data deduplication

Recently, in a project, repeated data needs to be removed, which was previously implemented in the background. Now the customer needs to de-duplicate data in the foreground, so he thought of javascript scripts. Project requirements: Code: The Code is as follows:

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 t

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

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 sy

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

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 duplica

1. What is deduplication?Simply put, when data is transmitted or stored over the network, multiple identical copies are not transmitted or stored.Data to reduce the occupation of network bandwidth and storage space. In fact, the previous SIS (single-instance storage) is a dedu technology, but its de-duplication unit is file. Currently popularThe deduplication tec

result is: SELECT * FROM (SELECT ROW_NUMBER () OVER (partition by Name order by id) AS RowId, * FROM dbo. userInfo) x, for example: 　　 Now we can see that if no condition is added, all data will be identified, so the data with RowId = 1 is the de-duplicated data; In addition to deduplication, ROW_NUMBER () can get the

What should you do if the recovery data grows too large and traditional disaster recovery methods cannot achieve the goal? Some new technologies, such as deduplication, storage Tiering, and data management policies, can help you reduce the high cost of disaster recovery, at the same time, it can also achieve the expected recovery time objective (rediscovery time

definition in this article: eliminates redundant data blocks by creating smaller-size pointers to reference an already stored data block that has identical content.It is mentioned that the data blocks of Virtual Machine images of different versions of the same Linux distribution (Linux distribution) are highly repetitive. 2. Introduce de-duplication to virtual

recommended. Some people may say that the first and third types are not repeated every time? Is it about the same as 5th? Yes, you can understand it. It means that you understand it, but it is not a special understanding. If we say it is almost the same, it will be much worse, indexOf () it indicates that when the first matching element is found Stop traversal, and the 5th types will traverse the entire array no matter whether it is not found. If there is a large amount of

VNX data block deduplication can be enabled on each Pool.1. To enable deduplication for a traditional RAID group LUN, you must first migrate it to the storage pool ).2. Once deduplication is enabled, the LUN will be migrated to the deduplication container. After the migratio

To ensure the arrival rate of information request messages, the server will send the same request message (RequestMessage) multiple times without receiving the response message in time ), all text content, including MsgId, is consistent. To ensure the arrival rate of information request messages, the server will send the same request message (RequestMessage) multiple times without receiving the response message in time ), all text content, including MsgId, is consistent. This mechanism ensures

This article summarizes four methods of array deduplication in javascript, which are loop matching deduplication, JSON deduplication object deduplication dictionary deduplication, and queue recursive deduplication, the INDEXOF

During project development, arrays often contain a lot of repeated content, that is, dirty data removal operations. This article focuses on several methods of array deduplication. For more information, see. 1.According to the principle that keys in js objects are not repeated, the method of removing duplicates from arrays is conceived. The most common thinking is as follows: The Code is as follows: Functi

Three methods and code examples for removing the deduplication of JavaScript Arrays This article mainly introduces three methods and code examples for de-duplicating JavaScript arrays. This article provides the instance Code directly. For more information, see There are many methods to deduplicate arrays. it is unclear which one is the best. So I tested the effect and performance of array deduplication. Tes

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 Linux community forum and interact with 2 million technical staff> enter the