You can configure different batching strategies using the tikv-client.batch-policy configuration item to accommodate various workloads. For more information, see documentation. • TiFlash introduces 41 To enable virtual IP management, specify the virtual IP address using the TiProxy configuration item ha.virtual-ip and specify the network interface to bind the virtual IP to using ha.interface. The scenarios with many tables or partitions, this process can take a long time. When the configuration item force-init-stats is set to ON, TiDB does not provide services until the initial statistics are loaded

and client state- ment cache #54850 @dbsid By enabling the logical-import-prep-stmt configuration item, the SQL statements executed in TiDB Lightning’s logical import mode will use prepared statements pessimistic locks being written to disk. #17542 @cfzjywxk • Introduce a new spill-dir configuration item in Raft Engine, supporting multi- disk storage for Raft logs; when the disk where the home directory can be adjusted to 120 MiB You can adjust the size limit via the txn-entry-size-limit configuration item. 2.5.6 Limitations on data types Type Upper limit CHAR 256 characters BINARY 256 characters VARBINARY

and client state- ment cache #54850 @dbsid By enabling the logical-import-prep-stmt configuration item, the SQL statements executed in TiDB Lightning’s logical import mode will use prepared statements pessimistic locks being written to disk. #17542 @cfzjywxk • Introduce a new spill-dir configuration item in Raft Engine, supporting multi- disk storage for Raft logs; when the disk where the home directory can be adjusted to 120 MiB You can adjust the size limit via the txn-entry-size-limit configuration item. 2.5.6 Limitations on data types Type Upper limit CHAR 256 characters BINARY 256 characters VARBINARY

specific times that TiKV initiates periodic full compaction by configur- ing the TiKV configuration item periodic-full-compact-start-times and limit the maximum CPU usage rate for TiKV periodic full compaction Before v7.6.0, the size of a single row record in a transaction is limited by the TiDB configuration item txn-entry-size-limit. If the size limit is exceeded, TiDB returns the entry too large error. In this value of the txn-entry-size-limit configuration item. The default value of this variable is 0, which means that TiDB uses the value of the configuration item txn-entry-size- �→ limit by default. When this

location. According to the load balancing policy specified in the �→ policy configuration item, TiProxy dynamically selects �→ the optimal TiDB node to execute database operations. This optimizes affect business scaling. Adaptive concurrent loading is now supported. By default, the configuration item stats-load-concurrency is set to 0, and the concurrency of statistics loading is au- tomatically configure the combination and priority of load balancing policies through the policy configuration item. 39 • resource: the resource priority policy performs load balancing based on the following priority

dant MVCC rows required to trigger RocksDB com- paction. Starting from v7.5.0, this configu- ration item takes effect for the "raft- �→ kv" storage engine. 47 Configuration file Configuration parame- dant MVCC rows required to trigger RocksDB com- paction. Starting from v7.5.0, this configu- ration item takes effect for the "raft- �→ kv" storage engine. 48 Configuration file Configuration parame- adjusted to 120 MiB 83 You can adjust the size limit via the txn-entry-size-limit configuration item. 2.5.6 Limitations on data types Type Upper limit CHAR 256 characters BINARY 256 characters VARBINARY

intermediate versions. 2.2.2.1 Behavior changes • In earlier versions, the tidb.tls configuration item in TiDB Lightning treats values "false" and "" the same, as well as treating the values "preferred" Deprecated Starting from v8.1.0, the teleme- try feature in TiDB is removed, and this configu- ration item is no longer func- tional. It is retained solely for compati- bility with earlier versions. 48 Configuration Starting from v8.1.0, the teleme- try feature in TiDB Dash- board is removed, and this configu- ration item is no longer func- tional. It is retained solely for compati- bility with earlier versions. 49 Configuration

paused for the Region that stores the target table data. It is recommended to set this configuration item to "global" in scenarios with large data volumes to improve stability. For more information, see tions in TiDB. In case of a disk failure that prevents logs from being written, this configu- ration item can trigger the TiDB process to panic instead of hang. The default value is 0, which means no timeout configurations #7272 @breezewish • Tools • Backup & Restore (BR) • Support modifying the TiKV configuration item log-backup.max-flush- �→ interval during log backup #14433 @joccau • TiCDC • Optimize the directory

size, an error will occur. 2.2.1.2 Configuration file parameters Configuration file Configuration item Change type Description TiDB prepared- �→ plan- �→ cache. �→ capacity �→ Modified Controls the number cached statements. The default value is changed from 100 to 1000. 32 Configuration file Configuration item Change type Description TiKV storage. �→ reserve �→ -space Modified Controls space reserved for Modified This configu- ration item is new in TiDB v5.3.0 and its value is calculated based on storage.block- cache.capacity. 33 Configuration file Configuration item Change type Description TiKV raftstore

intermediate versions. 2.2.2.1 Behavior changes • In earlier versions, the tidb.tls configuration item in TiDB Lightning treats values "false" and "" the same, as well as treating the values "preferred" @HuSharp • Fix the issue that the query result of SHOW CONFIG includes the deprecated con- figuration item trace-region-flow #7917 @rleungx • Fix the issue that the scaling progress is not correctly displayed Grafana is incorrect after you modify the value of the storage.remote.cache.capacity configuration item for TiFlash compute nodes #8920 @JinheLin • Fix the issue that TiFlash metadata might become corrupted