Exam AWS Certified Database - Specialty topic 1 question 134 discussion

C. Answer

Answer C. The error happens OCCCASIONALLY. So you need to wait for the table creation to complete.

C. Change the application to call DescribeTable periodically until the TableStatus is ACTIVE, then call PutItem. https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeTable.html "ResourceNotFoundException The operation tried to access a nonexistent table or index. The resource might not be specified correctly, or its status might not be ACTIVE."

DynamoDB responds with this error when you're trying to run an operation against non-existent or not active table.

ConditionExpression A condition that must be satisfied in order for a conditional PutItem operation to succeed. An expression can contain any of the following: Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size These function names are case-sensitive. Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN Logical operators: AND | OR | NOT

D. answer. ConditionExpression A condition that must be satisfied in order for a conditional PutItem operation to succeed. An expression can contain any of the following: Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size These function names are case-sensitive. Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN Logical operators: AND | OR | NOT

The answer is C.

Answer is C. ResourceNotFoundException The operation tried to access a nonexistent table or index. The resource might not be specified correctly, or its status might not be ACTIVE. https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutItem.html

Condition Expression is used for PutItem DML conditions. you can specify a condition expression to determine which items should be modified. If the condition expression evaluates to true, the operation succeeds; otherwise, the operation fails. To evalute if the update or new enrty should be made if the key attributes are same. example : The PutItem operation overwrites an item with the same key (if it exists). If you want to avoid this, use a condition expression. This allows the write to proceed only if the item in question does not already have the same key. C is correct.

TableStatus should be ACTIVE

C https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeTable.html

C final answer

C is the right one