A company is currently planning on using Redshift to host their data warehouse.
Different departments have submitted their files for uploading to various S3 buckets.
You need to ensure all the data files are uploaded efficiently to the cluster with the least maintenance overhead.
Which of the following method would you incorporate for this scenario?
Click on the arrows to vote for the correct answer
A. B. C. D.Answer - A.
This is given in the AWS Documentation.
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Using a Manifest to Specify Data Files.
You can use a manifest to ensure that the COPY command loads all of the required files, and only the required files, for a data load.
Instead of supplying an object path for the COPY command, you supply the name of a JSON-formatted text file that explicitly lists the files to be loaded.
The URL in the manifest must specify the bucket name and full object path for the file, not just a prefix.
You can use a manifest to load files from different buckets or files that do not share the same prefix.
The following example shows the JSON to load files from different buckets and with file names that begin with date stamps.
{
"entries": [
{"url":"s3://mybucket-alpha/2013-10-04-custdata", "mandatory":true},
{"url":"s3://mybucket-alpha/2013-10-05-custdata", "mandatory":true},
{"url":"s3://mybucket-beta/2013-10-04-custdata", "mandatory":true},
{"url":"s3://mybucket-beta/2013-10-05-custdata", "mandatory":true}
]
}
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Option B is incorrect since this is not a requirement and can also pose to be a security issue.
Option C is incorrect since this would be in inefficient process.
Option D is incorrect since this is not a requirement for the COPY process.
For more information on using manifest files, please refer to the below URL.
https://docs.aws.amazon.com/redshift/latest/dg/loading-data-files-using-manifest.htmlThe most efficient and low-maintenance method to upload data to a Redshift data warehouse from multiple S3 buckets is to use a manifest file for the COPY command. Therefore, the correct answer is A.
A manifest file is a simple text file that lists the data files to be copied to the Redshift cluster. It also includes additional information such as the file format, compression, and delimiter. By using a manifest file, Redshift only needs to scan the files listed in the manifest file, which reduces the time and resources required for data loading. Additionally, the manifest file allows you to upload files from multiple S3 buckets or folders without requiring you to consolidate the files into a single location.
On the other hand, making all the buckets public, copying all the files to a central S3 bucket, or enabling versioning for the bucket would not be the most efficient or low-maintenance method to upload data to Redshift.
Making all the buckets public would compromise the security of the data, and it is not necessary for Redshift to access the data in the buckets.
Copying all the files to a central S3 bucket would require additional steps to consolidate the data and create a manifest file, which would increase maintenance overhead.
Enabling versioning for the bucket is not related to data loading efficiency, and it is not necessary for Redshift to access the data in the buckets. It is a feature that helps you keep track of multiple versions of an object in S3.
Therefore, the best method to upload data to Redshift from multiple S3 buckets is to use a manifest file for the COPY command.