As the distributed architecture of a distributed database is imperceptible to the user, in general, only the table structure needs to be created in advance, and you can then migrate data using a MySQL client such as mysqldump, Navicat, or SQLyog in the following steps:
Step 1. Prepare the import and export environments
Step 2. Export the table structure and data of the source table
Step 3. Modify the statement for table creation and create a table structure in the target table
Step 4. Import data
Before migrating data, you need to get the following prepared:
mysqldump -u username -p password -d dbname tablename > tablename.sql to export the table structure
// Command instance mysqldump -utest -ptest1234 -d -S /data/4003/prod/mysql.scok caccts t_acct_water_0 > table.sql
mysqldump -c -u username -p password dbname tablename > tablename.sql to export the table data.
// Command instance mysqldump -c -t -utest -ptest1234 -S /data/4003/prod/mysql.scok caccts t_acct_water_0 > data.sql
Data must be exported using mysqldump with the
-cparameter appended, because only in this way can all the exported data rows have a column name field. SQL data rows with no column name field will be rejected by TDSQL for Percona or MariaDB.
-tindicates to export the table data only but not the table structure.
Before uploading files, you need to enable the public IP address of the CVM instance. Then, upload at least the following files just exported as instructed in Uploading Files to Linux CVM Through SCP:
Open the exported table structure file
table.sql, add the primary key and shardkey through statements like the following ones, and save it as
CREATE TABLE（ column name 1 data type, column name 2 data type, column name 3 data type, ....， PRIMARY KEY('column name n')) ENGINE=INNODB DEFAULT CHARSET=xxxx shardkey=keyname
Primary key and shardkey must be set. Pay attention to the table name case sensitivity. You are recommended to delete redundant comments; otherwise, the table may not be created successfully.
On the CVM instance, run
mysql -u username -p password -h IP -P port to log in to the MySQL server, and run
use dbname to enter the database.
You may need to create a database first.
Use the uploaded files to import data by running the
source /file path/tablenew.sql
source /file path/data.sql
select count(*) from tablename
You need to import the table creation statements first and then import the data. You can also import the .sql files directly through MySQL's
Generally, you can import data smoothly as long as you have created the corresponding table structure with the shardkey specified in the target table before importing data.