-To address these issues, TiDB introduces the global indexes feature in v8.3.0. A global index covers the data of the entire table with a single index, allowing primary keys and unique keys to maintain global uniqueness without including all partition keys. Moreover, global indexes can access index data across multiple partitions in a single operation instead of looking up the local index for each partition, significantly improving query performance for non-partitioned keys. Starting from v9.0.0, non-unique indexes can also be created as global indexes.
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