Lower default value for $cfg['MaxExactCount']

Counting of big InnoDB tables is slow, so try to avoid that as much as
possible.

Fixes #13711

Signed-off-by: Michal Čihař <michal@cihar.com>

ChangeLog

@@ -37,6 +37,7 @@ phpMyAdmin - ChangeLog
 - issue        Consolidate functions into class files
 - issue #13560 Add support for changing collation for all tables and columns in database
 - issue #13303 Add support for creating fulltext index from table structure
+- issue #13711 Lower default value for $cfg['MaxExactCount']
 
 4.7.5 (not yet released)
 - issue #13615 Avoid problems with browsing unknown query types

doc/config.rst

@@ -3107,7 +3107,7 @@ Various display setting
 .. config:option:: $cfg['MaxExactCount']
 
     :type: integer
-    :default: 500000
+    :default: 50000
 
     For InnoDB tables, determines for how large tables phpMyAdmin should
     get the exact row count using ``SELECT COUNT``. If the approximate row
@@ -3115,6 +3115,14 @@ Various display setting
     ``SELECT COUNT`` will be used, otherwise the approximate count will be
     used.
 
+    .. versionchanged:: 4.8.0
+
+        The default value was lowered to 50000 for performance reasons.
+
+    .. versionchanged:: 4.2.6
+
+        The default value was changed to 500000.
+
     .. seealso:: :ref:`faq3_11`
 
 .. config:option:: $cfg['MaxExactCountViews']

libraries/config.default.php

@@ -2761,7 +2761,7 @@ $cfg['BrowseMIME'] = true;
  *
  * @global integer $cfg['MaxExactCount']
  */
-$cfg['MaxExactCount'] = 500000;
+$cfg['MaxExactCount'] = 50000;
 
 /**
  * Zero means that no row count is done for views; see the doc