diff --git a/lib/core/convert.py b/lib/core/convert.py
index dbcbb233b..9e88d3e73 100644
--- a/lib/core/convert.py
+++ b/lib/core/convert.py
@@ -11,7 +11,6 @@ import pickle
 import re
 import StringIO
 import sys
-import types
 
 from lib.core.settings import IS_WIN
 from lib.core.settings import UNICODE_ENCODING
diff --git a/lib/core/settings.py b/lib/core/settings.py
index daaa803a0..4799bcf4e 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -10,7 +10,6 @@ import re
 import subprocess
 import string
 import sys
-import time
 import types
 
 from lib.core.datatype import AttribDict
@@ -20,7 +19,7 @@ from lib.core.enums import OS
 from lib.core.revision import getRevisionNumber
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.0.4.19"
+VERSION = "1.0.4.20"
 REVISION = getRevisionNumber()
 STABLE = VERSION.count('.') <= 2
 VERSION_STRING = "sqlmap/%s#%s" % (VERSION, "stable" if STABLE else "dev")
diff --git a/lib/core/wordlist.py b/lib/core/wordlist.py
index 13e763b17..2ba368777 100644
--- a/lib/core/wordlist.py
+++ b/lib/core/wordlist.py
@@ -11,7 +11,6 @@ import zipfile
 from lib.core.common import getSafeExString
 from lib.core.exception import SqlmapDataException
 from lib.core.exception import SqlmapInstallationException
-from lib.core.settings import UNICODE_ENCODING
 
 class Wordlist(object):
     """
diff --git a/lib/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index 41b54d7ca..20a96474e 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -5,11 +5,9 @@ Copyright (c) 2006-2016 sqlmap developers (http://sqlmap.org/)
 See the file 'doc/COPYING' for copying permission
 """
 
-import re
 import threading
 import time
 
-from extra.safe2bin.safe2bin import safechardecode
 from extra.safe2bin.safe2bin import safecharencode
 from lib.core.agent import agent
 from lib.core.common import Backend
@@ -20,13 +18,11 @@ from lib.core.common import decodeIntToUnicode
 from lib.core.common import filterControlChars
 from lib.core.common import getCharset
 from lib.core.common import getCounter
-from lib.core.common import getUnicode
 from lib.core.common import goGoodSamaritan
 from lib.core.common import getPartRun
 from lib.core.common import hashDBRetrieve
 from lib.core.common import hashDBWrite
 from lib.core.common import incrementCounter
-from lib.core.common import randomInt
 from lib.core.common import safeStringFormat
 from lib.core.common import singleTimeWarnMessage
 from lib.core.data import conf
@@ -44,7 +40,6 @@ from lib.core.settings import INFERENCE_UNKNOWN_CHAR
 from lib.core.settings import INFERENCE_GREATER_CHAR
 from lib.core.settings import INFERENCE_EQUALS_CHAR
 from lib.core.settings import INFERENCE_NOT_EQUALS_CHAR
-from lib.core.settings import MIN_TIME_RESPONSES
 from lib.core.settings import MAX_BISECTION_LENGTH
 from lib.core.settings import MAX_TIME_REVALIDATION_STEPS
 from lib.core.settings import NULL
diff --git a/lib/utils/search.py b/lib/utils/search.py
index 116b3cb01..1f54deac1 100644
--- a/lib/utils/search.py
+++ b/lib/utils/search.py
@@ -5,7 +5,6 @@ Copyright (c) 2006-2016 sqlmap developers (http://sqlmap.org/)
 See the file 'doc/COPYING' for copying permission
 """
 
-import cookielib
 import httplib
 import re
 import socket
@@ -26,7 +25,6 @@ from lib.core.enums import HTTP_HEADER
 from lib.core.enums import REDIRECTION
 from lib.core.exception import SqlmapBaseException
 from lib.core.exception import SqlmapConnectionException
-from lib.core.exception import SqlmapGenericException
 from lib.core.exception import SqlmapUserQuitException
 from lib.core.settings import DUMMY_SEARCH_USER_AGENT
 from lib.core.settings import DUCKDUCKGO_REGEX
@@ -35,7 +33,6 @@ from lib.core.settings import GOOGLE_REGEX
 from lib.core.settings import HTTP_ACCEPT_ENCODING_HEADER_VALUE
 from lib.core.settings import UNICODE_ENCODING
 from lib.request.basic import decodePage
-from lib.request.httpshandler import HTTPSHandler
 from thirdparty.socks import socks
 
 
diff --git a/plugins/generic/databases.py b/plugins/generic/databases.py
index d35ff8b7a..a242463a4 100644
--- a/plugins/generic/databases.py
+++ b/plugins/generic/databases.py
@@ -572,7 +572,11 @@ class Databases:
                                             query = _.query % (unsafeSQLIdentificatorNaming(conf.db.upper()), unsafeSQLIdentificatorNaming(tbl.upper()), unsafeSQLIdentificatorNaming(name.upper()))
                                         else:
                                             query = _.query % (unsafeSQLIdentificatorNaming(conf.db), unsafeSQLIdentificatorNaming(tbl), unsafeSQLIdentificatorNaming(name))
+
                                         comment = unArrayizeValue(inject.getValue(query, blind=False, time=False))
+                                        if not isNoneValue(comment):
+                                            infoMsg = "retrieved comment '%s' for column '%s'" % (comment, name)
+                                            logger.info(infoMsg)
                                     else:
                                         warnMsg = "on %s it is not " % Backend.getIdentifiedDbms()
                                         warnMsg += "possible to get column comments"
@@ -702,7 +706,11 @@ class Databases:
                                     query = _.query % (unsafeSQLIdentificatorNaming(conf.db.upper()), unsafeSQLIdentificatorNaming(tbl.upper()), unsafeSQLIdentificatorNaming(column.upper()))
                                 else:
                                     query = _.query % (unsafeSQLIdentificatorNaming(conf.db), unsafeSQLIdentificatorNaming(tbl), unsafeSQLIdentificatorNaming(column))
+
                                 comment = unArrayizeValue(inject.getValue(query, union=False, error=False))
+                                if not isNoneValue(comment):
+                                    infoMsg = "retrieved comment '%s' for column '%s'" % (comment, column)
+                                    logger.info(infoMsg)
                             else:
                                 warnMsg = "on %s it is not " % Backend.getIdentifiedDbms()
                                 warnMsg += "possible to get column comments"
diff --git a/tamper/commalesslimit.py b/tamper/commalesslimit.py
index 570c2ebdf..5f3e60411 100644
--- a/tamper/commalesslimit.py
+++ b/tamper/commalesslimit.py
@@ -5,10 +5,8 @@ Copyright (c) 2006-2016 sqlmap developers (http://sqlmap.org/)
 See the file 'doc/COPYING' for copying permission
 """
 
-import os
 import re
 
-from lib.core.common import singleTimeWarnMessage
 from lib.core.enums import PRIORITY
 
 __priority__ = PRIORITY.HIGH
diff --git a/tamper/escapequotes.py b/tamper/escapequotes.py
index 5a3acadfb..714c34ccd 100644
--- a/tamper/escapequotes.py
+++ b/tamper/escapequotes.py
@@ -5,10 +5,7 @@ Copyright (c) 2006-2016 sqlmap developers (http://sqlmap.org/)
 See the file 'doc/COPYING' for copying permission
 """
 
-import base64
-
 from lib.core.enums import PRIORITY
-from lib.core.settings import UNICODE_ENCODING
 
 __priority__ = PRIORITY.LOWEST