How do I add a global secondary index in DynamoDB?
Open the DynamoDB console at https://console.aws.amazon.com/dynamodb/ .
- In the navigation pane on the left side of the console, choose Tables.
- Choose the Music table from the table list.
- Choose the Indexes tab for the Music table.
- Choose Create index.
- For the Partition key, enter AlbumTitle .
What is a global secondary index?
Global secondary index—An index with a partition key and a sort key that can be different from those on the base table. A global secondary index is considered “global” because queries on the index can span all of the data in the base table, across all partitions.
How long does it take to create a global secondary index?
Employee job titles are stored under GSI_2_SK . Run the following AWS CLI command. Wait until the global secondary index has been created. This takes approximately 5 minutes.
How do I create a GSI?
AWS DynamoDB Console
- Open DynamoDB Console. Go to AWS DynamoDB console and open up your DynamoDB table.
- Create GSI. After clicking on Create Index button, you will see the following popup to configure an index. An index’s partition key can be of String, Binary or Number type.
Can you add a GSI to an existing table?
To add a global secondary index to an existing table, use the UpdateTable operation with the GlobalSecondaryIndexUpdates parameter. You must provide the following: An index name. The name must be unique among all the indexes on the table.
How does GSI work in DynamoDB?
For global secondary index queries, DynamoDB calculates the provisioned read activity in the same way as it does for queries against tables. The only difference is that the calculation is based on the sizes of the index entries, rather than the size of the item in the base table.
Can you add GSI to existing table?
Can GSI be empty?
If the key doesn’t appear in every table item, the global secondary index is said to be sparse. Avoid storing null and empty values for the global secondary index key attributes. If the value of a global secondary index key attribute is null or empty, it is better to just skip the attribute when writing it.
Can I add GSI to existing table?
Does GSI need to be unique?
However, the key values in a global secondary index do not need to be unique.
Can we add local secondary index to existing table?
Local secondary indexes are created at the same time that you create a table. You cannot add a local secondary index to an existing table, nor can you delete any local secondary indexes that currently exist. A global secondary index lets you query over the entire table, across all partitions.
What is secondary index in DynamoDB?
Secondary indexes are a critical part of modeling your data in DynamoDB. With a secondary index, you can add additional access patterns to your application without the hassle of maintaining multiple copies of the same data. DynamoDB will handle all replication from the base table to your secondary index.
How do I add a global secondary index to a table?
we created a Global secondary index on the table using the addGlobalSecondaryIndex method. The props we have passed to the method are: readCapacity and writeCapacity – the capacity for the global secondary index. These properties can only be provided if the table is configured with PROVISIONED capacity.
What are the candidate fields of a global secondary index?
Candidate fields of a global secondary index include the candidate partition key, candidate sort key, and attribute projections. Global secondary indexes use the value of the partition key as input to an internal hash function, which is similar to how a partition key is used in a DynamoDB table.
When DynamoDB has finished building a global secondary index, the index status changes from CREATING to ACTIVE . To add a global secondary index to an existing table, use the UpdateTable operation with the GlobalSecondaryIndexUpdates parameter. You must provide the following: An index name.
How can I create a global secondary index for game scores?
You could create a global secondary index with a partition key of TopScore and a sort key of TopScoreDateTime. You might use such an index to determine whether there is a correlation between high scores and the time of day a game is played.