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'; break; default: $ unit = 'unknown unit';} return sprintf ('%. 2f ', $ B ). $ unit ;}} Call: echo formatSize('20667564'); The result is: 19.71MB Note: Here, the $ B parameter is a number in the unit of B, and $ times is used to identify the number of recursion of this function. For the unit TB, PB, EB, and ZB that are not commonly used, refer to the following remarks (from the network ): 1 bit (this bit represents a binary number) 1 Byte (this word is also called "bit" but represents a he
gt; 1024 ){$ Temp = $ B/1024;Return formatSize ($ temp, $ times + 1 );} Else {$ Unit = 'B ';Switch ($ times ){Case '0': $ unit = 'B'; break;Case '1': $ unit = 'KB'; break;Case '2': $ unit = 'mb'; break;Case '3': $ unit = 'GB'; break;Case '4': $ unit = 'TB'; break;Case '5': $ unit = 'petab'; break;Case '6': $ unit = 'EB '; break;Case '7': $ unit = 'zb'; break;Default: $ unit = 'unknown unit ';}Return sprintf ('%. 2f', $ B). $ unit;}} Call: The code is as follows: Echo formatSize ('000000 ');
sprintf ('%.2f ', $b). $unit;}} Call:Copy the Code code as follows: Echo formatsize (' 20667564 ');The result is: 19.71MB Description Where the parameter $b is a number in B, $times is used to identify how many times the function is recursive. The non-commonly used units TB, PB, EB, ZB please refer to the following notes (from the network): 1bit (this bit represents a binary number)1Byte (this word is also called "bit") but it represents a hexadecimal number.1b=1byte=8bit1 KB = 1024x768 B (kb-k
(from the network):1bit (This bit represents a binary number)1Byte (This word is also called "bit") but it represents a hexadecimal number.1b=1byte=8bit1 KB = 1024x768 B (kb-kilobyte) thousand1 MB = KB (mb-megabyte) trillion1 GB = 1024x768 (gb-gigabyte)1 TB = 1024x768 (tb-terabyte) Too1 PB = 1024x768 TB (pb-petabyte) Pat1 EB = 1024x768 PB (eb-eksabyte) AI1 ZB = Zb-zettabyte (EB)1 YB = 1024x768 ZB (yb-yottabyte
'; Switch ($ times ){ Case '0': $ unit = 'B'; break; Case '1': $ unit = 'kb'; break; Case '2': $ unit = 'mb'; break; Case '3': $ unit = 'gb'; break; Case '4': $ unit = 'tb'; break; Case '5': $ unit = 'petab'; break; Case '6': $ unit = 'EB '; break; Case '7': $ unit = 'zb'; break; Default: $ unit = 'unknown unit '; } Return sprintf ('%. 2f', $ B). $ unit; } } Call: The Code is as follows:Echo formatSize ('000000 '); The result is: 19.71 MB Note: Here, the $ B parameter is a number in the uni
The code is as follows Copy Code byte conversionsfunction conversion ($size) {$KB = 1024; 1KB (Kibibyte, kilobytes) =1024b,$MB = 1024 * $KB; 1MB (Mebibyte, megabyte, abbreviation "trillion") =1024kb,$GB = 1024 * $MB; 1GB (gigabyte, Gigabyte, also known as "gigabit") =1024MB,$TB = 1024 * $GB; 1TB (terabyte, trillion bytes, too byte) =1024GB,$PB = 1024 * $TB; 1PB (Petabyte, quadrillion Byte, Pat Byte) =1024TB,$FB = 1024 * $PB; 1EB (Exaby
Exposure to computers all day, inevitably with a variety of measurement units to deal with, especially data, but you know bit, Byte, KB, GB, TB and so on all means how much data? Have you heard of EB, ZB, YB? Bit (bit) is the initials of binary digit, the unit that measures information, and the smallest unit that represents the amount of content, only 0 or 12 binary states. 8 bits make up a byte (byte), can hold an English character, and a Chinese character requires two bytes of storage space,
) Trillion M (Mebibyte) 1 MB = KB, Million bytes Thousand trillion G (Gigabyte) 1 GB = 1024x768, 1 billion bytes, gigabytes Too T (Terabyte) 1 TB = 1024x768, trillion bytes, MBytes Take P (Petabyte) 1 PB = 1024x768 TB, petabyte bytes, Pat Byte Ai E (Exabyte) 1 EB = 1024x768 PB, exascale bytes, Ai byte Ze Z (Z
harqprocess number field) (3) Each terabyte in space-division multiplexing has its own Rv/ndi purpose: to allow only one terabyte to be re-transmitted. That is, the 2 TB of empty division multiplexing is irrelevant, and when one of the terabytes fails, another successfully received TB does not need to be re-transmitted, and a successful TB harqprocess can be used for the next new pass. (upstream processing
ASM-scalability and limits [ID 370921.1] ASM imposes the following limits: (1) 63 disk groups in a storage system(2) 10,000 ASM disks in a storage system(3) 2 terabyte maximum storage for each ASM disk (the bug 6453944 allowed larger sizes, but that led to problems, see note 736891.1 "ORA-15196 with ASM disks larger than 2 TB ")(4) 40 exabyte maximum storage for each Storage System(5) 1 million files for each disk group(6) 2.4
