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What are the ways to copy data from one (source) table to another (destination) table?
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SingleStore provides several methods to copy data from a source table to a destination table:
1. S3 Pipelines
You can export the source table data to an S3 bucket and then import it into the target table using an S3 pipeline.
2. CREATE TABLE ... SELECT (CTAS)
CREATE TABLE <destination_table> AS
SELECT * FROM <source_table>;
This method is suitable for small tables. For large tables, it can consume significant resources (disk, memory, and CPU), so it should be used cautiously.
3. INSERT INTO ... SELECT
INSERT INTO <destination_table>
SELECT * FROM <source_table>
WHERE <condition>;
For large datasets, executing a single massive INSERT INTO ... SELECT can lead to disk or memory exhaustion. It's recommended to use multiple smaller INSERT INTO ... SELECT statements with appropriate filtering (e.g., LIMIT and OFFSET) to minimize resource usage.
4. Stored Procedure
A stored procedure can be written to iterate through the source table in manageable chunks, enabling efficient and controlled data copying.
5. mysqldump
You can use the mysqldump tool to export data from the source table and import it into the destination table, especially in migration or backup/restore scenarios.
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