Creating partition keys for existing tables

If you already have tables in Timestream for LiveAnalytics and want to use customer-defined partition keys, you will need to migrate your data into a new table with the desired partitioning schema definition. This can be done using export to S3 and batch load together, which involves exporting the data from the existing table to S3, modifying the data to include the partition key (if necessary) and adding headers to your CSV files, and then importing the data into a new table with the desired partitioning schema defined. Keep in mind that this method can be time consuming and costly, especially for large tables.

Alternatively, you can use scheduled queries to migrate your data to a new table with the desired partitioning schema. This method involves creating a scheduled query that reads from the existing table and writes to the new table. The scheduled query can be set up to run on a regular basis until all the data has been migrated. Keep in mind that you will be charged for reading and writing the data during the migration process.