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DynamoDBからすべてのレーコドを削除する

Last updated at Posted at 2019-08-06

テストように実行したバッチ処理にてDynamoDBに2万件以上のレーコドができてしまった。コンソールで削除するのも時間の無駄なので簡単lambdaにて削除しました。

こんなに簡単ですね!

import boto3
from botocore.exceptions import ClientError

dynamodb = boto3.resource('dynamodb', region_name='ap-northeast-1')
table = dynamodb.Table('my_table_name')

def deleteItem(hashKey, rangeKey):
    try:
        response = table.delete_item(
            Key={
                'my_hash': hashKey,
                'my_range': rangeKey
            }
        )
    except ClientError as e:
        raise
    else:
        print("DeleteItem succeeded:")
        
def lambda_handler(event, context):
    
    pe = "my_hash, my_range" #projection fields
    
    response = table.scan(
        ProjectionExpression=pe,
        )
    for i in response['Items']:
        hashKey = i["my_hash"]
        rangeKey = i["my_range"] 
        deleteItem(hashKey,rangeKey)
    
    while 'LastEvaluatedKey' in response:
        response = table.scan(
            ProjectionExpression=pe,
            ExclusiveStartKey=response['LastEvaluatedKey']
            )
    
        for i in response['Items']:
            hashKey = i["my_hash"]
            rangeKey = i["my_range"] 
            deleteItem(hashKey,rangeKey)
    
    
    return 'Successfully complete delete all items from table.'
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