diff -r d6088dba8fea -r 2a2d0d5df03b pgtoolkit/tools/bigtables.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pgtoolkit/tools/bigtables.py	Tue May 06 18:37:43 2014 +0200
@@ -0,0 +1,55 @@
+from pgtoolkit.toolbase import SimpleTool
+from pgtoolkit import pgbrowser
+from pycolib.prettysize import prettysize_short
+from pycolib.ansicolor import highlight
+
+
+class BigTablesTool(SimpleTool):
+
+    """List largest tables.
+
+    Reads size statistics of tables and indexes from pgcatalog.
+
+    """
+
+    def __init__(self):
+        SimpleTool.__init__(self, name='bigtables')
+
+    def specify_args(self):
+        SimpleTool.specify_args(self)
+        self.parser.add_argument('-n', '--limit', metavar='NUM', dest='limit', type=int, default=5, help='Show NUM biggest tables.')
+        self.parser.add_argument('-v', '--details', dest='details', action='store_true', help='Show sizes of data and individual indexes.')
+
+    def main(self):
+        browser = pgbrowser.PgBrowser(self.pgm.get_conn('target'))
+
+        # scan all tables from all shemas, remember names and sizes
+        all_tables = []
+        all_indexes = []
+        schemas = browser.list_schemas()
+        for schema in schemas:
+            tables = browser.list_tables(schema['name'])
+            for table in tables:
+                table_name = '%s.%s' % (schema['name'], table['name'])
+                indexes = browser.list_indexes(table['name'], schema['name'])
+                for index in indexes:
+                    all_indexes.append({'name': index['name'], 'table': table_name, 'size': index['size']})
+                all_tables.append({'name': table_name, 'size': table['size'], 'indexes': indexes})
+
+        # print names and sizes of 20 largest tables
+        for table in sorted(all_tables, reverse=True, key=lambda x: x['size'])[:self.args.limit]:
+            size_of_indexes = sum(index['size'] for index in table['indexes'])
+            print(highlight(1) + prettysize_short(table['size'] + size_of_indexes, trailing_zeros=True).rjust(8) + highlight(0),
+                  '(total)'.ljust(8),
+                  highlight(1) + table['name'] + highlight(0), sep='  ')
+            if self.args.details:
+                print(prettysize_short(table['size'], trailing_zeros=True).rjust(8),
+                      '(data)'.ljust(8), sep='  ')
+                for index in sorted(table['indexes'], reverse=True, key=lambda x: x['size']):
+                    print(prettysize_short(index['size'], trailing_zeros=True).rjust(8),
+                          '(index)'.ljust(8), index['name'], sep='  ')
+            print()
+
+
+cls = BigTablesTool
+