Limits

Last Updated: Sep 30, 2017

Item Restriction Description
Number of instances saved under an Alibaba Cloud user account Up to 10 If you want to raise the limit, open a ticket.
Number of tables in an instance Up to 64 If you want to raise the limit, open a ticket.
Instance name length 3-16 Bytes Can contain uppercase and lowercase letters, digits, and hyphens. Must begin with a letter, and must not end with a hyphen.
Table name length 1-255 Bytes Can contain uppercase and lowercase letters, digits, and underscores, and must begin with a letter or underscore.
Column name length 1-255 Bytes Can contain uppercase and lowercase letters, digits, and underscores, and must begin with a letter or underscore.
Number of Primary Key columns 1-4 There must be at least one column.
Size of String type Primary Key column values Up to 1 KB A single Primary Key column’s String type column value is limited to 1 KB.
Size of String type attribute column values Up to 2 MB A single attribute column’s String type column value is limited to 2 MB.
Size of Binary type Primary Key column values Up to 1 KB A single Primary Key column’s Binary type column value is limited to 1 KB.
Size of Binary type attribute column values Up to 2 MB A single attribute column’s Binary type column value is limited to 2 MB.
Number of attribute columns in a single row Unlimited A single row can contain an unlimited amount of attribute columns.
Data size of a single row Unlimited The total size of all column names, and column value data, for a single row is unlimited.
Reserved read/write throughput for a single table Up to 5000 If you want to raise the limit, open a ticket.
Number of columns in a read request’s columns_to_get parameter Up to 128 The maximum number of columns obtained in a row of data in the read request.
Table-level operation QPS 10 The QPS of a table-level operation on an instance must not exceed 10. For table-level operations, see Table operations.
Number of UpdateTable operations for a single table Raise: Unlimited
Lower: Unlimited
The reserved read/write throughput for each table can be raised or lowered unlimited times within a calendar day (from 00:00:00 to 00:00:00 of the next day in UTC time).
UpdateTable frequency for a single table Maximum of one update every 2 minutes The reserved read/write throughput for a single table cannot be adjusted beyond the frequency of once every 2 minutes.
The number of rows read by one BatchGetRow request Up to 100 N/A
The number of rows written by one BatchWriteRow request Up to 200 N/A
Data size of one BatchWriteRow request Up to 4 MB N/A
Data returned by one GetRange operation Up to 5000 rows or 4 MB The data returned by a single operation cannot exceed 5000 rows or 4 MB. Otherwise, you must read the excessive data with a returned token.
The data size of an HTTP Request Body Up to 5 MB N/A
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