diff --git a/db_operations.php b/db_operations.php
index 215bbbaf2375..0bd9eef58541 100644
--- a/db_operations.php
+++ b/db_operations.php
@@ -343,11 +343,7 @@
 }
 
 $db_collation = PMA_getDbCollation($db);
-if (strtolower($db) == 'information_schema' || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
-    $is_information_schema = true;
-} else {
-    $is_information_schema = false;
-}
+$is_information_schema = PMA_is_system_schema($db);
 
 if (!$is_information_schema) {
     if ($cfgRelation['commwork']) {
diff --git a/libraries/List.class.php b/libraries/List.class.php
index a64a8b487540..8303227b6884 100644
--- a/libraries/List.class.php
+++ b/libraries/List.class.php
@@ -83,8 +83,7 @@ public function getHtmlOptions($selected = '', $include_information_schema = tru
         $options = '';
         foreach ($this as $each_item) {
             if (false === $include_information_schema
-                    && 'information_schema' === strtolower($each_item)
-                    && (!PMA_DRIZZLE || 'data_dictionary' == strtolower($each_item))) {
+                    && PMA_is_system_schema($each_item)) {
                 continue;
             }
             $options .= '<option value="' . htmlspecialchars($each_item) . '"';
diff --git a/libraries/Table.class.php b/libraries/Table.class.php
index 4a4a4c0d9077..3df85ed08aab 100644
--- a/libraries/Table.class.php
+++ b/libraries/Table.class.php
@@ -516,7 +516,7 @@ static public function countRecords($db, $table, $force_exact = false, $is_view
             if (false === $row_count || $row_count < $GLOBALS['cfg']['MaxExactCount']) {
                 // Make an exception for views in I_S and D_D schema in Drizzle, as these map to
                 // in-memory data and should execute fast enough
-                if (! $is_view || (PMA_DRIZZLE && (strtolower($db) == 'information_schema' || strtolower($db) == 'data_dictionary'))) {
+                if (! $is_view || (PMA_DRIZZLE && PMA_is_system_schema($db))) {
                     $row_count = PMA_DBI_fetch_value(
                         'SELECT COUNT(*) FROM ' . PMA_backquote($db) . '.'
                         . PMA_backquote($table)
diff --git a/libraries/blobstreaming.lib.php b/libraries/blobstreaming.lib.php
index 195a1be62266..cdcbb0b5e89f 100644
--- a/libraries/blobstreaming.lib.php
+++ b/libraries/blobstreaming.lib.php
@@ -26,8 +26,7 @@ function initPBMSDatabase()
                 return true;
             }
             if ($target == "") {
-                if ($current_db != 'pbxt' && $current_db != 'mysql' && strtolower($current_db) != 'information_schema'
-                        && (!PMA_DRIZZLE || strtolower($current_db) != 'data_dictionary')) {
+                if ($current_db != 'pbxt' && !PMA_is_system_schema($current_db, true)) {
                     $target = $current_db;
                 }
             }
diff --git a/libraries/build_html_for_db.lib.php b/libraries/build_html_for_db.lib.php
index bc6a3f6eb53e..422beffef02a 100644
--- a/libraries/build_html_for_db.lib.php
+++ b/libraries/build_html_for_db.lib.php
@@ -79,9 +79,7 @@ function PMA_buildHtmlForDb($current, $is_superuser, $checkall, $url_query, $col
         $out .= '<td class="tool">';
         $out .= '<input type="checkbox" name="selected_dbs[]" title="' . htmlspecialchars($current['SCHEMA_NAME']) . '" value="' . htmlspecialchars($current['SCHEMA_NAME']) . '" ';
 
-        if (strtolower($current['SCHEMA_NAME']) != 'information_schema'
-                && (PMA_DRIZZLE || $current['SCHEMA_NAME'] != 'mysql')
-                && (!PMA_DRIZZLE || strtolower($current['SCHEMA_NAME']) != 'data_dictionary')) {
+        if (!PMA_is_system_schema($current['SCHEMA_NAME'], true)) {
             $out .= (empty($checkall) ? '' : 'checked="checked" ') . '/>';
         } else {
             $out .= ' disabled="disabled" />';
diff --git a/libraries/common.lib.php b/libraries/common.lib.php
index b8f5a2329af2..7df77268153a 100644
--- a/libraries/common.lib.php
+++ b/libraries/common.lib.php
@@ -720,8 +720,7 @@ function PMA_getTableList($db, $tables = null, $limit_offset = 0, $limit_count =
             // set this because PMA_Table::countRecords() can use it
             $tbl_is_view = $table['TABLE_TYPE'] == 'VIEW';
 
