megabytes to gigabytes

a global variable can see changes to the global variable. However, it only affects clients that are connected after a change to initialize the corresponding session variable from that global variable. It does not affect the session variables of the clients that are already connected (even the client that executes the SET global statement).When you use the startup option to set a variable, the variable value can use the suffix K, m, or G to represent kilobytes,

table space ALTER DATABASE datafile '/u01/app/test_data_01.dbf ' RESIZE 2G; 25. Querying the actual size of the database gives the actual size of the database in gigabytes SELECT SUM (bytes)/1024/1024/1024 as GB from Dba_data_files; 26. Querying the size of data in a database or database usage details gives the amount of space in the database that the data occupies SELECT SUM (bytes)/1024/1024/1024 as GB from Dba_segments; 27. The query mode or

]# chmod pw_2[find]# chmod 222 Pw_3[find]# chmod px_1[find]# chmod px_2[find]# chmod 111 Px_3[find]# LLfind ./ -perm +020 -type f--w--w----1 root root 0 15:13./pw_2--w--w--w-1 root root 0 15:13./pw_3[find]# LLfind ./ -perm -020 -type f--w--w----1 root root 0 15:13./pw_2--w--w--w-1 root root 0 15:13./pw_3When the permission bit is only one bit, + and-are the same.[find]# LLfind ./ -perm -222 -type f--w--w--w-1 root root 0 15:13./pw_3[find]# LLfind ./ -perm +222 -type f--w-------1 root root 0 15:1

Tags: Linux daily operation and maintenance management skills-monitoring system-likeLinux daily operation and maintenance management skills--monitoring system StatusFirst, check the disk status1.iostat–x Disk usage%util indicates io waits,2.iotop disk usage (dynamic display)Second,free to view memory usage1. The free command displays system usage and idle memory conditions, including physical memory, interactive area memory (swap), and kernel buffer memory. Shared memory will be ignoredCommand p

, the following statement assigns the value 0x10 to the variable $a:PS c:\> $a =0x10ps c:\> $a 16If you want to assign an exponential value to a variable, you need to enter the root number, the letter "E", and a number that represents a multiple of 10. For example, to assign a power value of 3.1415 to a $a variable, enter:PS c:\> $a =3.1415e2ps c:\> $a 314.15You can also convert kilobytes (KB), megabytes (MB), and

, and Async Umount: Uninstall command # Umount DEVICE # Umount Mount_point To view the process that is accessing the specified mount point: # fuser-v Mount_point Terminates all processes that are accessing the specified mount point: # fuser-km Mount_point Swap partition: Free command: View the usage status of memory and swap -M: in megabytes -G: in gigabytes Mkswap: Creating Swap partitions mkswap [option]

partition, Vmstat provides statistics on I/O resultsPs/pstreeSystem analysis of the most commonly used commands, PS provides a list of running processesThe Pstree command can display all process information in a tree-like structure, and can integrate child process informationSarThe SAR program is also part of the Sysstat installation package for mobile, reporting, and storage System information.SAR command three application compositionSAR: Used to display dataSA1/SA2: Used to collect and store

/Manual mountMount/dev/sdb1/mntNote: Copy the data to the U-disk, you need to enter sync to sync the files, and perform at least 3 times to ensure the data is fine.Disk Management Common ToolsMemory Space usage Status:free [OPTION]-M: in megabytes-G: in gigabytes-H: Easy-to-read format650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M01/86/97/wKiom1fE7GuiPMpsAAAZDYkBmvs065.png "title=" 40.png "alt=" W

, and the use of swap space does not mark the occurrence of a memory bottleneck. Parameters useful for the free command:The references-b,-k,-m and-G respectively follow bytes, kilobytes, megabytes, gigabytes display results.-l difference shows low and high memory-c {count} shows the number of free outputsNine, PmapThe PMAP command shows the amount of memory used by one or more processes, and you can use thi