bigfile tablespace is a tablespace with a single, but potentially very large (up to 4G blocks) data file. Traditional Smallfile tablespaces, in contrast, can contain multiple data files, and the files cannot be as large. The benefits of Bigfile tablespaces is the following: A bigfile tablespace with 8K blocks can contain a + terabyte data file. A bigfile tablespace with 32K blocks can contain a, terabyte
MySQL Group takes the first few records of each group (rank) with group by and order byHttp://www.jb51.net/article/31590.htm--group The data of the row with the maximum (small) value by a fieldThe code is as follows:/**/--Create the table and insert the data:The code is as follows:Create TableTB (namevarchar(Ten), Valint, Memovarchar( -)) Insert intoTbValues('a',2,'A2 (second value of a)') Insert intoTbValues('a',1,'the first value of a a1--a') Insert intoTbValues('a',3,'the third value of th
calculation is generally based on the metric-based and binary data calculation methods.(Binary) 1 byte (B) = 8 bits (B) bytes = 8 binary digits1 kilobyte (K/kb) = 2 ^ 10 bytes = 1,024 bytes kilobytes1 megabyte (M/MB) = 2 ^ 20 bytes = 1,048,576 bytes MB1 gigabyte (G/GB) = 2 ^ 30 bytes = 1,073,741,824 bytes Gigabit bytes1 terabyte (T/TB) = 2 ^ 40 bytes = 1,099,511,627,776 bytes KyrgyzstanSome storage manufacturers, especially hard drive manufacturers
. Yahoo! Opened an independent team to goug cutting specializing in the development of Hadoop.In January 2008, Hadoop became the top project for Apache. Hadoop was then successfully applied to other companies, including Last.fm, Facebook, the New York Times, and so on.In February 2008, Yahoo! announced that its search engine products were deployed on a Hadoop cluster with 10,000 cores.In April 2008, Hadoop broke the world record, known as the fastest system for sorting 1TB data. For a record of
SSDs Multiple index types (b-Tree, R-Tree, hash, full-text, etc.) Cost-based Optimizer Diagnostics and SQL Tracing Optimizer tracking JSON explanation OLTP and Transactions Acid Trading Commit, Roll back FOREIGN key Referential integrity Row-level locking Customizable lock Isolation Level Distributed Transactions (XA) Snapshot isolation Repeatable reads (Read
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----------------------------1t=10^12 1PB (petabyte bytes; MJ-level notation is "gigabit" bytes)=1024TB-------------------------1p=10^15 beats 1EB (Exabyte-byte; MJ-level notation is "hundred-jing" bytes)=1024PB--------------------------1e=10^18 ai 1ZB (Zettabyte-byte; MJ-level notation is "ten gai" bytes)= 1024x768 EB--------------------------1z=10^21 ze 1YB (Yottabyte-Yao byte; MJ-level notation is "trillion" bytes)= 1024x768 ZB----------------------
") =1024MB, 1TB (Trillionbyte trillion bytes byte) =1024g B, where 1024=2^10 (2 of 10), 1PB (petabyte quadrillion byte) =1024TB, 1EB (exabyte Bai byte bytes) =1024pb, 1ZB (Zett Abyte 10 trillion byte ze byte) = 1024 EB, 1YB (yottabyte 100 million bytes) = 1024 ZB, 1BB (brontobyte 100 billion bytes) = 1024 YB. Note: "Trillion" is a millions quantity unit.Attached: Full name and transliteration of the unit in the systemYotta, [Yao] it, Y. 10^21,Z
Computer storage unit bit (BIT) (binary digits): stores a bit of binary, that is, 0 or 1, the smallest storage unit. Byte: eight binary bits are one byte (B), the most common unit. That is, 1B (byte bytes) = 8 bit computer storage units are generally represented by B, kb, MB, GB, TB, Pb, EB, ZB, Yb, BB, the relationship between them is: 1 kb (kilobyte kilobytes) = 1024b, 1 MB (megabyte megabytes referred to as "megabytes") = 1024kb, 1 GB (gigabyte gigabytes, also known as "Gigabytes ") = 1024 MB
1bit=1 bit 2 binary information 1B (byte byte)1KB (kilobyte KB) =2 (Ten) b=1024b=2 (ten) B;1MB (Megabyte MBytes) =2 (Ten) kb=1024kb=2 B; equivalent to the content of a short story.1GB (Gigabyte gigabytes) =2 (mb=1024mb=2) B; the equivalent of a short story.1TB (Trillionbyte) =2 (gb=1024gb=2) B; equivalent to the music content of Beethoven's fifth movement Symphony.1PB (Petabyte) =2 (tb=1024tb=2) B; the equivalent of all the X-ray picture information in a large hospital.1EB (Exabyte-byte) =2 (pb=
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