You find this query being used in your Oracle 12c database:
Which method a used by the optimizer to limit the rows being returned?（）
You find this query being used in your Oracle 12c database:
Which method a used by the optimizer to limit the rows being returned?（）
You have an SQL query that takes one minute to execute. You use the following code segment to execute the
SQL query asynchronously.
Dim ar As IAsyncResult = cmd.BeginExecuteReader()
You need to execute a method named DoWork() that takes one second to run while the SQL query is executing.
DoWork() must run as many times as possible while the SQL query is executing.
Which code segment should you use?（）
You define the following regular expression of currency values:
regex tx = new regex("^-?\d+(\.\d{2})?$")
You are required to write code that will be used to find whether a string in the variable named Bill matches the regular expression or not. You are also required to use this code as the expression in a conditional statement and need to know which code segment to use.
What should you do?（）
Similar to viruses, you can also find malicious code in .
A utility program that makes copies of files to be used in case the originals are lost or damaged.
The（）technique involves using project characteristics in a mathematical model to predict total project cost. Models can be simple or complex.
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?（）
An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command:
SQL>CREATE INDEX ord_custname_ix ON orders(custname);
The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause.
You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.Which is the most efficient method of performing this task?（）
Click the Exhibit button and examine the data in the EMPLOYEES and DEPARTMENTS tables.
You want to retrieve all employees, whether or not they have matching departments in the departments table. Which query would you use?（）
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