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QUESTION NO: 2 After analysis on the slow query log on a high-end OLTP service, the table identified in the slow queries is: What are the two most likely reasons for the slowness given this output? (Choose two.) A. The User field is too long for most names. B. Date should be a TIMESTAMP field for better performance. C. Using default values for DATETIME causes table scans. D. The engine type is not appropriate to the application use. E. No indexes are defined. Answer: D,E
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QUESTION NO: 5 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. InnoDB has filled the redo log and now must flush the pages. B. The MySQL server is taking a periodical snapshot of data so it can resume the restore if it is interrupted mid-way. C. InnoDB is doing CRC32 checks over the tablespace data as it grows. D. Secondary indexes no longer fit into the buffer pool. E. The MySQL server has stopped inserting data to check index consistency. Answer: E
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Updated: May 28, 2022
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