Help Center/ Distributed Database Middleware/ User Guide/ Data Migration/ Scenario 6: Exporting Data from a DDM Instance
Updated on 2022-09-16 GMT+08:00
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Scenario 6: Exporting Data from a DDM Instance

  • Export table data during off-peak hours. This is because performance of the DDM instance and its associated RDS instances may be affected during the export.
  • Use mysqldump to dump database data on a large disk to ensure that there is enough disk space.
  • Run nohup {mysqldump CLI} & in Linux to ensure that mysqldump still works when a session times out.

Scenarios

Export data from a DDM instance to a SQL text file.

Export Table Structure

If the DDM version is 2.4.X or later, run the following command to export table structure:

  • If the MySQL client version is 5.6 or 5.7, run the following command: 
    mysqldump -h {DDM_ADDRESS} -P {DDM_PORT} -u {DDM_USER} -p --no-data --skip-lock-tables --default-auth=mysql_native_password --skip-tz-utc {DB_NAME} {TABLE_NAME} > {mysql_table_schema_ddm.sql}
  • If the MySQL client version is 8.0, run the following command: 
    mysqldump -h {DDM_ADDRESS} -P {DDM_PORT} -u {DDM_USER} -p --no-data --skip-lock-tables --default-auth=mysql_native_password --column-statistics=0 --skip-tz-utc {DB_NAME} {TABLE_NAME} > {mysql_table_schema_ddm.sql}

Export Table Data

If the DDM version is 2.4.X or later, run the following command to export table data:

mysqldump -h {DDM_ADDRESS} -P {DDM_PORT} -u {DDM_USER} -p --skip-lock-tables --add-locks=false --hex-blob --complete-insert --set-gtid-purged=OFF --quick --no-create-info --skip-comments [--where=""] --skip-tz-utc{DB_NAME} {TABLE_NAME} > {mysql_table_data_ddm.sql}
Parent topic: Data Migration