diff --git a/install_mysql.sh b/install_mysql.sh
index 6624b3b..205b6a1 100755
--- a/install_mysql.sh
+++ b/install_mysql.sh
@@ -1999,6 +1999,48 @@ if $UPDATE_MYSQL ; then
 
    if [[ ! -f "${MYSQL_INSTALL_DIR}/my.cnf" ]] ; then
       _new_cnf_needed=true
+   else
+
+      if [[ "$MYSQL_MAJOR_VERSION" -gt 5 ]]  \
+         ||  ( [[ "$MYSQL_MAJOR_VERSION" -eq 5 ]] && [[ "$MYSQL_MINOR_VERSION" -ge 7 ]] ) ; then
+         proof_var="thread_concurrency"
+         echononl "Deaktivire '${proof_var} .."
+         if grep -q -E "^\s*${proof_var}.*" "${MYSQL_INSTALL_DIR}/my.cnf" 2> /dev/null ; then
+            echo "" >> ${logdir}/main.log
+            echo "## - Deaktivire '${proof_var} .." >> ${logdir}/main.log
+            echo "## -" >> ${logdir}/main.log
+            echo "perl -i -n -p -e \"s/^(\s*)(${proof_var}.*)/#\1\2/\" \"${MYSQL_INSTALL_DIR}/my.cnf\"" >> ${logdir}/main.log
+            perl -i -n -p -e "s/^(\s*)(${proof_var}.*)/#\1\2/" "${MYSQL_INSTALL_DIR}/my.cnf" >> ${logdir}/main.log 2>&1
+            if [ "$?" = "0" ]; then
+               echo_ok
+            else
+               echo_failed
+               warn "Konnte '${proof_var}' nicht deaktivieren."
+            fi
+         else
+            echo_skipped
+         fi
+
+         proof_var="innodb_additional_mem_pool_size"
+         echononl "Deaktivire '${proof_var} .."
+         if grep -q -E "^\s*${proof_var}.*" "${MYSQL_INSTALL_DIR}/my.cnf" 2> /dev/null ; then
+            echo "" >> ${logdir}/main.log
+            echo "## - Deaktivire '${proof_var} .." >> ${logdir}/main.log
+            echo "## -" >> ${logdir}/main.log
+            echo "perl -i -n -p -e \"s/^(\s*)(${proof_var}.*)/#\1\2/\" \"${MYSQL_INSTALL_DIR}/my.cnf\"" >> ${logdir}/main.log
+            perl -i -n -p -e "s/^(\s*)(${proof_var}.*)/#\1\2/" "${MYSQL_INSTALL_DIR}/my.cnf" >> ${logdir}/main.log 2>&1
+            if [ "$?" = "0" ]; then
+               echo_ok
+            else
+               echo_failed
+               warn "Konnte '${proof_var}' nicht deaktivieren."
+            fi
+         else
+            echo_skipped
+         fi
+
+      fi # if [[ "$MYSQL_MAJOR_VERSION" -lt 5 ]] || ...
+
    fi
 fi
 
@@ -3852,6 +3894,16 @@ if $INSTALL_SYSTEMD_SERVICE ; then
    else
       echo_failed
       error Konnte MySQL Datenbankserver nicht starten..
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/nno]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+
    fi
 else
    if $SYSTEMD_EXISTS ; then
@@ -3866,6 +3918,16 @@ else
    else
       echo_failed
       error Konnte MySQL Datenbankserver nicht starten..
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/nno]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+
    fi
 fi