You are viewing the documentation of TiDB v6.0 (DMR). PingCAP does not provide bug fixes for v6.0. Any bugs will be fixed in future releases.

For general purposes, please use the latest LTS version of the TiDB database.

TiDB 1.0.2 Release Notes

On November 13, 2017, TiDB 1.0.2 is released with the following updates:


  • Optimize the cost estimation of index point query
  • Support the Alter Table Add Column (ColumnDef ColumnPosition) syntax
  • Optimize the queries whose where conditions are contradictory
  • Optimize the Add Index operation to rectify the progress and reduce repetitive operations
  • Optimize the Index Look Join operator to accelerate the query speed for small data size
  • Fix the issue with prefix index judgment

Placement Driver (PD)

  • Improve the stability of scheduling under exceptional situations


  • Support splitting table to ensure one region does not contain data from multiple tables
  • Limit the length of a key to be no more than 4 KB
  • More accurate read traffic statistics
  • Implement deep protection on the coprocessor stack
  • Fix the LIKE behavior and the do_div_mod bug
Was this page helpful?