1

I'm trying to run a bash script to backup my database with Cronjob.

# Backup and compress each database
for database in $mysql_databases
do
  if [ "${database}" == "information_schema" ] || [ "${database}" == "performance_schema" ]; then
        additional_mysqldump_params1="--single-transaction"
  else
        additional_mysqldump_params=""
  fi
  echo "Creating backup of \"${database}\" database"
  mysqldump ${additional_mysqldump_params} --user=${mysql_user} --password=${mysql_password} ${database} | gzip > "${backup_dir}/${database}.gz"
  chmod 600 "${backup_dir}/${database}.gz" ${additional_mysqldump_params1}
done

but the --single-transaction option is not recognized

1 Answer 1

2

OBSERVATION #1

It is not recognized because of a typo

You have

  if [ "${database}" == "information_schema" ] || [ "${database}" == "performance_schema" ]; then
        additional_mysqldump_params1="--single-transaction"
  else
        additional_mysqldump_params=""
  fi

It should be

  if [ "${database}" == "information_schema" ] || [ "${database}" == "performance_schema" ]; then
        additional_mysqldump_params="--single-transaction"
  else
        additional_mysqldump_params=""
  fi

Please change the additional_mysqldump_params1 to additional_mysqldump_params

OBSERVATION #2

You have

chmod 600 "${backup_dir}/${database}.gz" ${additional_mysqldump_params1}

It should read

chmod 600 "${backup_dir}/${database}.gz"

Please remove additional_mysqldump_params1 from that line of code

OBSERVATION #3

There is no need to mysqldump information_schema or performance_schema databases

  • The INFORMATION_SCHEMA database is made of up in-memory temporary tables. They are dynamically generated and populated on mysqld startyo.
  • The PERFORMANCE_SCHEMA database is for the instrumentation of measuring performance. Each individual MySQL instance is responsible for populating it with instrumentation data when it is in use.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.