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Limits

Last Updated: May 14, 2018
Item Limit Description
Number of instances created under an Alibaba Cloud user account Up to 10 instances To raise the limit, open a ticket.
Number of tables in an instance Up to 64 tables 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. Must not contain the words, such as ‘ali’, ‘ay’, ‘ots’, ‘taobao’and ‘admin’.
Table name length 1-255 Bytes Can contain uppercase and lowercase letters, digits, and underscores. Must begin with a letter or underscore.
Column name length 1-255 Bytes Can contain uppercase and lowercase letters, digits, and underscores. Must begin with a letter or underscore.
Number of primary key columns 1-4 columns 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.
The number of attribute columns written by one request Up to 1024 columns The number of attribute columns written by one PutRow, UpdateRow, or BatchWriteRow request in a single row.
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 To raise the limit, open a ticket.
Number of columns in a read request’s columns_to_get parameter Up to 128 columns 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 rows N/A
The number of rows written by one BatchWriteRow request Up to 200 rows 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, the excessive data will be read with a returned token.
The data size of an HTTP Request Body Up to 5 MB N/A
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