A company uses Amazon Redshift and finds that some columns have suboptimal compression encodings. The data engineer must improve the encoding choices for those tables. What is the appropriate action?
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Correct answer: Run the ANALYZE COMPRESSION command against the identified tables. Manually update the compression encoding of columns based on the output of the command..
Why this is the answer
The ANALYZE COMPRESSION command in Amazon Redshift analyzes a table's data and recommends optimal compression encodings for its columns. This command provides insights into how different compression types would perform, allowing a data engineer to make informed decisions to improve storage efficiency and query performance. After running this command, the engineer would then manually alter the table to apply the recommended encodings. Running ANALYZE alone updates statistics for the query optimizer but does not recommend compression encodings. VACUUM REINDEX and VACUUM RECLUSTER are used for reclaiming space and re-sorting data based on sort keys, respectively, and do not address compression encoding optimization.
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