1Z0-909 무료 덤프문제 온라인 액세스

Which two are true about indexes?

• A.Indexes reduce disk space used.
• B.Secondary index access will always be faster than a table scan.
• C.Indexing all of a table's columns improves performance.
• D.Indexes are used to enforce unique constraints.
• E.Indexes contain rows sorted by key values.

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 have a default value.
• B.The column must be used in a unique constraint.
• 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 be a generated column referencing any attribute of doc.

What is an advantage of using mysqli in PHP programs rather than using PHP Data Objects (PDO)?

• A.mysqli includes X DevAPI functions.
• B.mysqli supports non blocking, asynchronous queries.
• C.mysqli supports object oriented programming.
• D.mysqli can access databases from other vendors.

You are using buffered queries with PHP mysqli in a browser-based web application. Which three are true?

• A.Additional queries on the same session are blocked until the result set is released.
• B.Buffered queries are enabled by default.
• C.Results are sent from the server to the browser for buffering.
• D.Large results can have a negative impact on performance.
• E.Buffered queries should be used on large tables when the result size is unknown.
• F.Buffered queries must be explicitly enabled using mysqliuseresult.
• G.Results are sent to the calling PHP process for buffering.

Examine this statement and output:

Now, examine these desired output values:

Which statement updates the table data as require

• A.UPDATE exam_result SET score=ROUND(score,1);
• B.UPDATE exam_result SET score=TRUNCATE(score,1);
• C.UPDATE exam_result SET score=TRUNCATE
• D.UPDATE exam_result SET score=CEIL(ROUND(score,1));
• E.UPDATE exam_result SET score=CEIL(TRUNCATE(sco
• F.UPDATE examresult SET score=ROUND(CEIL(score