diff --git a/conf/mysql_credetials.conf.sample b/conf/mysql_credetials.conf.sample
index a5f10e3..da85025 100644
--- a/conf/mysql_credetials.conf.sample
+++ b/conf/mysql_credetials.conf.sample
@@ -5,7 +5,9 @@
 # ----------------------------------------------------
 
 
-# - MySQL / MariaDB credentials
+# - MySQL / MariaDB / Percona credentials
+
+# - mysql_credential_args
 # -
 # - Giving password on command line is insecure an sind mysql 5.5
 # - you will get a warning doing so.
@@ -31,4 +33,24 @@
 # -
 # - Defaults to mysql_credential_args="--login-path=local"
 # -
-mysql_credential_args=""
+#mysql_credential_args="--login-path=local"
+
+
+# - mysql_credential_args_arr
+# -
+# - If multiple MySQL / MariaDB / Percona Installations are present, for each installation, 
+# - you can give its own credentials.
+# - 
+# - Note:
+# -   If this parameter ist present, the parameter 'mysql_credential_args' will be ignored.
+# -
+# - Example
+# -   mysql_credential_args_arr="10.2.13:--defaults-file=/etc/mysql/debian.cnf 5.2.7:--login-path=local"
+# -   msql_credential_args_arr="5.6:--login-path=local-5.6 5.7:--login-path=local"
+# -
+# -
+# - Note:
+# -    the forst value (before the colon ':') is only user for logging output and has no
+# -    further relevance .
+# -
+#msql_credential_args_arr=""
diff --git a/optimize_mysql_tables.sh b/optimize_mysql_tables.sh
index ff6d827..b4f9423 100755
--- a/optimize_mysql_tables.sh
+++ b/optimize_mysql_tables.sh
@@ -3,14 +3,125 @@
 working_dir="$(dirname $(realpath $0))"
 conf_file="${working_dir}/conf/mysql_credetials.conf"
 
+tmp_log_file="$(mktemp)"
+
+
+# -------------
+# - Variable settings
+# -------------
+DEFAULT_MYSQL_CREDENTIAL_ARGS="--login-path=local"
+
+
+# -------------
+# --- Some functions
+# -------------
+
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -f $tmp_log_file
+   exit $1
+}
+
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "$*\\c" 1>&2
+      else
+         echo -e -n "$*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+
+
+fatal(){
+   echo ""
+   if $terminal ; then
+      if [[ -n "$*" ]] ; then
+         echo -e "   [ \033[31m\033[1mFatal\033[m ]: $*"
+         echo ""
+         echo -e "              \033[31m\033[1mScript will be interrupted.\033[m\033[m"
+      else
+         echo -e "   \033[31m\033[1mFatal error\033[m: \033[1mScript will be interrupted.\033[m"
+      fi
+   else
+      if [[ -n "$*" ]] ; then
+         echo "   [ Fatal ]: $*"
+         echo ""
+         echo "              Script was terminated.."
+      else
+         echo "   Fatal error: Script was terminated.."
+      fi
+   fi
+   echo ""
+   clean_up 1
+}
+
+
+error(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ]: $*"
+   else
+      echo "   [ Error ]: $*"
+   fi
+   echo ""
+}
+
+warn (){
+   if $terminal ; then
+      echo ""
+      echo -e "   [ \033[33m\033[1mWarning\033[m ]: $*"
+      echo ""
+   else
+      echo "   [ Warning ]: $*"
+   fi
+}
+
+info (){
+   if $terminal ; then
+      echo ""
+      echo -e "   [ \033[32m\033[1mInfo\033[m ]: $*"
+      echo ""
+   else
+      echo "   [ Info ]: $*"
+   fi
+}
+
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[80G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[80G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[80G[ \033[37mskipped\033[m ]"
+   fi
+}
+
+
+trap clean_up SIGHUP SIGINT SIGTERM
+
+
+
+
+
+
 # - Is this script running on terminal ?
 # -
 if [[ -t 1 ]] ; then
-      terminal=true
-      LOGGING=true
+   terminal=true
 else
    terminal=false
-   LOGGING=false
 fi
 
 mysql=`which mysql`
@@ -19,112 +130,154 @@ if [ -z "$mysql" ]; then
    if [ -x "/usr/local/mysql/bin/mysql" ]; then
       mysql=/usr/local/mysql/bin/mysql
    fi
+   fatal "No binary 'mysql' found!"
 fi
 
 
-#---------------------------------------
-#-----------------------------
-# Read Configurations from $conf_file
-#-----------------------------
-#---------------------------------------
 
