change expressions related to statement summary tables (#6299) (#6383)

pingcap · Sep 3, 2021 · 15b1b94 · 15b1b94
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diff --git a/system-variables.md b/system-variables.md
@@ -805,31 +805,31 @@ SET tidb_slow_log_threshold = 200;
 
 - Scope: SESSION | GLOBAL
 - Default value: 24 (the value of the default configuration file)
-- This variable is used to set the history capacity of the statement summary.
+- This variable is used to set the history capacity of [statement summary tables](/statement-summary-tables.md).
 
 ### tidb_stmt_summary_internal_query <span class="version-mark">New in v4.0</span>
 
 - Scope: SESSION | GLOBAL
 - Default value: 0 (the value of the default configuration file)
-- This variable is used to control whether to include the SQL information of TiDB in the statement summary.
+- This variable is used to control whether to include the SQL information of TiDB in [statement summary tables](/statement-summary-tables.md).
 
 ### tidb_stmt_summary_max_sql_length <span class="version-mark">New in v4.0</span>
 
 - Scope: SESSION | GLOBAL
 - Default value: 4096 (the value of the default configuration file)
-- This variable is used to control the length of the SQL string in the statement summary.
+- This variable is used to control the length of the SQL string in [statement summary tables](/statement-summary-tables.md).
 
 ### tidb_stmt_summary_max_stmt_count <span class="version-mark">New in v4.0</span>
 
 - Scope: SESSION | GLOBAL
 - Default value: Before v4.0.14, the default value is 200. Since v4.0.14, the default value is 3000 (the value of the default configuration file).
-- This variable is used to set the maximum number of statements that the statement summary stores in memory.
+- This variable is used to set the maximum number of statements that [statement summary tables](/statement-summary-tables.md) store in memory.
 
 ### tidb_stmt_summary_refresh_interval <span class="version-mark">New in v4.0</span>
 
 - Scope: SESSION | GLOBAL
 - Default value: 1800 (the value of the default configuration file)
-- This variable is used to set the refresh time of the statement summary. The unit is second.
+- This variable is used to set the refresh time of [statement summary tables](/statement-summary-tables.md). The unit is second.
 
 ### tidb_store_limit <span class="version-mark">New in v3.0.4 and v4.0</span>
 

diff --git a/tidb-configuration-file.md b/tidb-configuration-file.md
@@ -569,16 +569,16 @@ Configuration related to the status of TiDB service.
 
 ## stmt-summary <span class="version-mark">New in v3.0.4</span>
 
-Configurations related to the `events_statement_summary_by_digest` table.
+Configurations related to [statement summary tables](/statement-summary-tables.md).
 
 ### max-stmt-count
 
-- The maximum number of SQL categories allowed to be saved in the `events_statement_summary_by_digest` table.
-- Default value: `100`
+- The maximum number of SQL categories allowed to be saved in [statement summary tables](/statement-summary-tables.md).
+- Default value: Before v4.0.14, the default value is `200`. Since v4.0.14, the default value is `3000`.
 
 ### max-sql-length
 
-- The longest display length for the `DIGEST_TEXT` and `QUERY_SAMPLE_TEXT` columns in the `events_statement_summary_by_digest` table.
+- The longest display length for the `DIGEST_TEXT` and `QUERY_SAMPLE_TEXT` columns in [statement summary tables](/statement-summary-tables.md).
 - Default value: `4096`
 
 ## pessimistic-txn