This section of the content is a little miscellaneous, you can only manually enter theThe 1.uname command is used to print information about the current system (kernel version number, hardware architecture, host name, operating system type, and so on).Uname-a Show All information2.cat/etc/redhat-releaseView current system version3.free-m/GView memory usage (in megabytes and gigabytes)The information display

zombie PID line: Process ID; Process owner; Process priority (PR); Nice value, negative indicates high priority, positive values represent low priority; VIRT, total amount of virtual memory used by the process, in kilobytes. Virt=swap+res;res, the size of the physical memory, in kilobytes, that the process uses and has not been swapped out. Res=code+data; FreeThe free command displays system usage and idle memory conditions, including physical memory, interactive area memory (s

Burn a CD or DVD in Windows Media Player. When you copy music, pictures, and videos from your computer to a blank CD or DVD, this is called burning. With Windows Media Player, you can burn three of discs: audio CDs, data CDs, and data DVDs. To determine which disc you should use, you need to consider what you want to copy, what size you want to copy, and how you want to play the disc. The following table can help you determine which type of disc is right for you. Audio CD: Select this option i

: Windows 7 Disk Management tool interface Let's take a look at how to compress a partition (that is, C, D, and so on), and part of it to create a new partition. Right-click to select a compressed volume on the disk character that needs to be reduced. Right-click on the partition to select the compressed volume The system will then pop up a prompt window "Please wait while the volume is being queried for available compressed space." A new Adjustment Partition dialog b

=" Wkiom1c9wkozc_twaaazw3fcmqk534.png "/>Regular Expressions:1) Find with "! "To negate the argument.Find./! -name ' *.c '-print find file names that are not. C and print them out. (The actual rear-print can be not, the effect will be displayed on the screen)650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/80/49/wKioL1c9XnrxDwa7AAB4Y2QnZuA829.png "title=" Find3.png "alt=" Wkiol1c9xnrxdwa7aab4y2qnzua829.png "/>2) If you want to match one of several conditions, you can use the-o paramete

=" Wkiol1dbzqcy2wqkaaa6vubxemy746.png "/> Find./-mtime-3 finds files that have been modified less than or equal to 3 days650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/80/6F/wKiom1dBZcOjtkrhAAAsANHjqQY807.png "title=" Picture 4.png "alt=" Wkiom1dbzcojtkrhaaasanhjqqy807.png "/> Find./-newer file lists files that are newer than650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/80/6F/wKiom1dBZdLAoTWAAAAWPlXvTbA943.png "title=" Picture 5.png "alt=" Wkiom1dbzdlaotwaaaawplxvtba943

Official Document Address: https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.htmlThe following records are received:-xx:maxheapsize=Size Sets the maximum size (in byes) of the memory allocation pool. This value must is a multiple of 1024x768 and greater than 2 MB. Append the Letterk ork to indicate kilobytes, m orm to indicate megabytes, g org to indicate gigabytes. The default value is

materialized views are enabled, and cost based optimization is enabled. Value Range: TRUE | False Default value: False Pga_aggregate_target = 25165824 Description: Specifies the target PGA total memory for all server processes connected to the routine. Set this parameter to a positive number before you enable the automatic setting of the workspace. This part of memory does not reside in the SGA. The database uses this parameter value as the amount of PGA memory it is using. When this parameter

described in detail;(4) Be aware that the Docker host side is configured with swap. Memory swapping can affect performance and speed, but it can play a role in buffering when system memory is tight.(5) If possible, transform the container into a service process and then use the Service-level limit or node labels to ensure that the application has sufficient memory to run on the host. 1.2 Memory limits for containersThe memory resource limit for a container is either hard limit or soft limit.For

Active support is a set of libraries provided with rails, active support extends some of the classes in Ruby, and this time we'll look at some of the most common features. 1. Extension of the number type The Fixnum class adds two methods: even and odd? The scaling method is also added: Puts 20.bytes #=> 20 Puts 20.kilobytes #=> 20480 Puts 20.megabytes #=> 20971520 Puts 20.gigabytes #=> 21474836480 P

want to keep after shutting down must be placed there. In summary, there are these stores around the CPU: Storage Area Unit of Measure CPU Registers bytes CPU Cache Kilobytes Ram Megabytes Disk drive Gigabytes You can see that the farther away the CPU is, the larger the storage. In theo