Why batch operations improve efficiency in DynamoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to batch write multiple items in DynamoDB.

DynamoDB

response = table.[1](RequestItems=batch_items)

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Abatch_write_item

Bput_item

Cget_item

Ddelete_item

Attempts:

3 left

💡 Hint

Common Mistakes

Using put_item writes only one item at a time.

get_item is for reading, not writing.

delete_item removes items, not writes.

The batch_write_item method allows writing multiple items in one request, improving efficiency.

2fill in blank

medium

Complete the code to prepare a batch of items for writing.

DynamoDB

batch_items = {table_name: [[1]]}

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A{'GetRequest': {'Key': item}}

B{'DeleteRequest': {'Key': item}}

C{'PutRequest': {'Item': item}}

D{'UpdateRequest': {'Key': item}}

Attempts:

3 left

💡 Hint

Common Mistakes

Using GetRequest is for reading, not writing.

DeleteRequest removes items, not adds.

UpdateRequest is not valid in batch write.

Batch write requires PutRequest with the item to add.

3fill in blank

hard

Fix the error in the batch write code by choosing the correct parameter name.

DynamoDB

response = client.batch_write_item([1]=batch_items)

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AWriteItems

BRequestItems

CBatchItems

DItems

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Items' causes a parameter error.

BatchItems and WriteItems are not valid parameter names.

The correct parameter name is RequestItems for batch_write_item.

4fill in blank

hard

Fill both blanks to create a batch get request for multiple keys.

DynamoDB

response = client.batch_get_item(RequestItems=[1]: [2])

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Atable_name

B{'Keys': [key for key in keys]}

Cbatch_items

D[{'Item': key} for key in keys]

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'batch_items' instead of table name.

Using 'Item' instead of direct key dicts in the list.

Batch get requires the table name as key and a dict with "Keys" containing list of key dictionaries.

5fill in blank

hard

Fill all three blanks to filter batch get results by attribute existence.

DynamoDB

filtered = [item for item in response['Responses'][[1]] if [2] in item and item[[3]] == True]

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Atable_name

B'attribute_exists'

C'isActive'

D'Key'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'attribute_exists' as a key in item is incorrect.

Confusing 'Key' with 'attribute_exists' or 'isActive'.

We access items by table name, check for 'isActive' existence, and filter where 'isActive' is True.