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1Z0-888 by Oracle - Page 1 | ExamCademy

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What does the possible_keys column in this output denote?

A if it is possible for you to include any indexes in your query
B whether there are any indexes on the tables that you are querying
C if there are any indexes that may be used to solve this query
D whether you are using any indexes in your query

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?

A The MySQL server has stopped inserting data to check index consistency.
B InnoDB is doing CRC32 checks over the tablespace data as it grows.
C The MySQL server is taking a periodical snapshot of data so it can resume the restore if it is interrupted mid-way.
D InnoDB has filled the redo log and now must flush the pages.
E Secondary indexes no longer fit into the buffer pool.

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