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