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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 1.1 Beta Release Notes

On February 24, 2018, TiDB 1.1 Beta is released. This release has great improvement in MySQL compatibility, SQL optimization, stability, and performance.

TiDB

  • Add more monitoring metrics and refine the log
  • Compatible with more MySQL syntax
  • Support displaying the table creating time in information_schema
  • Optimize queries containing the MaxOneRow operator
  • Configure the size of intermediate result sets generated by Join, to further reduce the memory used by Join
  • Add the tidb_config session variable to output the current TiDB configuration
  • Fix the panic issue in the Union and Index Join operators
  • Fix the wrong result issue of the Sort Merge Join operator in some scenarios
  • Fix the issue that the Show Index statement shows indexes that are in the process of adding
  • Fix the failure of the Drop Stats statement
  • Optimize the query performance of the SQL engine to improve the test result of the Sysbench Select/OLTP by 10%
  • Improve the computing speed of subqueries in the optimizer using the new execution engine; compared with TiDB 1.0, TiDB 1.1 Beta has great improvement in tests like TPC-H and TPC-DS

PD

  • Add the Drop Region debug interface
  • Support setting priority of the PD leader
  • Support configuring stores with a specific label not to schedule Raft leaders
  • Add the interfaces to enumerate the health status of each PD
  • Add more metrics
  • Keep the PD leader and the etcd leader together as much as possible in the same node
  • Improve the priority and speed of restoring data when TiKV goes down
  • Enhance the validity check of the data-dir configuration item
  • Optimize the performance of Region heartbeat
  • Fix the issue that hot spot scheduling violates label constraint
  • Fix other stability issues

TiKV

  • Traverse locks using offset + limit to avoid potential GC problems
  • Support resolving locks in batches to improve GC speed
  • Support GC concurrency to improve GC speed
  • Update the Region size using the RocksDB compaction listener for more accurate PD scheduling
  • Delete the outdated data in batches using DeleteFilesInRanges, to make TiKV start faster
  • Configure the Raft snapshot max size to avoid the retained files taking up too much space
  • Support more recovery operations in tikv-ctl
  • Optimize the ordered flow aggregation operation
  • Improve metrics and fix bugs