type Y Y Y N N Temporary tables Y N N N N 2.3.6 Transactions Transactions 5.3 5.2 5.1 5.0 4.0 Async commit Y Y Y Y N 1PC Y Y Y Y N Large transactions (10GB) Y Y Y Y Y Pessimistic transactions Y Y tidb_hashagg_final_concurrency=1; set global tidb_hashagg_partial_concurrency=1; set global tidb_enable_async_commit = 1; set global tidb_enable_1pc = 1; set global tidb_guarantee_linearizability = 0; set global tidb_hashagg_final_concurrency=1; set global tidb_hashagg_partial_concurrency=1; set global tidb_enable_async_commit = 1; set global tidb_enable_1pc = 1; set global tidb_guarantee_linearizability = 0; set global

so this system variable will be deprecated. 84 • TiDB introduces the system variable tidb_enable_async_merge_global_stats in v7.5.0. You can use it to set TiDB to use asynchronous merging of partition AUTO_INCREMENT columns 94 2.3.6 Transactions Transactions 8.4 8.3 8.2 8.1 7.5 7.1 6.5 6.1 5.4 5.3 5.2 5.1 Async commit Y Y Y Y Y Y Y Y Y Y Y Y 1PC Y Y Y Y Y Y Y Y Y Y Y Y Large transactions (1 TiB) Y Y Y Y Y 0, which allows data exchange between nodes and provides high-performance, high-throughput SQL algorithms. In the MPP mode, the run time of the analytic queries can be significantly reduced. 3.2.2 Steps

so this system variable will be deprecated. 79 • TiDB introduces the system variable tidb_enable_async_merge_global_stats in v7.5.0. You can use it to set TiDB to use asynchronous merging of partition AUTO_INCREMENT columns 89 2.3.6 Transactions Transactions 8.4 8.3 8.2 8.1 7.5 7.1 6.5 6.1 5.4 5.3 5.2 5.1 Async commit Y Y Y Y Y Y Y Y Y Y Y Y 1PC Y Y Y Y Y Y Y Y Y Y Y Y Large transactions (1 TiB) Y Y Y Y Y 0, which allows data exchange between nodes and provides high-performance, high-throughput SQL algorithms. In the MPP mode, the run time of the analytic queries can be significantly reduced. 126 3.2

When it is 3, the data file contains metadata and token data checksum, and supports multiple hash algorithms. TiFlash logger. �→ count Modified The default value is changed to 10. TiFlash status. �→ metrics_port Y Y N N Temporary tables Y Y N N N N 2.3.6 Transactions Transactions 5.4 5.3 5.2 5.1 5.0 4.0 Async commit Y Y Y Y Y N 1PC Y Y Y Y Y N Large transactions (10GB) Y Y Y Y Y Y Pessimistic transactions tidb_hashagg_final_concurrency=1; set global tidb_hashagg_partial_concurrency=1; set global tidb_enable_async_commit = 1; set global tidb_enable_1pc = 1; set global tidb_guarantee_linearizability = 0; set global

the overhead of network transmission #7084 @solotzg The TiFlash MPP mode supports multiple Join algorithms. Before v7.1.0, TiDB de- termines whether the MPP mode uses the Broadcast Hash Join algorithm based time), TiDB automatically estimates the threshold of network transmission by 38 different Join algorithms, and then chooses the algorithm with the smallest overhead overall, thus reducing network traffic CLUSTER Y Y N N N N N N N 2.3.6 Transactions Transactions 7.1 6.5 6.1 5.4 5.3 5.2 5.1 5.0 4.0 Async commit Y Y Y Y Y Y Y Y N 4Starting from v6.4.0, TiDB supports high-performance and globally monotonic

�→ Newly added Controls the sam- pling concur- rency of the ANALYZE �→ pro- cess. tidb_enable_async_merge_global_stats �→ Newly added This vari- able is used by TiDB to merge statis- tics asyn- chronously Improvements • TiDB • Optimize the concurrency model of merging GlobalStats: introduce tidb_enable_async_merge_global_stats �→ to enable simultaneous loading and merging of statistics, which speeds up the DDL Y N N N N N N N N N 2.3.6 Transactions Transactions 7.5 7.1 6.5 6.1 5.4 5.3 5.2 5.1 5.0 4.0 Async commit Y Y Y Y Y Y Y Y Y N 1PC Y Y Y Y Y Y Y Y Y N Large transactions (10GB) Y Y Y Y Y Y Y Y Y Y

meta Region leader reads on schema version updates #48125 @cfzjywxk • TiKV • Add an API endpoint /async_tasks for querying asynchronous tasks #15759 @YuJuncen • Add priority labels to gRPC monitoring N N N N N N N N N 2.3.6 Transactions Transactions 7.6 7.5 7.1 6.5 6.1 5.4 5.3 5.2 5.1 5.0 4.0 Async commit Y Y Y Y Y Y Y Y Y Y N 1PC Y Y Y Y Y Y Y Y Y Y N Large transactions (10GB) Y Y Y Y Y Y Y Y 0, which allows data exchange between nodes and provides high-performance, high-throughput SQL algorithms. In the MPP mode, the run time of the analytic queries can be significantly reduced. 3.2.2 Steps

FLASHBACK CLUSTER Y N N N N N N N 2.3.6 Transactions Transactions 6.5 6.1 5.4 5.3 5.2 5.1 5.0 4.0 Async commit Y Y Y Y Y Y Y N 1PC Y Y Y Y Y Y Y N Large transactions (10GB) Y Y Y Y Y Y Y Y Pessimistic 0, which allows data exchange between nodes and provides high-performance, high-throughput SQL algorithms. In the MPP mode, the run time of the analytic queries can be significantly reduced. 3.2.2 Steps from "fs"; // Step 2. Load environment variables from .env file to process.env. dotenv.config(); async function main() { // Step 3. Create a connection to the TiDB cluster. const options = { host: process

and Join operators’ results to go wrong #23887 – Fix a bug that the primary lock fallen back from async commit cannot be resolved #24384 42 – Fix a GC issue of statistics that might cause duplicated Compaction Filter feature is enabled – Fix the issue that TiFlash cannot resolve the lock fallen back from async commit – Fix the issue of incorrect results returned when the casted result of the TIMEZONE type Experimental Experimental Change column type Y Y N N 2.3.6 Transactions Transactions 5.2 5.1 5.0 4.0 Async commit Y Y Y N 1PC Y Y Y N Large transactions (10GB) Y Y Y Y Pessimistic transactions Y Y Y Y

Experimental Experimental Change column type Y Y N N 2.3.6 Transactions Transactions 5.2 5.1 5.0 4.0 Async commit Y Y Y N 1PC Y Y Y N Large transactions (10GB) Y Y Y Y Pessimistic transactions Y Y Y Y tidb_hashagg_final_concurrency=1; set global tidb_hashagg_partial_concurrency=1; set global tidb_enable_async_commit = 1; set global tidb_enable_1pc = 1; set global tidb_guarantee_linearizability = 0; set global tidb_hashagg_final_concurrency=1; set global tidb_hashagg_partial_concurrency=1; set global tidb_enable_async_commit = 1; set global tidb_enable_1pc = 1; set global tidb_guarantee_linearizability = 0; set global