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In a non-sharded DB, I could just use auto-increment to generate a unique ID to reference a specific row.
I want to shard my DB, say into 12 shards. Now when I insert into a specific shard, the auto-increment ID is no longer unique.
Would like to hear anyone’s experience in dealing with this problem.
A few approaches
1) Give each shard it’s own ID, and use a composite key
2) Give each shard it’s own ID and set ID ranges for each shard
3) Use a globally unique ID – GUID