- Introduction
- Quick Start
- Table Design
- Data Loading
- Overview of data loading
- Load data from a local file system or a streaming data source using HTTP push
- Load data from HDFS or cloud storage
- Routine Load
- Spark Load
- Insert Into
- Change data through loading
- Transform data at loading
- Json Loading
- Synchronize data from MySQL
- Load data by using flink-connector-starrocks
- DataX Writer
- Data Export
- Using StarRocks
- Reference
- SQL Reference
- User Account Management
- Cluster Management
- ADMIN CANCEL REPAIR
- ADMIN CHECK TABLET
- ADMIN REPAIR
- ADMIN SET CONFIG
- ADMIN SET REPLICA STATUS
- ADMIN SHOW CONFIG
- ADMIN SHOW REPLICA DISTRIBUTION
- ADMIN SHOW REPLICA STATUS
- ALTER SYSTEM
- CANCEL DECOMMISSION
- CREATE FILE
- DROP FILE
- INSTALL PLUGIN
- SHOW BACKENDS
- SHOW BROKER
- SHOW FILE
- SHOW FRONTENDS
- SHOW FULL COLUMNS
- SHOW INDEX
- SHOW PLUGINS
- SHOW TABLE STATUS
- UNINSTALL PLUGIN
- DDL
- ALTER DATABASE
- ALTER TABLE
- ALTER VIEW
- BACKUP
- CANCEL BACKUP
- CANCEL RESTORE
- CREATE DATABASE
- CREATE INDEX
- CREATE MATERIALIZED VIEW
- CREATE REPOSITORY
- CREATE RESOURCE
- CREATE TABLE AS SELECT
- CREATE TABLE LIKE
- CREATE TABLE
- CREATE VIEW
- CREATE FUNCTION
- DROP DATABASE
- DROP INDEX
- DROP MATERIALIZED VIEW
- DROP REPOSITORY
- DROP RESOURCE
- DROP TABLE
- DROP VIEW
- DROP FUNCTION
- HLL
- RECOVER
- RESTORE
- SHOW RESOURCES
- SHOW FUNCTION
- TRUNCATE TABLE
- DML
- ALTER ROUTINE LOAD
- BROKER LOAD
- CANCEL LOAD
- DELETE
- EXPORT
- GROUP BY
- INSERT
- PAUSE ROUTINE LOAD
- RESUME ROUTINE LOAD
- ROUTINE LOAD
- SELECT
- SHOW ALTER
- SHOW BACKUP
- SHOW DATA
- SHOW DATABASES
- SHOW DELETE
- SHOW DYNAMIC PARTITION TABLES
- SHOW EXPORT
- SHOW LOAD
- SHOW PARTITIONS
- SHOW PROPERTY
- SHOW REPOSITORIES
- SHOW RESTORE
- SHOW ROUTINE LOAD
- SHOW ROUTINE LOAD TASK
- SHOW SNAPSHOT
- SHOW TABLES
- SHOW TABLET
- SHOW TRANSACTION
- SPARK LOAD
- STOP ROUTINE LOAD
- STREAM LOAD
- Data Types
- Auxiliary Commands
- Function Reference
- Java UDFs
- Window Function
- Date Functions
- convert_tz
- curdate
- current_timestamp
- curtime
- datediff
- date_add
- date_format
- date_sub
- date_trunc
- day
- dayname
- dayofmonth
- dayofweek
- dayofyear
- from_days
- from_unixtime
- hour
- minute
- month
- monthname
- now
- quarter
- second
- str_to_date
- timediff
- timestampadd
- timestampdiff
- to_date
- to_days
- unix_timestamp
- utc_timestamp
- weekofyear
- year
- hours_diff
- minutes_diff
- months_diff
- seconds_diff
- weeks_diff
- years_diff
- Aggregate Functions
- Geographic Functions
- String Functions
- JSON Functions
- Overview of JSON functions and operators
- JSON constructor functions
- JSON query and processing functions
- JSON operators
- Aggregate Functions
- Bitmap Functions
- Array Functions
- cast function
- hash function
- Cryptographic Functions
- Math Functions
- Utility Functions
- System variables
- Error code
- System limits
- SQL Reference
- Administration
- FAQ
- Deploy
- Data Migration
- SQL
- Other FAQs
- Benchmark
- Developers
- Contribute to StarRocks
- Code Style Guides
- Use the debuginfo file for debugging
- Development Environment
- Trace Tools
System limits
This topic describes the rules and limits that apply when you use StarRocks.
StarRocks uses the MySQL protocol for communication. You can connect to the StarRocks cluster via a MySQL client or JDBC. We recommend that you use a MySQL client whose version is 5.1 or later. Versions earlier than 5.1 do not support usernames that are longer than 16 characters.
Naming conventions for clusters, databases, tables, views, columns, partitions, usernames, and roles:
- The names can only consist of digits (0-9), letters (a-z or A-Z), and underscores (_).
- The name cannot exceed 64 characters in length.
- Except for column names, other names must start with a lowercase or uppercase letter.
- Column names can start with an underscore (_).
- Database, table, and view names are case-sensitive. Column names are not case-sensitive.
Naming conventions for labels: You can specify the label of a job when you import data. The label name can consist of underscores (_), letters (a-z or A-Z), and digits (0-9), and cannot exceed 128 characters in length. The label name has no requirement for the starting character.
When you create a table, the key column cannot be of the FLOAT or DOUBLE type. You can use the DECIMAL type to represent decimals.
A VARCHAR value can be up to 65533 bytes (two bytes less than 65535 because the first two bytes are used to indicate the length).
StarRocks supports only UTF8 encoding, not GBK.
StarRocks does not support modifying column names in tables.
By default, an expression can have a maximum of 10,000 children, which can be modified by using
expr_child_limit
in thefe.conf
file.