Amazon SimpleDB Limits

Following is a table that describes current limits wihin Amazon SimpleDB.

Parameter Restriction
Domain size 10 GB per domain
Domain size 250,000,000 attribute name-value pairs
Domain name 3-255 characters (a-z, A-Z, 0-9, '_', '-', and '.')
Domains per account 100
Attribute name-value pairs per item 256
Attribute name length 1024 bytes
Attribute value length 1024 bytes
Item name length 1024 bytes
Attribute name, attribute value, and item name allowed characters All UTF-8 characters that are valid in XML documents. Control characters and any sequences that are not valid in XML are not allowed.
Attributes per PutAttributes operation 100
Maximum items in query response 250
Maximum query execution time 5 seconds
Maximum comparisons per predicate 10
Maximum predicates per query expression 10
Maximum response size for QueryWithAttributes 1MB