+# -------------
+# - Load Settings from configuration file
+# -------------
+
+echo ""
+echononl "   Loading configuration settings from $(basename ${conf_file}).."
 if [[ -f "$conf_file" ]]; then
-   source "$conf_file"
+   source "$conf_file" > $tmp_log_file 2>&1
+   if [[ $? -eq 0 ]]; then
+      echo_ok
+   else
+      echo_failed
+      fatal "$(cat $tmp_log_file)"
+   fi
+else
+   echo_skipped
+   warn "No Configuration File found. Loading defaults.."
 fi
 
+
 [[ -z "$mysql_credential_args" ]] && mysql_credential_args="--login-path=local"
 
+if [[ ${#mysql_credential_args_arr[@]} -eq 0 ]]; then
+   [[ -z "$mysql_credential_args" ]] && mysql_credential_args="--login-path=local"
+   mysql_credential_args_arr="default:$mysql_credential_args"
+fi
+
+declare -i length_table_name
+declare -i number_blank_signd
+declare -i index_i
+for _val in ${mysql_credential_args_arr[@]} ; do
+
+   _all_success=true
+
+   IFS=':' read -a _val_arr <<< "${_val}"
+   mysql_version="${_val_arr[0]}"
+   mysql_credential_args="${_val_arr[1]}"
+
+   if $terminal ; then
+      echo ""
+      echo -e "[ \033[37m\033[1mMySQL $mysql_version\033[m ]: optimize (and repair) tables of databases at host '$(hostname -f)'."
+   fi
 
-if [ -n "$mysql_credential_args" ] ; then
    DATABASES=`$mysql $mysql_credential_args -N -s -e "show databases"`
-else
-   DATABASES=`$mysql -u$mysql_user -p$mysql_password -N -s -e "show databases"`
-fi
 
-if $terminal ; then
-   echo ""
-   echo "MySQL: optimize (and try to repair) tables of databases at host $(hostname -f)."
-   echo ""
-fi
+   length_table_name=0
+   for db in $DATABASES ; do
 
+      [ "$db" = "information_schema" ] && continue
+      [ "$db" = "performance_schema" ] && continue
+      [ "$db" = "mysql" ] && continue
 
