MaxCompute:MaxCompute SQL limits

Item

Maximum value/Limit

Category

Description

Table name length

128 bytes

Length

A table or column name can contain only letters, digits, and underscores (_). It must start with a letter. Special characters are not supported.

Comment length

1,024 bytes

Length

A comment is a valid string that cannot exceed 1,024 bytes in length.

Column definitions in a table

1,200

Quantity

A table can contain a maximum of 1,200 column definitions.

Partitions in a table

60,000

Quantity

A table can contain a maximum of 60,000 partitions.

Partition levels of a table

6

Quantity

A table can contain a maximum of six levels of partitions.

Output display

10,000 rows

Quantity

A SELECT statement can return a maximum of 10,000 rows.

Number of destination tables for INSERT operations

256

Quantity

A MULTI-INSERT statement allows you to insert data into a maximum of 256 tables at the same time.

UNION ALL

256

Quantity

The UNION ALL statement allows you to combine a maximum of 256 tables.

MAPJOIN

128

Quantity

A MAPJOIN hint allows you to join a maximum of 128 small tables.

MAPJOIN memory

512 MB

Quantity

The memory size for all small tables cannot exceed 512 MB when you specify a MAPJOIN hint in SQL statements.

ptinsubq

1,000 rows

Quantity

A PT IN SUBQUERY statement can generate a maximum of 1,000 rows.

Length of an SQL statement

2 MB

Length

An SQL statement cannot exceed 2 MB in length. This limit is suitable for the scenarios in which you use an SDK to execute SQL statements.

Length of a column record

8 MB

Quantity

The maximum length of a column record in a table is 8 MB.

Parameters in an IN clause

1,024

Quantity

This item specifies the maximum number of parameters in an IN clause, such as in (1,2,3....,1024). If the number of parameters in an IN clause is excessively large, the compilation performance is adversely affected. We recommend that you use a maximum of 1,024 parameters, but this is not a fixed upper limit.

jobconf.json

1 MB

Length

The maximum size of the jobconf.json file is 1 MB. If a table contains a large number of partitions, the size of the jobconf.json file may exceed 1 MB.

View

Not writable

Operation

A view is not writable and does not support the INSERT statements.

Data type and position of a column

Unmodifiable

Operation

The data type and position of a column cannot be modified.

Java user-defined functions (UDFs)

Not allowed to be abstract or static

Operation

Java UDFs cannot be abstract or static.

Partitions that can be queried

10,000

Quantity

A maximum of 10,000 partitions can be queried.

SQL execution plans

1 MB

Length

The size of an execution plan that is generated by using MaxCompute SQL statements cannot exceed 1 MB. Otherwise, the error message FAILED: ODPS-0010000:System internal error - The Size of Plan is too large is reported.

Maximum execution duration of a single job

72 hours

Execution duration

The default maximum execution duration of a single SQL job is 24 hours. You can use the following parameter setting to run a single SQL job for up to 72 hours. An SQL job cannot run for more than 72 hours. If an SQL job runs for 72 hours, the job is automatically stopped.

set odps.sql.job.max.time.hours=72;