-            if ($tbl_is_view || strtolower($db) == 'information_schema'
-                    || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
+            if ($tbl_is_view || PMA_is_system_schema($db)) {
                 $table['Rows'] = PMA_Table::countRecords($db, $table['Name'], false, true);
             }
         }
diff --git a/libraries/database_interface.lib.php b/libraries/database_interface.lib.php
index ebc77c02bae2..3b89264b8cd4 100644
--- a/libraries/database_interface.lib.php
+++ b/libraries/database_interface.lib.php
@@ -1662,6 +1662,21 @@ function PMA_DBI_get_triggers($db, $table = '', $delimiter = '//')
     return($result);
 }
 
+/**
+ * Checks whether given schema is a system schema: information_schema (MySQL and Drizzle)
+ * or data_dictionary (Drizzle)
+ *
+ * @param string $schema_name
+ * @param bool   $test_for_mysql_schema Whether 'mysql' schema should be treated the same as IS and DD
+ * @return bool
+ */
+function PMA_is_system_schema($schema_name, $test_for_mysql_schema = false)
+{
+    return strtolower($schema_name) == 'information_schema'
+            || (PMA_DRIZZLE && strtolower($schema_name) == 'data_dictionary')
+            || ($test_for_mysql_schema && !PMA_DRIZZLE && $schema_name == 'mysql');
+}
+
 /**
  * Returns true if $db.$view_name is a view, false if not
  *
diff --git a/libraries/db_common.inc.php b/libraries/db_common.inc.php
index d7c18f775288..05ee295f7f9f 100644
--- a/libraries/db_common.inc.php
+++ b/libraries/db_common.inc.php
@@ -18,11 +18,9 @@
 
 $is_show_stats = $cfg['ShowStats'];
 
-if (strtolower($db) == 'information_schema' || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
+$db_is_information_schema = PMA_is_system_schema($db);
+if ($db_is_information_schema) {
     $is_show_stats = false;
-    $db_is_information_schema = true;
-} else {
-    $db_is_information_schema = false;
 }
 
 /**
diff --git a/libraries/db_info.inc.php b/libraries/db_info.inc.php
index 70d3df4868a1..9a92bad57d99 100644
--- a/libraries/db_info.inc.php
+++ b/libraries/db_info.inc.php
@@ -85,7 +85,7 @@ function PMA_fillTooltip(&$tooltip_truename, &$tooltip_aliasname, $table)
  */
 $db_is_information_schema = false;
 
-if (strtolower($db) == 'information_schema' || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
+if (PMA_is_system_schema($db)) {
     $is_show_stats = false;
     $db_is_information_schema = true;
 }
diff --git a/libraries/mysql_charsets.lib.php b/libraries/mysql_charsets.lib.php
index 4c8a2a9a7c6f..e9d8d675af4d 100644
--- a/libraries/mysql_charsets.lib.php
+++ b/libraries/mysql_charsets.lib.php
@@ -166,7 +166,7 @@ function PMA_generateCharsetQueryPart($collation)
  */
 function PMA_getDbCollation($db)
 {
-    if (strtolower($db) == 'information_schema' || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
+    if (PMA_is_system_schema($db)) {
         // We don't have to check the collation of the virtual
         // information_schema database: We know it!
         return 'utf8_general_ci';
diff --git a/libraries/replication.inc.php b/libraries/replication.inc.php
index 857f4dc8dafe..0871d32ec591 100644
--- a/libraries/replication.inc.php
+++ b/libraries/replication.inc.php
@@ -266,7 +266,7 @@ function PMA_replication_master_replicated_dbs($link = null)
 
     $tmp_alldbs = PMA_DBI_query('SHOW DATABASES;', $link);
     while ($tmp_row = PMA_DBI_fetch_row($tmp_alldbs)) {
-        if ($tmp_row[0] == 'information_schema')
+        if (PMA_is_system_schema($tmp_row[0]))
             continue;
         if (count($do_db) == 0) {
             if (array_search($tmp_row[0], $ignore_db) !== false) {
diff --git a/libraries/replication_gui.lib.php b/libraries/replication_gui.lib.php
index 2f57b2b37bc2..227dc5bcd9e1 100644
--- a/libraries/replication_gui.lib.php
+++ b/libraries/replication_gui.lib.php
@@ -19,7 +19,7 @@ function PMA_replication_db_multibox()
     $multi_values .= '<select name="db_select[]" size="6" multiple="multiple" id="db_select">';
 
