Bulk data load from files

This page describes the steps to import data in CSV or TEXT format from flat files on your local disk or in cloud storage, including AWS S3, GCS buckets, and Azure Blob.

Prerequisite

• Before you perform a bulk load, in your target YugabyteDB database, create the schema of the tables into which the data in the flat files will be imported.

Import data files from the local disk

If your data files are in CSV or TEXT format and are present on the local disk, and you have already created a schema in your target YugabyteDB database, you can use the following yb-voyager import data file command to load the data into the target table directly from the flat file(s).

# Replace the argument values with those applicable to your migration.
yb-voyager import data file --export-dir <EXPORT_DIR> \
       --target-db-host <TARGET_DB_HOST> \
       --target-db-user <TARGET_DB_USER> \
       --target-db-password <TARGET_DB_PASSWORD> \ # Enclose the password in single quotes if it contains special characters.
       --target-db-name <TARGET_DB_NAME> \
       --target-db-schema <TARGET_DB_SCHEMA> \
       --data-dir </path/to/files/dir/> \
       --file-table-map <filename1>:<table1>,<filename2>:<table2> \
       --format csv|text \ # default csv
       # Optional arguments as per data format
       --delimiter <DELIMITER> \ # default ',' for csv and '\t' for text
       --escape-char <ESCAPE_CHAR> \ # for csv format only. default: '"'
       --quote-char <QUOTE_CHAR> \ # for csv format only. default: '"'
       --has-header \ # for csv format only. default: false
       --null-string <NULL_STRING> # default '' (empty string) for csv and '\N'  for text

Refer to import data file for details about the arguments.

Load multiple files into the same table

The import data file command also supports importing multiple files to the same table by providing the --file-table-map flag with a <fileName>:<tableName> entry for each file, or by passing a glob expression in place of the file name. For example, fileName1:tableName,fileName2:tableName or fileName*:tableName.

Incremental data loading

You can also import files to the same table across multiple runs. For example, you could import orders1.csv as follows:

yb-voyager import data file --file-table-map 'orders1.csv:orders' ...

And then subsequently import orders2.csv to the same table as follows:

yb-voyager import data file --file-table-map 'orders2.csv:orders' ...

To import an updated version of the same file (that is, having the same file name and data-dir), use the --start-clean flag and proceed without truncating the table. yb-voyager ingests the data present in the file in upsert mode. For example:

yb-voyager import data file --data-dir /dir/data-dir --file-table-map 'orders.csv:orders' ...

After new rows are added to orders.csv, use the following command to load them with --start-clean:

yb-voyager import data file --data-dir /dir/data-dir --file-table-map 'orders.csv:orders' --start-clean ...`

For details about the argument, refer to the arguments table.

Import data files from cloud storage

Using the import data file command, you can import data from files in cloud storage, including AWS S3, GCS buckets, and Azure blob. Importing from cloud storage reduces local disk requirements for storing the data while it is imported to your YugabyteDB database.

• AWS S3
• GCS buckets
• Azure blob

yb-voyager import data file .... \
        --data-dir s3://voyager-data

yb-voyager import data file .... \
        --data-dir gs://voyager-data

yb-voyager import data file .... \
        --data-dir https://<account_name>.blob.core.windows.net/<container_name>...