db sharding

Look at the 1.5.4 version of the latest 2.x version Demo View https://github.com/shardingjdbc/sharding-jdbc/blob/1.5.4/sharding-jdbc-example/ sharding-jdbc-example-jdbc-transaction/src/main/java/com/dangdang/ddframe/rdb/sharding/example/transaction/ Main.java Hard Code Required Softtransactionmanager transactionman

0. Basic idea of database shardingHorizontal slicing: Splits the table's data into multiple tables or multiple databases (servers) by some rule, such as by ID hashing. Vertical slicing: A table that is closely related (such as the same module) is sliced out and placed on a server. 1.sharding-jdbcWhen open source middleware: Https://github.com/dangdangdotcom/sharding-jdbc Note:

Label:This article will mainly introduce some common global primary key generation strategies, and then highlight a very good global primary key generation scheme used by Flickr. For the split strategy and implementation details of the sub-list (sharding), refer to the previous article in the series: Database Library sub-table (sharding) series (i) Split implementation strategy and sample demo the original

Tags: differences and implementations of sharding, partitioning, Replication (MONGOThe difference between a shard and a partition:A. Shards:解决物理磁盘空间不足的问题（如果带索引，还可以优化查询，做到分区的功能）B. Partitioning:优化查询，防止一张表中过多的数据而导致查询缓慢C. Replication:防止数据库崩溃带来的损失，保证数据库的高可用Shard implementations:A. MongoDB:shardingB. mysql:mysql-clusterPartition implementation:A. MongoDB:没有分表的概念，可以用sharding代替分表（因为

Database operation functions in the CI framework $ this-> db-> where () usage summary, this-db- This example summarizes the usage of database operation functions $ this-> db-> where () in the CI framework. We will share this with you for your reference. The details are as follows: CI framework database operation function this->

There are many unequal situations in our project. This article briefly analyzes how to optimize it.The table sharding logic here is based on the number of user_name groups in the t_group table.In this case, the index on the user_name field is a bad index. It does not have any obvious effect.1. test PROCEDURE.DELIMITER $Drop PROCEDURE't _ girl '. 'SP _ split_table' $Create PROCEDURE't _ girl '. 'SP _ split_table '()BEGINDeclare done int default 0;Decla

The table sharding logic here is based on the number of user_name groups in the t_group table.In this case, the index on the user_name field is a bad index. It does not have any obvious effect.1. test PROCEDURE.DELIMITER $Drop procedure't _ girl '. 'SP _ split_table' $Create procedure't _ girl '. 'SP _ split_table '()BEGINDeclare done int default 0;Declare v_user_name varchar (20) default '';Declare v_table_name varchar (64) default '';-- Get all user

1. Background:In discuz! In X2, the original attachment table and one attachment description table are combined and then divided into 11 tables, which greatly enhances the Forum's support for the attachment data volume, at the same time, server load is high when there are many attachment records.At the same time, a topic image table is added. If a topic's main poster is attached with an image attachment, the graph with the largest width in the attachment will be written to this table.2. Explanat

In this article, Oralce horizontal table sharding finds that tables are stored in each partition table by year based on the above horizontal table sharding. Since the data volume is still large by year after the business promotion. So we can consider whether we can split it in the year table. The following describes the splitting procedure. Original table structure (only for partitions ): From the figure a

write a general method. So I wrote the following, please kindly advise me (I am a cainiao ). I wrote two methods, one for output details, and the other for output details. You can try again .. C #: Using system;Using system. Collections. Generic;Using system. LINQ;Using system. text; Namespace consolestudy{Class sumnumberdemo{Static void main (){ Console. writeline ("sumnumberdemo ");List String restring = string. empty;Int COUNT = 0;Intlist. Add (1 );Intlist. Add (2 );Intlist. Add (5 );// Int

Brief description of fast data migration in MySQL sharding, brief description of migration in mysql Recommended: the fastest way to migrate MySQL databases across operating systems Mysql backup and Migration Data Synchronization Method Operation Background: The travelrecord table is defined as 10 shards. It tries to transfer two of the 10 shards to the second MySQL instance and complete the record. The fastest data migration method is required, and th

Please read the following tips and tell me how you feel.Currently, Jedis does not support dynamic sharding.If we add/remove an apsaradb for Redis Server from the available list, we can achieve this only by stopping the program, changing the shard configuration, and then restarting.This implementation allows a series of things, like:Adding/removing servers does not require downtimeExternal Redis connectivity detection and adjustment of Pseudo Real-Time shard ConfigurationSharding configuration fo

Mysql master/slave database, database/table sharding, and other notes bitsCN.com Mysql master/slave database, database/table sharding, and other notes 1. mysql Directory:/var/lib/mysql default directory:/usr/local/mysql during rpm or yum installation 2. MySQL installed in the rpm package will not install the/etc/my. cnf file, As to why MySQL can be started and used normally without this file, there are

If you want to implement table sharding, how are queries performed? I remember the table shards used by phpwind or dz. I don't know how these bosses query them. solution -------------------- it's not clear. #183 ;~~~~~~~~ Learning ------ solution ------------------ I don't know, I haven't studied Luo ------ solution ------------------ how can I query table sharding through http? I remember how phpwind or

MySQL table sharding optimization experiment there are many unequal situations in our project. This article briefly analyzes how to optimize it. The table sharding logic here is based on the number of user_name groups in the t_group table. In this case, the index on the user_name field is a bad index. It does not have any obvious effect. 1. test PROCEDURE. DELIMITER $Drop procedure't _ girl '. 'sp _ split_

Introduction to the principle of MYSQL table sharding (forwarding: Reference a section in the MySQL official document: the MERGE storage engine, also known as the MRG_MyISAM engine, is a set of identical MyISAM tables that can be used as one. "same" means that all tables share the same column and index information. you cannot merge the tables in which columns are not in the same sequence. tables without exactly the same columns or tables with differen

shown here:https://gist.github.com/hengyunabc/9032295Disadvantages:If you are unfamiliar with LUA scripts, it may be more cumbersome to customize your own ID rules.Note that machine time cannot be set to synchronize automatically, otherwise the ID will be duplicated due to time synchronization.Advantages:Very fast, and can be deployed linearly.You can customize your own Lua scripts to generate IDs for various businesses.Other stuff:MongoDB Objectid, this is really too long to be 12 bytes:Object

How to use thinkphp table sharding I preset 10 tables nbsp; which are nbsp; table_1, table_2, table_3 .... table_10 sets partition in the Model: protected nbsp; $ partition nbsp; = nbsp; how to use thinkphp table sharding I preset 10 tables: table_1, table_2, table_3... table_10 Partition is set in Model: Protected $ partition = array ( 'Field' => 'id ', 'Type' => 'id ', 'Exppr' => '', 'Num' => 10, );

connected to all database systems, and in tens of thousands of server-sized sites, the number of these connections is the server-scale squared Causes insufficient database connection resources to deny service.Since every application needs to perform many of the same business operations, such as user management, commodity management, and so on, these shared services can be extracted and deployed independently. These reusable business-connected databases provide shared services, while application

eventually result in a large amount of unnecessary data movement.3. SkillsEveryone wants to prove to themselves that sharding works by seeing data movement, which creates a problem: the amount of data needed to trigger a balance is much larger than most people think.For example, you are trying to shard, so you write a command line script to insert 500,000 documents into the Shard collection:for (i=0;iWhen the insert is complete, I should be able to s