This is an automated cherry-pick of pingcap#15168

Signed-off-by: ti-chi-bot <[email protected]>

system-variables.md

@@ -2047,6 +2047,31 @@ For a system upgraded to v5.0 from an earlier version, if you have not modified
 - Range: `[100, 16384]`
 - This variable is used to set the maximum number of schema versions (the table IDs modified for corresponding versions) allowed to be cached. The value range is 100 ~ 16384.
 
+<<<<<<< HEAD
+=======
+### tidb_max_paging_size <span class="version-mark">New in v6.3.0</span>
+
+- Scope: SESSION | GLOBAL
+- Persists to cluster: Yes
+- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): Yes
+- Type: Integer
+- Default value: `50000`
+- Range: `[1, 9223372036854775807]`
+- Unit: Rows
+- This variable is used to set the maximum number of rows during the coprocessor paging request process. Setting it to too small a value increases the RPC count between TiDB and TiKV, while setting it to too large a value results in excessive memory usage in some cases, such as loading data and full table scan. The default value of this variable brings better performance in OLTP scenarios than in OLAP scenarios. If the application only uses TiKV as the storage engine, consider increasing the value of this variable when executing OLAP workload queries, which might bring you better performance.
+
+### tidb_max_tiflash_threads <span class="version-mark">New in v6.1.0</span>
+
+- Scope: SESSION | GLOBAL
+- Persists to cluster: Yes
+- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
+- Type: Integer
+- Default value: `-1`
+- Range: `[-1, 256]`
+- Unit: Threads
+- This variable is used to set the maximum concurrency for TiFlash to execute a request. The default value is `-1`, indicating that this system variable is invalid and the maximum concurrency depends on the setting of the TiFlash configuration `profiles.default.max_threads`. When the value is `0`, the maximum number of threads is automatically configured by TiFlash.
+
+>>>>>>> ba55227390 (Explain `tidb_max_tiflash_threads` default value `-1` means (#15168))
 ### tidb_mem_oom_action <span class="version-mark">New in v6.1.0</span>
 
 - Scope: GLOBAL