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Import Between TDSQL Instances
The solution for data importing from one distributed database to another is special. mysqldump is used as an example below to summarize the importing steps:
1. Install mysqldump (for MariaDB)
Purchase a Linux CVM instance and run
yum install mariadb-server to install mysqldump.2. Export the table structure
mysqldump --compact --single-transaction -d -uxxx -pxxx -hxxx.xxx.xxx.xxx -Pxxxx db_name table_name > schema.sql
Note:
Please select the
db_name and table_name parameters as needed.3. Export data
Export data by using mysqldump:
Set the
net_write_timeout parameter in the parameter settings in the TDSQL for MySQL Console: set global net_write_timeout=28800mysqldump --compact --single-transaction --no-create-info -c -uxxx -pxxx -hxxx.xxx.xxx.xxx -Pxxxx db_name table_name > data.sql
Note:
The
db_name and table_name parameters should be selected as needed. If the exported data is to be imported into another set of TDSQL for MySQL environment, the -c option must be added, and there should be a space between -c and db_name.
4. Create a database in the target instance
mysql --default-character-set=utf8 -uxxx -pxxx -hxxx.xxx.xxx.xxx -Pxxxx -e "create database dbname;";
--default-character-set=utf8: set based on your target table.
-uxxx: a privileged account (
-u is a keyword).-pxxx: password (
-p is a keyword).-hxxx.xxx.xxx.xxx -Pxxxx: IP and port of the database instance.
dbname: database name.
5. Import the table structure into the target instance
mysql --default-character-set=utf8 -uxxx -pxxx -hxxx.xxx.xxx.xxx -Pxxxx dbname < schema.sql
--default-character-set=utf8: set based on your target table.
-uxxx: a privileged account (
-u is a keyword).-pxxx: password (
-p is a keyword).-hxxx.xxx.xxx.xxx -Pxxxx: IP and port of the database instance.
dbname: database name.
6. Import table data into the target instance
mysql --default-character-set=utf8 -uxxx -pxxx -hxxx.xxx.xxx.xxx -Pxxxx dbname < data.sql
Note:
If an auto-increment field is used in the source table, and the "Column 'xx' specified twice" error occurs during import, the
schema.sql needs to be processed.
Remove the back quotes from the auto-increment field (cat schema.sql | tr "" " " > schema_tr.sql), drop database, and repeat steps 3–5 by using the processed schema_tr.sql`.
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