more random

A disk physical structure(1) Disc: The disk body of the hard drive is composed of several platters stacked together.When the hard drive is factory, the hard disk manufacturer completes the low-level format (physical format), the role is to divide

Use tamper script in Sqlmap to bypass WAF script name: 0x2char.pyfunction: Replace the apostrophe character with the UTF-8 full-width corresponding characterFunction: With equivalent concat (CHAR (), ... Corresponds to replacing each (MySQL) 0x

Five basic Types Key (keys) Common commands: Keys * Check the name of all keys exists keys in the current library to determine if a key exists. A return of 1 indicates that there is, and 0 means not present. move key (that key) db (which library,

#======================================================##MySQL Association query algorithm:BNL (Block nested-loop)ICP (Index Condition pushdown)MRR (Multi-range Read)BKA (batched Key

Recently in the forum to see someone asked, how to quickly generate 1 million non-repeating 8-digit number, for this issue, there are a few things to note: 1. How to generate a 8-bit random number, the more random the generated number, the more

MySQL versionAlfa-Beta->gaGA represents production environment useMySQL Limitations1, do not complex transaction support, RR level, auxiliary next-key lock, you can meet the requirements of high consistency;2, really need materialized view, can

Accidentally saw "fotolog:scaling the world\ 's largest Photo Blogging Community", only to find a lot of database optimization truth is very simple, to high level is when you face the problem, whether really made their own thinking, And not just the

In the database optimization, we see some of the tables are designed to use text or BLOB fields, if the single table storage space reached nearly hundred g or dozens of G, this situation again to change and optimization is very difficultFirst,

The main content of this article comes from MongoDB Official document Http://docs.mongodb.org/manual/administration/production-notes/. and combined with the actual work of the situation to share.1) Selection of packagesBe sure to use the latest

In the database optimization, we see some of the tables are designed to use text or BLOB fields, if the single table storage space reached nearly hundred g or dozens of G, this situation again to change and optimization is very difficultFirst,

This article goes on to the above four articles to continue to describe the Shard cluster construction under the window platform MongoDB. Indexes can also be created in a shard cluster in the same way that indexes are created in a separate database.

The first two chapters of this series have described the system architecture and the underlying memory mapping of the system build, which describes in detail the core of Lmdb, external memory b+tree operations. This paper describes the usage of

public void Create (string mdbpath){if (file.exists (Mdbpath))//check if the database already exists{throw new Exception ("The target database already exists and cannot be created");}You can add a password so that the created database must enter a

Sstable is a critical piece of bigtable, and for leveldb, understanding the Sstable implementation details of LEVELDB also helps to understand some of the implementation details in BigTable.This section focuses on the static layout structure of

MySQL as a common database, in the Internet system applications a lot. Some faults are their own bugs, others are not, examples of problems encountered in the previous period.ProblemThe symptoms that were encountered were this, our application

this week began the automated testing of mobile input method Simeiji, while beginning to touch mobile browser automation testing. The next step is to do a monographic study of the Android automated test tools and methods. The first article

Monkey testing the use of 1--monkeyOriginal address:http://www.douban.com/note/257029872/(Transferred from watercress, copyright belongs to watercress and Douban friends, if offended please forgive and contact us)Use of MonkeyFirst, what is

The mysterious situation of Linux page table isolation patch Errata and supplement in this article Long message warning:This is a strictly restricted security bug that is not allowed to be disclosed (LCTT Note: it has been partially disclosed). It

Reprint please specify the original address: http://www.cnblogs.com/ygj0930/p/5827547.html the most effective way to solve the parallel conflict is to add the synchronous lock, mainly have the following methods: 1: Dynamic method Synchronous Lock:

Recently heard that the data structure and algorithm practice teacher again out of the same topic as the previous year, can not help but think of the last time I finished homework when the point drops, regret at that time did not write the habit of