     foreach ($GLOBALS['pma']->databases as $current_db) {
-        if ('information_schema' == $current_db) {
+        if (PMA_is_system_schema($current_db)) {
             continue;
         }
         if (! empty($selectall) || (isset($tmp_select) && strpos(' ' . $tmp_select, '|' . $current_db . '|'))) {
diff --git a/libraries/tbl_common.php b/libraries/tbl_common.php
index 7f27180544e3..a7ecf18cdf0d 100644
--- a/libraries/tbl_common.php
+++ b/libraries/tbl_common.php
@@ -17,11 +17,7 @@
 // Check parameters
 PMA_checkParameters(array('db', 'table'));
 
-if (strtolower($db) === 'information_schema' || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
-    $db_is_information_schema = true;
-} else {
-    $db_is_information_schema = false;
-}
+$db_is_information_schema = PMA_is_system_schema($db);
 
 /**
  * Set parameters for links
diff --git a/navigation.php b/navigation.php
index f2b08cc1dba3..26716ac7bded 100644
--- a/navigation.php
+++ b/navigation.php
@@ -296,7 +296,7 @@ function PMA_exitNavigationFrame()
         echo __('No tables found in database.');
     }
     unset($table_list);
-    if (strtolower($db) != 'information_schema' && (!PMA_DRIZZLE || strtolower($db) != 'data_dictionary')) {
+    if (!PMA_is_system_schema($db)) {
         $class = '';
         $GLOBALS['cfg']['AjaxEnable'] ? $class="ajax" : '';
         echo '<ul id="newtable"><li><a target="frame_content" href="tbl_create.php' . PMA_generate_common_url(array('db' => $GLOBALS['db'])) . '"  class="'.$class .'" >'
diff --git a/server_databases.php b/server_databases.php
index 2ec0e73688f6..c709f83525ed 100644
--- a/server_databases.php
+++ b/server_databases.php
@@ -202,9 +202,7 @@
     $odd_row = true;
     foreach ($databases as $current) {
         $tr_class = $odd_row ? 'odd' : 'even';
-        if (strtolower($current['SCHEMA_NAME']) == 'information_schema'
-                || (!PMA_DRIZZLE && $current['SCHEMA_NAME'] == 'mysql')
-                || (PMA_DRIZZLE && strtolower($current['SCHEMA_NAME']) == 'data_dictionary')) {
+        if (PMA_is_system_schema($current['SCHEMA_NAME'], true)) {
             $tr_class .= ' noclick';
         }
         echo '<tr class="' . $tr_class . '">' . "\n";
diff --git a/server_replication.php b/server_replication.php
index c2fa5550ab95..59d72f70058c 100644
--- a/server_replication.php
+++ b/server_replication.php
@@ -113,7 +113,7 @@
 
         $tmp_alldbs = PMA_DBI_query('SHOW DATABASES;', $src_link);
         while ($tmp_row = PMA_DBI_fetch_row($tmp_alldbs)) {
-            if ($tmp_row[0] == 'information_schema') {
+            if (PMA_is_system_schema($tmp_row[0])) {
                 continue;
             }
             if (count($do_db) == 0) {
diff --git a/sql.php b/sql.php
index 6b67b96561dd..715f7f267c7d 100644
--- a/sql.php
+++ b/sql.php
@@ -795,7 +795,7 @@
         }
 
         // hide edit and delete links for information_schema
-        if ($db == 'information_schema') {
+        if (PMA_is_system_schema($db)) {
             $disp_mode = 'nnnn110111';
         }
         
@@ -907,7 +907,7 @@
     }
 
     // hide edit and delete links for information_schema
-    if (strtolower($db) == 'information_schema' || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
+    if (PMA_is_system_schema($db)) {
         $disp_mode = 'nnnn110111';
     }
 
diff --git a/tbl_printview.php b/tbl_printview.php
index 24949094aabc..942aa81bfe27 100644
--- a/tbl_printview.php
+++ b/tbl_printview.php
@@ -225,8 +225,7 @@
 </tbody>
 </table>
     <?php
-    if (! $tbl_is_view && strtolower($db) != 'information_schema'
-            && (!PMA_DRIZZLE || strtolower($db) != 'data_dictionary')) {
+    if (! $tbl_is_view && !PMA_is_system_schema($db)) {
         /**
          * Displays indexes
          */