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TiDB 2.0.5 Release Notes

On July 6, 2018, TiDB 2.0.5 is released. Compared with TiDB 2.0.4, this release has great improvement in system compatibility and stability.


  • New Features
    • Add the tidb_disable_txn_auto_retry system variable which is used to disable the automatic retry of transactions #6877
  • Improvements
    • Optimize the cost calculation of Selection to make the result more accurate #6989
    • Select the query condition that completely matches the unique index or the primary key as the query path directly #6966
    • Execute necessary cleanup when failing to start the service #6964
    • Handle \N as NULL in the Load Data statement #6962
    • Optimize the code structure of CBO #6953
    • Report the monitoring metrics earlier when starting the service #6931
    • Optimize the format of slow queries by removing the line breaks in SQL statements and adding user information #6920
    • Support multiple asterisks in comments #6858
  • Bug Fixes
    • Fix the issue that KILL QUERY always requires SUPER privilege #7003
    • Fix the issue that users might fail to login when the number of users exceeds 1024 #6986
    • Fix an issue about inserting unsigned float/double data #6940
    • Fix the compatibility of the COM_FIELD_LIST command to resolve the panic issue in some MariaDB clients #6929
    • Fix the CREATE TABLE IF NOT EXISTS LIKE behavior #6928
    • Fix an issue in the process of TopN pushdown #6923
    • Fix the ID record issue of the currently processing row when an error occurs in executing Add Index #6903


  • Fix the issue that replicas migration uses up TiKV disks space in some scenarios
  • Fix the crash issue caused by AdjacentRegionScheduler


  • Fix the potential overflow issue in decimal operations
  • Fix the dirty read issue that might occur in the process of merging
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