linux deduplication

Article title: Sorting and deduplication of large files in Linux. 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. Duplicate row removal The simple usage is as follows, for example,

requirements of the system and increase the data compression ratio, we usually need to apply the data deletion technology first, then, we use the data compression technology to further reduce the volume of the "structure chart" and basic data blocks. What will happen if the order is reversed? Compression re-encodes the data, which destroys the native Redundant Structure of the data. Therefore, the effect of deduplication is greatly reduced, and more

Python list deduplication method you should know, python list deduplication Method Preface List deduplication is a common problem when writing Python scripts, because no matter where the source data comes from, when we convert it into a list, the expected results may not be our final results, the most common thing is that the Meta in the list is repeated. At this

Disable Windows deduplication and windows deduplication Deduplication can reduce disk usage, but improper use may also increase IO. In addition, this function also blocks the hard disk. Therefore, when the hard disk usage is high, it is also difficult to fragment, So you sometimes need to disable the deduplication fun

This article mainly introduces the sample code for de-duplication and de-duplication of JS arrays. If you need it, you can refer to it for help. Method 1: deduplication The Code is as follows: ScriptArray. prototype. distinct = function (){Var a = [], B = [];For (var prop in this ){Var d = this [prop];If (d = a [prop]) continue; // prevents loops to prototypeIf (B [d]! = 1 ){A. push (d );B [d] = 1;}}Return;}Var x = ['A', 'B', 'C', 'D', 'B', 'A', 'A',

Array deduplication Array, Array deduplication Array var aee3=[31,42,13,19,5,11,8,13,40,39,1,8,44,15,3]; Array.prototype.unqu2=function(){ this.sort(); var arr2=[this[0]]; for (var j = 1; j There are a lot of de-duplication methods on the Internet, and the most stupid is the second method, and the best efficiency is the third one.

Simple example of php array deduplication (one-dimensional and two-dimensional array deduplication) $ Aa = array ("apple", "banana", "pear", "apple", "wail", "watermalon "); $ Bb = array_unique ($ aa ); Print_r ($ bb ); ?> Output result: Array ([0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon ).2. duplicate items of two-dimensional PHP

PHP two-dimensional array deduplication algorithm, PHP two-dimensional array deduplication Algorithm Requirement The following two-dimensional array is available: Array (8) {[0] => array (2) {["name"] => string (4) "name" ["value"] => string (6) "qingye"} [1] => array (2) {["name"] => string (5) "phone" ["value"] => string (11) "13812341234"} [2] => array (2) {["name"] => string (12) "fileds_507 []" ["value

I. Planning the deployment goalsData deduplication for Windows 8.1server 2012 is designed to be installed on the primary data volume without adding any additional dedicated hardware. This means that you can install and use the feature without affecting the primary workload on the server. The default is non-invasive because they allow the data "lifetime" to reach five days before a particular file is processed, and the default minimum file size is up t

Timespan: 1.22-1.23Chun-ho ng, mingcao Ma, Tsz-yeung Wong, Patrick P. C. Lee, John C. S. Lui:Live deduplication storage of Virtual Machine images in an open-source cloud. Middleware 2011: 81-100 (GS: 3) This article proposes livedfs, a de-duplicated file system. Livedfs is modified based on the Linux File System (ext3) with the deduplication function added. It

Hyper-V Server data deduplication technologySwaiiow heard that the new technology in Windows Server 2012 is called Deduplication, which is said to save disk space significantly, and let's look at what deduplication is:Data deduplication refers to finding and deleting duplicates in the data without affecting their fidel

Q: What are the advantages and disadvantages of the software-based deduplication and hardware-based deduplication products? A: software-based deduplication aims to eliminate source redundancy, while hardware-based deduplication emphasizes data reduction of the storage system. Although bandwidth compensation cannot

In Windows 2012, you can enable data deduplication for non-system volumes. Deduplication optimizes volume storage by locating redundant data in the volume, and then ensuring that the data is saved in only one copy of the volume. This is accomplished by storing the data in a single location and providing this location reference for other redundant copies of the data. Since data is divided into 32-128kb chunk

research on high performance data deduplication and detection and deletion technologyHere are some fragmentary data about the re-deletion of things, previously summarized, put on can communicate with you.The explosion of 1 data volumes brings new challenges to the capacity, throughput performance, scalability, reliability, security, maintainability, and Energy management of existing storage systems, eliminating redundant information and optimizing sto

Http://hub.opensolaris.org/bin/view/Community+Group+zfs/WebHome Https://blogs.oracle.com/bonwick/entry/zfs_dedup Zfs and data deduplication What is deduplication? Deduplication is the process of eliminating duplicate data. The deduplication process can be based on the file-level file level, block-level block

Label:Let's say we have a MongoDB collection, take this simple set as an example, we need to include how many different mobile phone numbers in the collection, the first thought is to use the DISTINCT keyword, db.tokencaller.distinct (' Caller '). Length If you want to see specific and different phone numbers, then you can omit the length property, since db.tokencaller.distinct (' Caller ') returns an array of all the mobile phone numbers. but is this a way of satisfying all things? Not

Reading: deduplicationThe emergence of technology has a certain source, so we should start from the beginning. Although the current price of storage media has plummeted, the Unit storage cost is already very low. But it still cannot keep up with the growth rate of enterprise data files. As a result, energy consumption, data backup management, and so on have become difficult issues. In addition, some duplicate files also increase. To this end, enterprises urgently need a technology to ensure that

INSERT into table (ID, name, age) VALUES (1, "A", +) on duplicate key update name=values (name), Age=values (age)/* Insert Data: If there are duplicates, select Update; */Insert ignore into ' testtable ' (' Mpass ', ' Pass ') select Mpass,pass from Rr_pass_0 limit 0,1000000replace into ' testtable ' ( ' Mpass ', ' Pass ') select Mpass,pass from Rr_pass_0 limit 0,10Set PRIMARY key: Discard if duplicate data is selected;SELECT *, COUNT (distinct name) from the table group by nameQuerying for dupli

Tags: where div from greater than equals join AC Max ack reservedQuery for the number of elements not repeatingElements in the query table with a number of elements greater than or equal to 2SELECT goods_id,goods_name from Tdb_goods GROUP by Goods_name have COUNT (goods_name) >=2; Then use the left join to connect the original table with the above query results, delete duplicate records, and keep records with smaller IDsIf you want to keep the same ID for the larger, as shown belowDELETE T1 fro

Welcome to the Linux community forum, and interact with 2 million technical staff to enter the GROUPBY statement to implement deduplication query for a certain column. Directly run the preceding statement: selectio_dev_idfromio_infowhere (Tyang1) GROUPBY1; deduplication by io_dev_id. P: add it with ORDERBY and disti. Welcome to the