Amazon Web Services
SQreamDB uses a native Amazon Simple Storage Services (S3) connector for inserting data. The s3:// URI specifies an external file path to an S3 bucket. File names may contain wildcard characters, and the files can be in CSV or columnar format, such as Parquet and ORC.
S3 URI Format
With S3, specify a location for a file (or files) when using COPY FROM or Foreign Tables.
The following is an example of the general S3 syntax:
s3://bucket_name/path
Granting Access to S3
A best practice for granting access to AWS S3 is by creating an Identity and Access Management (IAM) user account. If creating an IAM user account is not possible, you may follow AWS guidelines for using the global configuration object and setting an AWS region.
Connecting to S3 Using SQreamDB Legacy Configuration File
You may use the following parameters within your SQreamDB legacy configuration file:
Parameter |
Description |
Parameter Value |
Example |
|---|---|---|---|
|
Overrides the AWS S3 HTTP endpoint when using Virtual Private Cloud (VPC) |
|
sqream_config_legacy.json:
{
...,
"AwsEndpointOverride": "https://my.endpoint.local"
}
|
|
Enables configuration of S3 object access styles, which determine how you can access and interact with the objects stored in an S3 bucket |
|
sqream_config_legacy.json:
{
...,
"AwsObjectAccessStyle": "path"
}
|
Authentication
SQreamDB supports AWS ID and AWS SECRET authentication. These should be specified when executing a statement.
Examples
Use a foreign table to stage data from S3 before loading from CSV, Parquet, or ORC files.
Creating a Foreign Table
Based on the source file’s structure, you can create a foreign table with the appropriate structure, and point it to your file as shown in the following example:
CREATE FOREIGN TABLE nba
(
Name text(40),
Team text(40),
Number tinyint,
Position text(2),
Age tinyint,
Height text(4),
Weight real,
College text(40),
Salary float
)
WRAPPER csv_fdw
OPTIONS
(
LOCATION = 's3://sqream-demo-data/nba_players.csv',
RECORD_DELIMITER = '\r\n' -- DOS delimited file
)
;
In the example above the file format is CSV, and it is stored as an S3 object. If the path is on HDFS, you must change the URI accordingly. Note that the record delimiter is a DOS newline (\r\n).
For more information, see the following:
Querying Foreign Tables
The following shows the data in the foreign table:
t=> SELECT * FROM nba LIMIT 10;
name | team | number | position | age | height | weight | college | salary
--------------+----------------+--------+----------+-----+--------+--------+-------------------+---------
Avery Bradley | Boston Celtics | 0 | PG | 25 | 6-2 | 180 | Texas | 7730337
Jae Crowder | Boston Celtics | 99 | SF | 25 | 6-6 | 235 | Marquette | 6796117
John Holland | Boston Celtics | 30 | SG | 27 | 6-5 | 205 | Boston University |
R.J. Hunter | Boston Celtics | 28 | SG | 22 | 6-5 | 185 | Georgia State | 1148640
Jonas Jerebko | Boston Celtics | 8 | PF | 29 | 6-10 | 231 | | 5000000
Amir Johnson | Boston Celtics | 90 | PF | 29 | 6-9 | 240 | | 12000000
Jordan Mickey | Boston Celtics | 55 | PF | 21 | 6-8 | 235 | LSU | 1170960
Kelly Olynyk | Boston Celtics | 41 | C | 25 | 7-0 | 238 | Gonzaga | 2165160
Terry Rozier | Boston Celtics | 12 | PG | 22 | 6-2 | 190 | Louisville | 1824360
Marcus Smart | Boston Celtics | 36 | PG | 22 | 6-4 | 220 | Oklahoma State | 3431040
Bulk Loading a File from a Public S3 Bucket
The COPY FROM command can also be used to load data without staging it first.
The bucket must be publicly available and objects must be listed.
COPY nba FROM 's3://sqream-demo-data/nba.csv' WITH OFFSET 2 RECORD DELIMITER '\r\n';
Loading Files from an Authenticated S3 Bucket
COPY nba FROM 's3://secret-bucket/*.csv' WITH OFFSET 2 RECORD DELIMITER '\r\n'
AWS_ID '12345678'
AWS_SECRET 'super_secretive_secret';