table of Contents
The principle of vertical split
How to divide the data equally into N shares
Vertical split
What is vertical split
The so-called vertical split is to split a table with many columns into multiple tables, which solves the problem of table width.
The principle of vertical split
1. Store the uncommonly used field tables in a single table.
2. Store large fields independently in a table.
3. Put together the fields that are often used together.
Horizontal split
What is horizontal split
The horizontal split of the table is to solve the problem of too much data in a single table. The structure of each table of the horizontal split table is completely consistent.
How to divide the data equally into N shares
1. Hash the customer_id. If you want to split it into 5 tables, use mod (customer_id, 5) to retrieve 0-4 values.
2. Store data in different tables for immovable hasid.
