Q. If a column contains 7 values and 6 distinct values, the cardinality is __________

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Q. For a table having 4 columns, the number of columns to which hash function is applied when using hash indexes is __________

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Q. The slow query log can be used to identify queries that may be performing badly.

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Q. The slow query log is written as __________

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Q. To check how MySQL would execute a SELECT query, which statement is used?

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Q. To perform analysis of key values by the server, the statement used is __________

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Q. Which statement is used to verify optimizer operation?

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Q. Which statement is used to force the optimizer to use tables in a particular order?

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Q. Which of these comparisons is slowest?

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Q. Which system variable tells the optimizer to skip certain plans based on estimates of the number of rows accessed for each table?

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Q. Which system variable tells how far into the rest of each incomplete plan the optimizer should look to evaluate whether it should be expanded further?

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Q. The optimizer_prune_level is set by default.

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Q. Calculations involving numbers are faster than those involving string.

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Q. To convert an int to string, the function is _________________

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Q. To convert a string to an int, the function is _________________

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Q. To maintain performance of tables having variable length rows, which statement is used?

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Q. Which of these columns are faster?

Variable length, Fixed length

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Q. Which of these take more space?

Variable length columns, Fixed length columns

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Q. To minimize disk I/O, which of these should be chosen?

CHAR, VARCHAR

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Q. Avoiding NULL in columns may make queries simpler.

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