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1Z0-909 Certification Detail
Exam Code 1Z0-909 Full Exam Name Oracle MySQL 8.0 Database Developer
of Questions 65
Exams 1Z0-909 Online Practice Exam
Score 62%
Limit 90 minutes Recommended Training Earn the MySQL 8.0 Database Developer Certified Professional Credential
Passing
Time
Number
Practice
Syllabus Topics for Oracle
Topic Name
Connectors and APIs
MySQL Schema Objects and Data
Data-driven Applications
Transactions
Query Optimization
JSON and Document Store
MySQL Stored Programs
Exam
1Z0-909
Oracle 1Z0-909 Exam Questions ?
01. You are using buffered queries with PHP mysqli in a browser-based web application. Which three are true?
Option
a) Additional queries on the same session are blocked until the result set is released.
b) Results are sent to the calling PHP process for buffering.
c) Buffered queries must be explicitly enabled using mysqliuseresult.
d) Large results can have a negative impact on performance.
e) Results are sent from the server to the browser for buffering.
f) Buffered queries are enabled by default.
g) Buffered queries should be used on large tables when the result size is unknown.
ANSWER
c) Buffered queries must be explicitly enabled using mysqliuseresult.
d) Large results can have a negative impact on performance.
g) Buffered queries should be used on large tables when the result size is unknown.
02. You must enforce data integrity for data Inserted in a JSON column. Which statement successfully creates a constraint in a 3SON column?
Option
a) CREATE TABLE fshop (id INT NOT NULL AUTO_ INCREMENT, product JSON, CHECK (id>0) ) ENGXNE=InnoDB;
b) CREATE TABLE fshop ( product JSON, f INT' GENERATED ALWAYS AS (product->"S - id") ) ;
c) CREATE TABLE fshop (id INT NOT NULL AUTOINCREMENT, product JSON, PRIMARY KEY (id)) ENGINE=InnoDB;
d) CREATE TABLE fshop (product JSON CHECK (JSON_VALID(product) ) ) ;
ANSWER
c) CREATE TABLE fshop (id INT NOT NULL
AUTOINCREMENT, product JSON, PRIMARY KEY (id)) ENGINE=InnoDB;
03. Which two statements are true about aggregate functions?
Option
a) COUNT (distinct) returns a count of the number of rows with different values including Null.
b) MAX () returns null if there are no rows to aggregate.
c) AVG () does not allow use of the distinct option.
d) SUM () returns o if there are no rows to aggregate.
e) MIN () cannot use distinct when it executes as a Windows function.
ANSWER
c) AVG () does not allow use of the distinct option.
04. Which of the following statements is true about using a connector to retrieve data from a database?
Option
a) It is not possible to retrieve data from a database using a connector
b) It is only possible to retrieve data from a database using SQL queries
c) A connector simplifies the process of retrieving data from a database
d) Retrieving data from a database using a connector is slower than using SQL queries
ANSWER
c) A connector simplifies the process of retrieving data from a database
05. Which two are true about indexes?
Option
a) Secondary index access will always be faster than a table scan.
b) Indexes reduce disk space used.
c) Indexes are used to enforce unique constraints.
d) Indexing all of a table's columns improves performance.
e) Indexes contain rows sorted by key values.
ANSWER
b) Indexes reduce disk space used.
d) Indexing all of a table's columns improves performance.
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