-
-for db in $DATABASES ; do
-
-
-   [ "$db" = "information_schema" ] && continue
-   [ "$db" = "performance_schema" ] && continue
-   [ "$db" = "mysql" ] && continue
-
-   if $LOGGING ;then
-      echo -e "\n[`date`] Optimize tables in database $db.."
-   fi
-
-   if [ -n "$mysql_credential_args" ] ; then
-      TABLES=`$mysql $mysql_credential_args $db -N -s -e "show tables"`
-   else
-      TABLES=`$mysql -u$mysql_user -p$mysql_password $db -N -s -e "show tables"`
-   fi
-
-   for table in $TABLES ; do
-
-      if [ -n "$mysql_credential_args" ] ; then
-         if $LOGGING ;then
-            $mysql $mysql_credential_args  $db -N -s -e "OPTIMIZE TABLE \`$table\`"
-         else
-            $mysql $mysql_credential_args  $db -N -s -e "OPTIMIZE TABLE \`$table\`" > /dev/null 2>&1
-         fi
-      else
-         $mysql -u$mysql_user -p$mysql_password $db -N -s -e "OPTIMIZE TABLE \`$table\`" > /dev/null 2>&1
+      if $terminal ;then
+         echo ""
+         echo -e "   [$(date)] Optimize tables in database '${db}'.."
       fi
-      if [ "$?" != "0" ]; then
-         echo -e "\t[ Warning ]: Optimizing table \"${table}\" of database \"$db\" failed. Trying to repair.."
-         if [ -n "$mysql_credential_args" ] ; then
-            if $LOGGING ;then
-               $mysql $mysql_credential_args $db -N -s -e "REPAIR TABLE \`$table\`"
-            else
-               $mysql $mysql_credential_args $db -N -s -e "REPAIR TABLE \`$table\`" > /dev/null 2>&1
-            fi
-            if [ "$?" != "0" ]; then
-               echo -e "\t[ERROR]: Reparing table \"${table}\" of database \"$db\" failed !!"
-            else
-               if $LOGGING ;then
-                  $mysql $mysql_credential_args  $db -N -s -e "OPTIMIZE TABLE \`$table\`"
-               else
-                  $mysql $mysql_credential_args  $db -N -s -e "OPTIMIZE TABLE \`$table\`" > /dev/null 2>&1
-               fi
-               [[ $? -gt 0 ]] && echo -e "\t[ERROR]: Optimizing table \"${table}\" of database \"$db\" failed !!"
-            fi
-         else
-            if $LOGGING ;then
-               $mysql -u$mysql_user -p$mysql_password $db -N -s -e "REPAIR TABLE \`$table\`"
-            else
-               $mysql -u$mysql_user -p$mysql_password $db -N -s -e "REPAIR TABLE \`$table\`" > /dev/null 2>&1
-            fi
-            if [ "$?" != "0" ]; then
-               echo -e "\t[ERROR]: Reparing table \"${table}\" of database \"$db\" failed !!"
-            else
-               if $LOGGING ;then
-                  $mysql -u$mysql_user -p$mysql_password $db -N -s -e "OPTIMIZE TABLE \`$table\`"
-               else
-                  $mysql -u$mysql_user -p$mysql_password $db -N -s -e "OPTIMIZE TABLE \`$table\`" > /dev/null 2>&1
-               fi
-               [[ $? -gt 0 ]] && echo -e "\t[ERROR]: Optimizing table \"${table}\" of database \"$db\" failed !!"
+
+      TABLES=`$mysql $mysql_credential_args $db -N -s -e "show tables"`
+
+      for table in $TABLES ; do
+         
+
+         if $terminal ; then
+            #echo -en "\033[1G   \033[32mOptimize table \033[1m$table\033[m                              \033[1G"
+            #echo -en "\033[1G   \033[32mOptimize table \033[1m$table\033[m"
+            blank_signs=""
+            if [[ $length_table_name -gt ${#table} ]]; then
+               number_blank_sign=$(expr $length_table_name - ${#table})
+               index_i=0
+               while [[ $index_i -lt $number_blank_sign ]] ; do
+                  blank_signs="$blank_signs "
+                  (( index_i++ ))
+               done
+               echo -en "\033[1G"
             fi
+            echo -en "\033[1G   \033[32mOptimize table \033[1m$table\033[m$blank_signs\033[1G"
          fi
+         length_table_name=${#table}
+
+         $mysql $mysql_credential_args  $db -N -s -e "OPTIMIZE TABLE \`$table\`" > $tmp_log_file 2>&1
+
+
+         if [[ $? -ne 0 ]]; then
+
+            warn "Optimizing table \"${table}\" of database \"$db\" failed. Trying to repair.."
+
+            $mysql $mysql_credential_args $db -N -s -e "REPAIR TABLE \`$table\`" > $tmp_log_file 2>&1
+
+            if [[ $? -ne 0 ]]; then
+
+               _all_success=false
+               error "Repairing table '$table' failed.\n$(cat "$tmp_log_file")"
+               error_messages_arr+=("MySQL $mysql_version: Error while repairing table '${table}' of database '$db'.")
+
+            else
+
+               $mysql $mysql_credential_args  $db -N -s -e "OPTIMIZE TABLE \`$table\`" > $tmp_log_file 2>&1
+
+               if [[ $? -ne 0 ]]; then
+                  error "Reoptimizing table \"${table}\" of database \"$db\" failed.\n$(cat "$tmp_log_file")"
+                  error_messages_arr+=("MySQL $mysql_version: Error while (re-)optimizing table '${table}' of database '$db'.")
+               else
+                  info "Reoptimizing table \"${table}\" of database \"$db\" was successfully."
+               fi
+            fi
+            echo ""
+
+         fi
+
+      done
+
+      if $terminal ;then
+         echo -en "\033[1G   [$(date)] End optimize tables in database '${db}'.."
+         echo
       fi
 
    done
-   if $LOGGING ;then
-      echo -e "\n[`date`] End optimize tables in database $db.."
+
+   if $_all_success ; then
+      info_messages_arr+=("MySQL $mysql_version: The optimization of the MySQL tables of all databases was successful.")
    fi
 
+   if $terminal ; then
+      echo ""
+      echo -e "[ \033[37m\033[1mMySQL $mysql_version\033[m ]: Finished optimizing MySQL databases at host $(hostname -f)."
+      echo ""
+   fi
 done
 
-if $terminal ; then
-   echo ""
-   echo "Finished optimizing MySQL databases at host $(hostname -f)."
-   echo ""
+if [[ ${#info_messages_arr[@]} -gt 0 ]]; then
+   for msg in "${info_messages_arr[@]}" ; do
+      if $terminal ; then
+         info "$msg"
+      fi
+   done
 fi
 
-exit 0
+if [[ ${#error_messages_arr[@]} -gt 0 ]]; then
+   for msg in "${error_messages_arr[@]}" ; do
+      if $terminal ; then
+         error "$msg"
+      fi
+   done
+fi
+
+clean_up 0