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- grade (grade_id, grade_value, grade_date) ~100M rows
- grade_archive (grade_id, grade_value, grade_date) 0 rows
- peer_review (grade_id, peer_review_value, peer_review_date) ~10M rows
- grade ~10M rows
- grade_archive ~90M rows
- peer_review ~10M rows
- INSERT
- LOW_PRIORITY
- INTO grade_archive
- (grade_id,grade_value,grade_date)
- SELECT
- grade_id,grade_value,grade_date
- FROM
- grade
- WHERE
- grade_date < DATE_ADD(NOW(), INTERVAL -1 MONTH)
- AND grade_id NOT IN
- (
- SELECT grade_id FROM peer_review
- );
- DELETE LOW_PRIORITY FROM grade WHERE grade_id IN (SELECT grade_id FROM grade_archive);
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