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What does the possible_keys column in this output denote?
You have a consistent InnoDB backup created with mysqldump, the largest table is 50 GB in size.
You start to restore your backup with this command;
shell> mysql –u root –p < backup.sql
After 30 minutes, you notice that the rate of restore seems to have slowed down. No other processes or external factors are affecting server performance.
Which is the most likely explanation for this slowdown?