MongoDB Background and specifics ,
also I provide how to use Mongod Security .
and Basic MongoDB operation by pymongo
我這份文件有介紹MONGODB的特性及限制,Sharding 及 Replicate 的觀悠,Security怎麼作,怎麼用
The document provides information about understanding query execution in MySQL. It discusses using EXPLAIN to view and analyze the query execution plan chosen by the MySQL query optimizer. It describes different access types like ALL, index, range, and ref that may be displayed in the EXPLAIN output and how to optimize queries to avoid inefficient access types like ALL. Indexes are important for performance, and the type of indexes available can impact the strategy chosen.
This document discusses MySQL Sandbox, a toolkit created by Giuseppe Maxia to make it easier for developers to install and manage multiple MySQL servers for testing purposes without having to do repetitive manual configuration. As a lazy developer, Maxia wrote 12,000 lines of Perl code to create MySQL Sandbox, which can install and configure single or replicated MySQL sandboxes within seconds using simple commands, saving himself and others significant time and effort compared to manual processes. The toolkit demonstrates how a developer can leverage programming to reduce their workload and make common tasks more efficient.
MongoDB Background and specifics ,
also I provide how to use Mongod Security .
and Basic MongoDB operation by pymongo
我這份文件有介紹MONGODB的特性及限制,Sharding 及 Replicate 的觀悠,Security怎麼作,怎麼用
The document provides information about understanding query execution in MySQL. It discusses using EXPLAIN to view and analyze the query execution plan chosen by the MySQL query optimizer. It describes different access types like ALL, index, range, and ref that may be displayed in the EXPLAIN output and how to optimize queries to avoid inefficient access types like ALL. Indexes are important for performance, and the type of indexes available can impact the strategy chosen.
This document discusses MySQL Sandbox, a toolkit created by Giuseppe Maxia to make it easier for developers to install and manage multiple MySQL servers for testing purposes without having to do repetitive manual configuration. As a lazy developer, Maxia wrote 12,000 lines of Perl code to create MySQL Sandbox, which can install and configure single or replicated MySQL sandboxes within seconds using simple commands, saving himself and others significant time and effort compared to manual processes. The toolkit demonstrates how a developer can leverage programming to reduce their workload and make common tasks more efficient.
The document discusses various topics related to Vim including Vim on Windows, vimrc configuration files, Vim commands, plugins, and Vim hacks. It provides instructions for installing Vundle and cloning Vim plugins from GitHub. It also includes mappings for quickly opening vimrc files and reloading configuration.
MySQL 5.6 introduces several new query optimization features over MySQL 5.5, including:
1) Filesort optimization for queries with a filesort but a short LIMIT, improving performance over 2x in one example.
2) Index Condition Pushdown which pushes conditions from the WHERE clause into the index tree evaluation, improving a query over 5x faster by reducing the number of rows accessed.
3) Other optimizations like Multi-Range Read which improve performance of queries that access multiple ranges or indexes in a single query. The document provides examples comparing execution plans and performance between MySQL 5.5 and 5.6 to demonstrate the benefits of the new optimization features.
Just about anyone can write a basic SQL query for a table. Not everyone can write a good query though - that takes practice and knowing how to understand what the optimizer is doing with the query. Learn the basics of query optimization so you keep your application engaging the user rather then showing the progress bar as they wait on the database.
The document discusses Ethernet technologies and concepts. It covers the basic Ethernet frame format, which includes fields for preamble, start-of-frame delimiter, destination address, source address, length/type, data, and frame check sequence. It also describes half-duplex frame transmission using CSMA/CD (carrier sense multiple access with collision detection) and the process stations follow to transmit frames and handle collisions. Additionally, it provides background on the development of Ethernet standards and the logical relationship between Ethernet and the OSI reference model.
MySQL 5.6 GA版本已经发布了,其中包含了大量的新特性,了解这些新特性,不仅对数据库内核研发有帮助,对于更好的使用MySQL数据库也有着极大的意义。本分享将深入剖析MySQL 5.6新特性的实现细节,一共分为两期:分别是InnoDB引擎以及MySQL Server。本次为第一期,分享 MySQL 5.6 InnoDB引擎中的性能优化与功能增强。
1. What web caching means and includes
2. Why use caching
3. File caching
4. Share caching
5. Local caching
6. Memcached and its usage
7. TTServer and KTServer
8. Redis VS SSDB
9. CDN cachings
10. Twemproxy
11. Programming skills and tips
3. Redis 是什么
● Redis 是 REmote DIctionary Server 的缩写 .
● Redis is an open source, advanced key-
value store. It is often referred to as a
data structure server since keys can
contain strings, hashes, lists, sets and
sorted sets.