Identifier length limits
| Item | Maximum length |
|---|---|
| Cluster name | 128 bytes |
| Tenant name | 64 bytes |
| Username | 64 bytes |
| Database name | 128 bytes |
| Table name | 64 bytes |
| Column name | 128 bytes |
| Index name | 64 bytes |
| View name | 64 bytes |
| Alias | 255 bytes |
| Table group name | 128 bytes |
Maximum OBProxy connections
| Item | Upper limit |
|---|---|
| Number of connections per OBProxy | You can specify the client_max_connections parameter of an OBProxy to specify the maximum number of connections of the OBProxy. The default value is 8192.Note |
Maximum number of partition replicas
| Item | Upper limit |
|---|---|
| Number of partition replicas per OBServer | No upper limit.
Note: |
Single-table limits
| Item | Upper limit |
|---|---|
| Row length | 1.5 MB |
| Number of columns | 4,096 |
| Number of indexes | 128 |
| Total number of index columns | 512 |
| Index length | 1.5 MB |
| Total number of primary key columns | 64 |
| Primary key length | 16 KB |
| Number of partitions | 8192 |
Single-column limits
| Item | Upper limit |
|---|---|
| Length of an index column | 262,143 bytes |
String type limits
| Type | Maximum length |
|---|---|
CHAR |
255 bytes |
VARCHAR |
65,535 bytes |
BINARY |
255 bytes |
VARBINARY |
65,535 bytes |
BLOB |
65,535 bytes |
TEXT |
65,535 bytes |