deduplication

PHP programming quick array de-duplication method explanation, php programming array explanation This example describes how to quickly implement array deduplication using PHP programming. We will share this with you for your reference. The details are as follows: Overview PHParray_unique()The function allows you to pass an array, remove duplicate values, and return an array with unique values. This function works well in most cases. However, if you tr

Program flow and C code implementation for removing repeated rows from source files I. Requirement DescriptionDeduplication is required for a file (source file) that contains several lines of records with the same records, and records after deduplication are written to another file (target file). That is, there are no two rows of records with the same content in the last generated file. If there is a blank line between two records in the source file,

. Refs can accommodate SSD caches, but there are not many features about refs caching, although they do not support DRAM caching.In contrast, the ZFS cache is well documented, and the DRAM cache is a core feature. ZFS provides three levels of caching: ARC, which is the smart memory cache to RAM, and uses as much available RAM as possible; L2arc, this is a one-time (non-storage) SSD read cache, and Zil, which is SSD write cache, buffers write to the underlying volume.Location of arc in the entire

Absrtact: The MapReduce program carries out data deduplication. Keywords: MapReduce data deduplication Data source: Manually constructs log datasets Log-file1.txt and Log-file2.txt. Log-file1.txt Content 2014-1-1 wangluqing 2014-1-2 Root 2014-1-3 Root 2014-1-4 wangluqing 2014-1-5 Root 2014-1-6 wangluqing Log-file2.txt Content 2014-1-1 Root 2014-1-2 Root 2014-1-3 wangluqing 2014-1-4 wangluqing 2014-1-5 wangl

This article describes how php performs operations on two-dimensional arrays, including sorting, transforming, removing spaces, and deduplication of two-dimensional arrays by php. For more information, see This article describes how php performs operations on two-dimensional arrays, including sorting, transforming, removing spaces, and deduplication of two-dimensional arrays by php. For more information, se

Nijino. cnblog20140105nsarray-skills I previously talked about how to remove repetitive elements in NSArray in Netease's technology blog. I recently watched the WWDC2013 video and found that Apple engineers have a simpler method for Array deduplication. There is also a simple method for reverse sorting of arrays, so I can quickly record them for backup. NSArray Inverse I talked about how to remove repetitive elements in NSArray in Netease's technology

The deduplication technology can provide a larger backup capacity, ensure data retention for a longer period of time, and achieve continuous verification of backup data, improve the level of data recovery service, and facilitate the implementation The deduplication technology can provide a larger backup capacity, ensure data retention for a longer period of time, and achieve continuous verification of backu

Does mysql deduplicate a field and display other field information? Recently, it was required that the deduplication function be performed based on the values of a column in the SQL statement, and information about other fields should be displayed. selectdistinctname and sorcefromtable are used, and the result shows that deduplication does not work, because MYSQL considers that sorce and name must be repeat

array element can also be another array. Tree structure and multi-dimensional array are also allowed. In the php array, the key (keys) is also called an index and is unique. we can use this feature for weight sorting. the sample code is as follows: The code is as follows: // Define an array to store the results after deduplication$ Result = array ();// Read the uid list file$ Fp = fopen('test.txt ', 'r ');While (! Feof ($ fp )){$ Uid = fgets ($

data deduplication is mainly to grasp and use the idea of parallelism to make a meaningful selection of data. The seemingly complex task of counting the number of data on a large data set, and computing access from the site log, involves data deduplication. Here is the MapReduce program that goes into this example. Package com.hadoop.mr;Import java.io.IOException;Import org.apache.hadoop.conf.Configuration;

data according to the sequence defined by the current character set (locale. For example, in the traditional C looal. The sort command is sorted in ASCII order. to change the sorting rules, you can modify the current character set. [Houchangren @ ebsdi-23260-oozie data] $ catfruits.txt // view file content apple % contents [houchangren @ ebsdi-23260-oozie data] $ sortfruits.txt/default sort appleapple % contents [houchangren @ ebsdi-23260-oozie data] $ echo $ LANG // view default set character

latest NetVault backup software and dr6000 deduplication device. With NetVault backup, the performance of dr6000 becomes more powerful, which is the best example of software and hardware integration. In the past few years, Dell has acquired a series of data protection software vendors, making it more autonomous and easy to provide comprehensive data protection solutions. 　Makeup for mergers and acquisitions In the field of data protection, providing

Mysql deletes redundant duplicate records. Sometimes, multiple duplicate records exist in the database. In this case, deduplication is required, that is, only one record is retained... This is especially common in Data Warehouses because of human or even negligence. How to remove duplicates? The procedure is as follows: 1. query duplicate records? CREATETABLEpush_log_fu Mysql deletes redundant duplicate records. Sometimes, multiple duplicate records e

the newURLDownload the corresponding webpage.The sub-modules of the crawler system are located in this loop and complete a specific function. These sub-modules generally include: Fetcher: used to download the corresponding webpage based on the URL; DNS resolver: DNS resolution; Content seen: deduplication of webpage content; Extractor: extract the URL or other content from the webpage; Url filter: filters out URLs that do not need to be downloaded; U

I/O during write-intensive operations. This can be seen as a database scenario in which the content of a large disk may have exceeded the power of the drive controller and used the disk to maintain the condition. This buffer can eliminate any pauses caused by the overwhelmed storage subsystem.Data deduplication Technology (deduplication on running VMs)Data removal technology is a good new feature in Window

number LUN management. Therefore, in terms of logic, NAS is a simpler network storage than local network SAN. If there are dozens of Virtual Machine VMS in the system), technically speaking, write the Virtual Machine File System (VMFS) to SAN storage, it is very helpful to integrate all vmdks into a single LUN. However, if the system has thousands of virtual machines, nas nfs is a more efficient network storage method. For example, NAS allows you to group similar VMDK files into different folde

array, the key (keys) is also called an index and is unique. we can use this feature for weight sorting. the sample code is as follows: The code is as follows: // Define an array to store the results after deduplication $ Result = array (); // Read the uid list file $ Fp = fopen('test.txt ', 'r '); While (! Feof ($ fp )) { $ Uid = fgets ($ fp ); $ Uid = trim ($ uid ); $ Uid = trim ($ uid, "\ r "); $ Uid = trim ($ uid, "\ n "); If ($ uid = '') {

($tempValueList as $_value) { $pos = strpos($_value, '~'); $_key = substr($_value, 0, $pos); $_val = substr($_value, $pos + 1); if ($key == $_key) { continue; } if ($_val == $value) { $result = false; break 3; } } } } return $result;} Look, the two answers are useless. LZ is really

This article describes how to improve the efficiency of element search and de-duplication in PHP arrays, this article compares the execution speed of the related methods to summarize the methods for making element search and deduplication more efficient in the array. For more information, see Improves the efficiency of searching array elements1. php in_array method description Php searches for the existence of array elements. the in_array method is g

This article describes how to improve the efficiency of element search and de-duplication in PHP arrays, this article compares the execution speed of the related methods to summarize the methods for making element search and deduplication more efficient in the array. For more information, see Improves the efficiency of searching array elements1. php in_array method description Php searches for the existence of array elements. the in_array method is g