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You are viewing the documentation of an older version of the TiDB database (TiDB v3.1).

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

TiDB 3.1.1 Release Notes

Release date: April 30, 2020

TiDB version: 3.1.1

TiDB Ansible version: 3.1.1

New Features

  • TiDB

    • Add the table option for auto_rand_base #16812
    • Add the Feature ID comment: In the special comments of SQL statements, only the registered statement fragment can be parsed by the parser; otherwise, the statement is ignored #16155
  • TiFlash

    • Cache the handle and version columns to reduce the disk I/O for a single read request
    • Add in Grafana the graphics related to the read and write workloads of DeltaTree engine
    • Optimize the decimal data encoding in the Chunk codec
    • Reduce the number of open file descriptors when TiFlash is in low workload

Bug Fixes

  • TiDB

    • Fix the issue that the isolation read setting at the instance level does not take effect, and that the isolation read setting is incorrectly retained after TiDB is upgraded #16482 #16802
    • Fix the partition selection syntax on the hash partitioned table so that an error is not reported for syntaxes such as partition (P0) #16076
    • Fix the issue that when an UPDATE SQL statement only queries from a view but does not update the view, the update statement still reports an error #16789
    • Fix the issue of wrong results caused by removing the not not from the nested query #16423
  • TiFlash

    • Fix the issue that an error occurs when reading data from a Region that is in the abnormal state
    • Modify the mapping of table names in TiFlash to correctly support recover table/flashback table
    • Modify the storage path to fix the potential data loss issue that occurs when renaming a table
    • Modify the read mode in the online update scenario to improve the read performance
    • Fix the issue that TiFlash fails to start normally after upgrade if the database/table name contains special characters
  • Tools

    • Backup & Restore (BR)

      • Fix the issue that after BR restores a table with the auto_random attribute, inserting data might trigger the duplicate entry error #241