-windows.msiXamarin Profiler, using this tool, helps us to tune software performance to find the bottleneck of the application.A high memory-intensive code call is monitored. Quickly resolve code that affects program performance.For the use of this tool, see:https://developer.xamarin.com/guides/cross-platform/deployment,_testing,_and_met

1 , JAVA Performance Tuning-do not use expressions in loop conditionsWhen we learn about Java Performance Tuning, we often see this passage: In the case of No compilation optimization, in the loop, the loop condition will be repeatedly calculated, if you do not use complex expressions, and the loop condition value is n

a text teaches you database performance tuning (attached to a large hospital real case) Preface An engineer at Microsoft once had a very figurative metaphor for performance tuning: Peeling onions. I also very much agree, let us to a layer of a layer of the outside its mysterious veil. six major factors The followi

Label:MySQL performance checking and tuning methodPublished: October 4, 2009 published by: OurmysqlSource: Sudone.com was read: 3,524 times only 1 ReviewsI have been using MySQL this database software, it works relatively stable, high efficiency. In the face of severe performance problems, there are generally several possibilities: 1, the index is no

, default is 2 Reviews: These two parameters control the merging and splitting of the PG directory, and when the number of files in the directory is less than filestore_merge_threshold that, the object files of the directory are merged into the parent directory, and if the number of files is greater than the directory filestore_merge_threshold*16*filestore_split_multiple , the directory is split into two subdirectories. Set a reasonable value to speed up indexing of object files

]: MySQL 08:32:38> change MASTER toMaster_host= ' 192.168.0.1 ',Master_user= ' Repl ',Master_password= ' PASSWORD ',Master_log_file= ' mysql-bin.000035 ',master_log_pos=399;After executing the change MASTER to command, you can start SLAVE with the following command:[email protected]: MySQL 08:33:49> START SLAVE;At this point, our Replication environment is built. Reader friends can do their own tests to try to build, if you need to understand the MySQL replication build process More detailed ste

The DB2 tutorial you are looking at is: IBM DB2 basic Performance tuning. Buffer pool If you have experience using DB2 UDB, you should know that the buffer pool is a space in memory that is allocated separately to the DB2 database manager, allowing it to add new data to the database or to respond to a query that returns a buffer from the disk to some data data pages.Because accessing data from memory is bo

Tags: different issues lob STR Peak Multi-table BSP must not1.MySQL Performance Tuning IdeasWhat if a server has a long time load too high/ periodic load is too large , or occasionally stuck how to handle ? is it a cyclical change or an occasional problem ? is a problem with overall server performance , or the question of a single statement? ? specific to a sing

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

Article Title: Linux performance monitoring and tuning (CPU ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In fact, there are many articles on this part on the Internet. Why is this article still available? There are several reasons why it is the motivation of my tra

Hardware preparation environment: Hard Disk: 16 SAS15KRAID5 with 512 MCacheCPU: AMD4 core two memory: 16 GB software environment: Operating System: RedHatAS4.62.6.9 Hardware preparation environment: Hard Disk: 16 SAS 15 K RAID5 with 512 MCacheCPU: AMD 4-core two-core memory: 16 GB software environment: Operating System: RedHat AS4.6 2.6.9 Hardware preparation environment: Hard drive: 16 SAS 15 k raid 5 with 512 MCache CPU: AMD 4-core two Memory: 16 GB Software environment: Operating System: