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tidb v2.1.13 Release Notes

Release Date: 2019-06-21 // almost 5 years ago
    • Add a feature to use SHARD_ROW_ID_BITS to scatter row IDs when the column contains an AUTO_INCREMENT attribute to relieve the hotspot issue #10788
    • 📇 Optimize the lifetime of invalid DDL metadata to speed up recovering the normal execution of DDL operations after upgrading the TiDB cluster #10789
    • 🛠 Fix the OOM issue in high concurrent scenarios caused by the failure to quickly release Coprocessor resources, resulted from the execdetails.ExecDetails pointer #10833
    • ➕ Add the update-stats configuration item to control whether to update statistics #10772
    • ➕ Add the following TiDB-specific syntax to support Region presplit to solve the hotspot issue:
      • Add the PRE_SPLIT_REGIONS table option #10863
      • Add the SPLIT TABLE table_name INDEX index_name syntax #10865
      • Add the SPLIT TABLE [table_name] BETWEEN (min_value...) AND (max_value...) REGIONS [region_num] syntax #10882
    • 🛠 Fix the panic issue caused by the KILL syntax in some cases #10879
    • 👌 Improve the compatibility with MySQL for ADD_DATE in some cases #10718
    • 🛠 Fix the wrong estimation for the selectivity rate of the inner table selection in index join #10856