qsfp28 100g

Tags: style http color io os using AR for filePrefaceWhether it is a blog park or CSDN, see a lot of friends on the database understanding, understanding or not break through a bottleneck, and this bottleneck is often just a layer of window paper, over which you will see a new world.04, 05 When doing the project, with SQL Server 2000, the core table (most of the key functions used frequently every time to use) to reach 8 million data volume, long ago looked up some related tables, some reached m

backup; Disk utilization is 50%, that is, 2 100G of disk composition RAID1 can only provide 100G of free space. RAID-5 Characteristics: The use of parity check, high reliability The disk checksum is hashed to a different disk, increasing the read and write rate. Data cannot be restored only if two disks are lost at the same time At least three hard drives and the hard disk

edited text file into the *nix, each line is more than a ^m.Solve:1) write the script again under Linux;2) vi:%s/r//g:%s/^m//g (^m input with ctrl+v,ctrl+m)Attached: sh-x script file name, you can step into and echo the results, to help troubleshoot complex scripting problems.2.crontab output Result control problem: /var/spool/clientmqueue directory takes up more than 100G Cause: cron The program executed in the output content, the output will

, compaction, will lead to cluster response time fluctuation is very large, region number too much not only to bring trouble to the management, and even will cause some Hbase bug 。 The average 512M or less is a small region. The large region is less suitable for frequent split and compaction, because doing a compact and split will result in a longer pause and a very large impact on the read and write performance of the application.In addition, the large region means that larger storefile,compact

Tags: linu/etc/body Select Ignore app backup and PNGLinux server to add a new hard disk, you can directly format the disk can be used, such as mount in the/usr/local directory, but there is a drawback, that is, if this disk full, the subsequent want to expand, can not continue to mount this/usr/local mount point, There is a certain amount of trouble with scaling, so we recommend using LVM to support dynamically expanding disks. Detailed how to do this is described below.1, to view the new disk,

Linux command line shortcut keysShortcut keys: Tab Auto-complete path directory name, +l (lowercase) Clear screen, CTRL ++ + +e (lowercase) to command line end shortcut: Ctrl+k Delete/ cut the contents of the cursor to the end of the line shortcut key: Ctrl+u Delete/ cut the cursor position to the beginning of the content shortcut: Ctrl +y paste shortcut key: Ctrl+r Find history command shortcut: Ctrl+ left and rig

-character-set=gbk default-storage-engine=INNODB sql-mode=”STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION” max_connections=100 query_cache_size=0 table_cache=256 tmp_table_size=50M thread_cache_size=8 myisam_max_sort_file_size=100G myisam_max_extra_sort_file_size=100G myisam_sort_buffer_size=100M key_buffer_size=82M read_buffer_size=64K read_rnd_buffer_size=256K

in the variable "open-files-limit" in# section [mysqld_safe]table_cache=256# Maximum size for internal (in-memory) temporary tables. If a table# grows larger than this value, it is automatically converted to disk# based table This limitation is for a single table. There can be many# of them.tmp_table_size=15M# How many threads we should keep in a cache for reuse. When a client# disconnects, the client's threads are put in the cache if there aren't# more than thread_cache_size threads from befor

@ hank-yoon servers] # cat install. sh script content#! /Bin/bash# CheckEcho-e "\ 033 [; 37; 34 mCheck Memory Size... \ 033 [0 m"If ['free-g | grep ^ Mem | awk '{print $2 }''! = 125]ThenRead-p "Memory size is 'free-g | grep ^ Mem | awk '{print $2}'' G, enter innodb_buffer_pool_size (default 20G): "poolElseEcho-e "\ 033 [; 37; 32 mMemory Size is 125G, innodb_buffer_pool_size set 100G \ 033 [0 m"FiEcho-e "\ 033 [; 37; 34 mCheck Network... \ 033 [0 m"#

Recently tested and recorded. Three conditions apply to Windows2008 and above operating systems. The Windows2003 is suitable for 1 or 2 cases.One, virtual machine Case 1:1, 1 Disk 500G (basic disk MBR partition), with partition C, disk D.Extension: The vcenter can scale up to 2TB and can be extended to the D drive in the virtual machine.Second, virtual machine situation 2:1, 1 Disk 100G (basic disk MBR partition) C drive.2, 1 Disk 500G (basic disk MBR

threads we shoshould keep in a cache for reuse. when a client # disconnects, the client's threads are put in the cache if there aren't # more than thread_cache_size threads from before. this greatly reduces # the amount of thread creations needed if you have a lot of new # connections. (Normally this doesn't give a notable performance # improvement if you have a good thread implementation .) thread_cache_size = 8 # *** MyISAM Specific options # The maximum size of the temporary file MySQL is al

(preferably dividing the partition size), the data is redundant, when the storage is written to two hard disks, data backup, disk utilization is 50%, That is, 2 fast 100G hard drive composition RAID1 can only provide 100G of free space. 650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/7D/56/wKiom1bmWO-xth2iAABA5jUUcWU553.png "title=" 2.png " alt= "Wkiom1bmwo-xth2iaaba5juucwu553.png"/>3.raid-5: Re

= Sessionid2actionrdd.persist (Storagelevel.memory_only ());IV: Using broadcast variablesBroadcast variables,is actually Sparkcontext's broadcast () method, passing in the variable you want to broadcast, you canFinal broadcastLike randomly extracted map,1m, for example. It's still small. If you read some dimension data from which table, let's say, the information for all commodity categories is used in some operator function. 100M. 1000 of tasks. 100G