Under what circumstances should we consider sub database and sub table

1. Only when the number of database connections is insufficient , Adopt the way of sub database to improve the bottleneck of database performance
2. Only when the amount of data stored in a single table exceeds 500w Or the size of a single table exceeds 2G When , Adopt the form of sub table to improve the bottleneck of table reading and writing

When the above two situations occur at the same time , That is, when we need to consider the sub database and sub table .

In the business scenario , We need to consider the sub database and sub table in advance , Like the future 3 During the year , If this happens to your watch , We should do a good job of dividing the database and table as soon as possible .