How to load data from ClickHouse to Clickhouse
Learn how to use Airbyte to synchronize your ClickHouse data into Clickhouse within minutes.
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How to Sync to Manually
Step 1: Prepare Source and Destination Environments
Ensure both the source and destination ClickHouse instances are set up and accessible. Verify that you have the necessary permissions to read data from the source and write to the destination. Make sure both ClickHouse servers are running compatible versions to prevent any compatibility issues.
Step 2: Identify Data to Transfer
Determine which tables and databases need to be transferred. Document the schema and any dependencies, such as views or materialized views. This step is crucial for ensuring that all necessary data is moved and that the schema will be correctly recreated on the destination.
Step 3: Export Data from Source
Use ClickHouse's native `CLICKHOUSE` command-line client to export data. You can use the `SELECT ... INTO OUTFILE` syntax to export data from the source database into a CSV or TSV file. For example:
```bash
clickhouse-client --host= --query="SELECT * FROM .
" --format=TSV > /path/to/exported_data.tsv
```
Ensure the exported file is stored in a location accessible for transfer.
Step 4: Transfer Exported Files
Use secure file transfer methods such as `scp` or `rsync` to transfer the exported data files from the source server to the destination server. Ensure file permissions are set correctly to allow reading by the ClickHouse process on the destination server.
```bash
scp /path/to/exported_data.tsv user@destination_host:/path/to/destination/
```
Step 5: Recreate Schema on Destination
Before importing data, recreate the database schema on the destination ClickHouse instance. Use the `SHOW CREATE TABLE` command on the source to get the schema definition and execute it on the destination. This ensures that tables are created with the correct structure.
```bash
clickhouse-client --host= --query="SHOW CREATE TABLE .
"
# Execute the output on the destination server.
```
Step 6: Import Data into Destination
Use the `clickhouse-client` to import the exported data into the corresponding tables on the destination server using the `INSERT INTO ... FORMAT` syntax. For example:
```bash
clickhouse-client --host= --query="INSERT INTO .
FORMAT TSV" < /path/to/destination/exported_data.tsv
```
Ensure the data formats match and that any necessary transformations are applied during the import.
Step 7: Verify Data Integrity
After the data has been imported, perform integrity checks to ensure that the data was transferred correctly. Compare row counts and checksums between the source and destination to verify consistency. Use queries like:
```bash
clickhouse-client --host= --query="SELECT count(*) FROM .
"
clickhouse-client --host= --query="SELECT count(*) FROM ."
```
This step ensures the data transfer was successful and complete.
By following these steps, you can effectively transfer data between ClickHouse instances without relying on third-party connectors or integrations.