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Oracle MySQL 8.0 Database Developer Sample Questions (Q11-Q16):
NEW QUESTION # 11
Examine these my.cnf settings:
Examine this entry from /data/slow.log
Which option is also set in my.cnf?
- A. log__slow_admin_statements=1
- B. log_queries_not_using_indexes
- C. log_throttle_queries_not_using_indexes=100
- D. log_queries_not_using_indexes=ON
Answer: A
NEW QUESTION # 12
Examine these MySQL Shell statements:
What is the true about the attempts to add document to the collection?
- A. First three documents are added, then different number of fields cause an error.
- B. First two documents are added, then mismatched field names cause an error.
- C. All documents are added and cause a warning.
- D. All documents are added without any error or warning.
- E. First two documents are added, then mismatched field names cause a warning.
Answer: C
NEW QUESTION # 13
Which two are true about indexes?
- A. Indexes are used to enforce unique constraints.
- B. Indexing all of a table's columns improves performance.
- C. Secondary index access will always be faster than a table scan.
- D. Indexes contain rows sorted by key values.
- E. Indexes reduce disk space used.
Answer: B,E
NEW QUESTION # 14
Examine this statement and output:
CREATE TABLE geom (g GEOMETRY NOT NOLL, SPATIAL INDEX(g) ) ; Query OK, 0 rows affected, 1 warning (0.01 sec) An attempt is made to add an SRID attribute to the column using the statement:
ALTER TABLE geom MODIFY COLUMN g geometry NOT NULL SRID 0;
Which is true?
- A. An error is generated because srid o is an invalid identifier value.
- B. Execution succeeds with a warning.
- C. An error is generated because the index prevents changes to the column.
- D. Execution succeeds and allows the use of the index by the optimizer.
Answer: C
NEW QUESTION # 15
Examine this table definition:
The table must always remain a valid document store collection. What restriction does this impose on any added column?
- A. The column must be used in a unique constraint.
- B. The column must be a generated column referencing any attribute of doc.
- C. The column must be indexed.
- D. The column must be a generated column referencing only an existing attribute of doc.
- E. The column must have a default value.
Answer: B
NEW QUESTION # 16
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