As shown in the following screenshot, three records are stored for a device with the deviceID of 123 . When updating an item in DynamoDB, you may not change any elements of the primary key. The docs for the query method read: If ScanIndexForward is true , DynamoDB returns the results in order, by range key. Querying is a very powerful operation in DynamoDB. With this design, we could use DynamoDB's Query API to fetch the most recent tickets for an organization. Both of these attributes are of type string. Upon receipt of these values, DynamoDB decodes the data into an unsigned byte array and uses that as the length of the binary attribute. When you query you must query for one single value of primary key (not a range) - you can only (optionally) specify a range on the Sort key (also called a range key). The TTL attribute is a great way to naturally expire out items. For the sort key, we’ll use a property called SongPlatinumSalesCount. The property must be one of the scalar string, number, or binary types. This attribute should be an epoch timestamp. – Aylen Feb 25 '16 at 22:07 Your applications must encode binary values in base64-encoded format before sending them to DynamoDB. If the primary key is composite (partition key and sort key), you can use this tag to map your class field to the sort key. However, this design causes some problems. DynamoDB will periodically review your items and delete items whose TTL attribute is before the current time. It cannot be a collection type. For a composite primary key, the maximum length of the second attribute value (the sort key) is 1024 bytes. DynamoDB collates and compares strings using the bytes of the underlying UTF-8 string encoding. Wrapping up. Primary Key. Every DynamoDB table requires a Primary Key, and that key must be unique within the table. Use a Time to Live (TTL) to delete data after 30 days. The primary key is composed of Username (partition key) and Timestamp (sort key). This is the default behavior. Sort keys are also called range attributes or range keys. C. Use Amazon DynamoDB with the source ID as the partition key. Use a different table each day. Maps a class property to the sort key of the table. DynamoDB allows for specification of secondary indexes to aid in this sort of query. So firstly your primary key of Id+Timestamp would basically make it impossible for you to query at all because you'd need an exact timestamp for every read. Using Sort Keys to Organize Data in Amazon DynamoDB, For the sort key, provide the timestamp value of the individual event. You can then issue queries using the between operator and two timestamps, >, or <. B. Then the timestamp for when the ticket was last updated is the sort key, which gives us 'order by' functionality. This allows you to make efficient queries using both the partition key and the sort key. Use Amazon DynamoDB with the source ID as the partition key and the timestamp as the sort key. Dynamodb timestamp sort key. It allows you to select multiple Items that have the same partition ("HASH") key but different sort ("RANGE") keys. Secondary indexes can either be global, meaning that the index spans the whole table across hash keys, or local meaning that the index would exist within each hash key partition, thus requiring the hash key to also be specified when making the query. Step 1: Create a DynamoDB Table with a Stream Enabled In this step, you create a DynamoDB table (BarkTable) to store all of the barks from Woofer users. If ScanIndexForward is false, DynamoDB sorts the results in descending order by range key, and then returns the results to the client. In the second example above, the sort key is the timestamp attribute. For a composite primary key, the maximum length of the second attribute value (the sort key) is 1024 bytes. 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