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You are viewing the documentation of an older version of the TiDB database (TiDB v2.1).

It is recommended that you use the latest stable version of the TiDB database.

TiDB 2.0 RC4 Release Notes

On March 30, 2018, TiDB 2.0 RC4 is released. This release has great improvement in MySQL compatibility, SQL optimization and stability.


  • Fix the issue that the Expression in UnionScan is not cloned
  • Support the SET TRANSACTION syntax
  • Fix the potential goroutine leak issue in copIterator
  • Fix the issue that admin check table misjudges the unique index including null
  • Support displaying floating point numbers using scientific notation
  • Fix the type inference issue during binary literal computing
  • Fix the issue in parsing the CREATE VIEW statement
  • Fix the panic issue when one statement contains both ORDER BY and LIMIT 0
  • Improve the execution performance of DecodeBytes
  • Optimize LIMIT 0 to TableDual, to avoid building useless execution plans


  • Support splitting Region manually to handle the hot spot in a single Region
  • Fix the issue that the label property is not displayed when pdctl runs config show all
  • Optimize metrics and code structure


  • Limit the memory usage during receiving snapshots, to avoid OOM in extreme conditions
  • Support configuring the behavior of Coprocessor when it encounters warnings
  • Support importing the data pattern in TiKV
  • Support splitting Region in the middle
  • Increase the speed of CI test
  • Use crossbeam channel
  • Fix the issue that too many logs are output caused by leader missing when TiKV is isolated