unconventional reservoirs

Algorithm Description :Reservoir sampling is a series of random algorithms that are designed to select K samples from the set S of n items (from s[n] to select Samples S (k)), where n is a large or unknown quantity, especially for cases where all n items cannot be stored in the main memory.Solution:1. Extract the first k items from s[n] into "pond" for each s[j] item (j≥k): for (int i=0;iSampling of reservoirs

Recently, many personal webmaster have responded to the Ministry of Information Industry's call, actively for their own website for the record. However, a lot of personal webmaster record application again as if nothing, no movement. Not only that, through the audit, but can not download the record certificate, Space business on behalf of the record of the site to download certificates and other unconventional issues (very sexual problems are mainly t

As we all know, in the process of website optimization, there are a few basic optimization strategies and key points are all of us insist on doing things, such as the site keyword density of the grasp, the site structure adjustment, the construction of content, the construction of the seoer and so on these are our daily work in the day-to-day operation of things, Today I want to put aside these aspects with more in line with the search engine thinking to optimize Baidu rankings also need those s

Oracle Databases perform unconventional recoveries through Oracle Dul after truncate deletion of a table of data in the absence of a backup1. Preparing the Oracle Dul test EnvironmentSql> Select COUNT (*) from T_xifenfei; COUNT (*)----------67854sql> desc T_xifenfei Name Null? Type-----------------------------------------------------------------------------OWNER VARCHA

This is an unconventional network security detection, or network security investigation. 　　I. Reasons: A few days ago, a friend said that a database server in their unit seemed to be hacked and left a message "*** here!" on the desktop !". I rushed over and checked the database server system comprehensively. This host is a Windows XP system and has no SP2 patch package. I was surprised by the results: 1. There are two administrator users in the system

Environment first: AIx 7.1 Oracle/ASM 11.2.0.3 Single Instance In this test environment, the flashdg size in ASM needs to be increased to 35 GB (currently 10 Gb). diskgroup is created based on the LV divided in RAW mode in VG. Because only the AIX administrator is notified in the test environment, the AIX administrator increases the number of PP of fsflashdglv through Smit LV. After adding the number, you can see that the LV is increased, but the flashdg1 is not increased. The entire process is

Unconventional solution to AngularJS module Management Problems This article mainly introduces the unconventional management methods for AngularJS module management. It is a helpless action. I will share it with my friends for your reference. 1. Cause I have been doing winform myself, and I am lucky to have a node in my hand. js, express, and angularJS collect a large number of open-source framework project

Tags: report development, statistical grouping, grouped by segment, Set Computing report During report development, some reports that require unconventional statistics, such as fixed groups, repeatable groups, and group sorting, also include reports computed across row groups, even some reports do not have data sources and need to be computed on the data sources. These reports have some special characteristics and are often difficult to implement us

Recently, many personal webmaster have responded to the Ministry of Information Industry's call, actively for their own website for the record. However, a lot of personal webmaster record application again as if nothing, no movement. Not only that, through the audit, but can not download the record certificate, Space business on behalf of the record of the site to download certificates and other unconventional issues (very sexual problems are mainly t

If the data in the MySQL production database on the line is mistakenly deleted, and the DBA goes to recover the data, it is discovered that the database is not backed up, Binlog, or open. Is there any other means to try to recover the data? Percona Company provides an unconventional repair tool that can be used to repair table data. Of course, this tool is limited:1, only for the InnoDB engine table 2, the table Row_format must be redundant or compact

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------------------------------------------------------------------------oracleplus_0000 /dev/ Asm-disk3 memberdata_0000 /dev/asm-disk1 memberdata_0001 /dev/asm-disk2 MEMBERTest Recovery Disk GroupSql> Startup ORACLE instance started. Total System Global area 952020992 bytesfixed size 2258960 bytesvariable size 306186224 bytesdatabase Buffers 63753420

For websites, traffic is the pursuit, but for webmasters, server speed is fundamental. No Webmaster can tolerate server slowdown. As a server maintainer, I am very anxious when the server slows down. From the two recent attempts to solve server slowdown problems, it is sometimes difficult to think that server slowdown will be caused by these reasons. I hope you will think of this idea when your server slows down one day! Server slowdown unconventional