TiDB usage restrictions

1. Identifier length limit

Identifier type	Maximum length (characters)
Database	64
Table	64
Cloumn	64
Index	64
View	64
Sequence	64

2. Limit on the total number of Databases, Tables, Views, Connections

Identifier type	Maximum number
Databases	unlimited
Tables	unlimited
Views	unlimited
Connections	unlimited

Three, the limitations of a single database

Types of	Maximum limit
Tables	unlimited

Fourth, the limitations of a single Table

Types of	Maximum limit
Cloumns	512
Indexs	64
Rows	unlimited
Size	unlimited
Partitions	1024

Five, single line restrictions

Types of	Maximum limit
Size	6MB

Six, single column restrictions

Types of	Maximum limit
Size	6MB

Seven, string type restrictions

Types of	Maximum limit
CHAR	256 characters
BINARY	256 bytes
VARBINARY	65535 bytes
VARCHAR	16383 characters
TEXT	6MB bytes
BLOB	6MB bytes

8. Limitations of SQL Statements

Types of	Maximum limit
Maximum number of statements in a single transaction	In the case of optimistic transactions and open transactions be retried, the default limit of 5000, by stmt-count-limitadjusting the