Data Loading With load_from_s3

Overview

MariaDB Enterprise ColumnStore includes a stored procedure called columnstore_info.load_from_s3, which can load data from a plain-text file containing delimiter-separated values (such as CSV or TSV) stored on S3-compatible cloud object storage.

Compatibility

Available from MariaDB Enterprise ColumnStore 23.02.

System Variables

Before you import data with the columnstore_info.load_from_s3 stored procedure, the authentication credentials and the region can be configured using system variables:

• columnstore_s3_key

• columnstore_s3_secret

• columnstore_s3_region

For example, the following statements show how to set the system variables for your current session:

SET columnstore_s3_key='S3_KEY';
SET columnstore_s3_secret='S3_SECRET';
SET columnstore_s3_region='S3_REGION';

Import Data

To import data with the columnstore_info.load_from_s3 stored procedure, use the CALL statement:

CALL columnstore_info.load_from_s3('BUCKET_URL',
      'FILE_NAME',
      'DATABASE_NAME',
      'TABLE_NAME',
      'TERMINATED_BY',
      'ENCLOSED_BY',
      'ESCAPED_BY');

• Replace 'BUCKET_URL' with the URL of your bucket. The protocol in the URL must be s3: for AWS S3 or gs: for Google Cloud Storage

• Replace 'FILE_NAME' with the file name to load from. The file must be a plain-text file containing delimiter-separated values, such as a comma-separated values (CSV) or tab-separated values (TSV) file. The supported file format is similar to the plain-text file formats supported by cpimport and LOAD DATA [LOCAL] INFILE. Please note that this stored procedure can't load dump files created by mariadb-dump

• Replace 'DATABASE_NAME' with the database to import into

• Replace 'TABLE_NAME' with the table name to import into

• Replace 'TERMINATED_BY' with the field terminator used in the file, similar to the -s command-line option for cpimport

• Replace 'ENCLOSED_BY' with the quotes used in the file, similar to the -E command-line option for cpimport

• Replace 'ESCAPED_BY' with the escape character used in the file, similar to the -C command-line option for cpimport

All parameters are mandatory.

For example, to load a comma-separated values (CSV) file from AWS S3:

CALL columnstore_info.load_from_s3('s3://mariadb-columnstore-test-data/',
   'test-data-db1-tab1.csv',
   'db1',
   'tab1',
   ',',
   '"',
   '\\');

When the stored procedure completes, it returns JSON containing the status of the operation. If the JSON shows an error or "success": false, check your table to see if some or all of your data was loaded, because many errors are non-fatal.

Permissions

When the data file is stored in Amazon S3, the AWS user only requires the s3:GetObject action on the bucket.

For example, the AWS user can use a user policy like the following:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "readBucket",
            "Effect": "Allow",
            "Action": [
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket",
                "arn:aws:s3:::my-bucket/*"
            ]
        }
    ]
}

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