- Why do we need triggers?
- Why do we write stored procedures?
- How can stored procedure improve performance?
- Do stored procedures run faster?
- What are the disadvantages of stored procedures?
- Is stored procedure faster than query in MySQL?
- When should I use stored procedures and when should I use views in SQL Server?
- What is the advantage of using stored procedure?
- Why we use stored procedure instead of function?
- Should stored procedures be avoided?
- How are stored procedures called?
- What is difference between stored procedure and function?
- How do you perform a performance tuning in PL SQL?
- What is set Nocount on in stored procedure?
- Which is better inline query or stored procedure?
- Which is faster stored procedure or function?
- Why stored procedure is better than query?
- How do I optimize a SQL stored procedure?
- When should you use stored procedures?
- Can we call a stored procedure inside a function?
- Are stored procedures compiled?
Why do we need triggers?
Triggers help the database designer ensure certain actions, such as maintaining an audit file, are completed regardless of which program or user makes changes to the data.
The programs are called triggers since an event, such as adding a record to a table, fires their execution..
Why do we write stored procedures?
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.
How can stored procedure improve performance?
Specify column names instead of using * in SELECT statement. Try to avoid * … Avoid temp temporary table. Temporary tables usually increase a query’s complexity. … Create Proper Index. Proper indexing will improve the speed of the operations in the database.Use Join query instead of sub-query and co-related subquery.
Do stored procedures run faster?
“Stored procedures are precompiled and cached so the performance is much better.” Stored procedures are precompiled and optimised, which means that the query engine can execute them more rapidly. By contrast, queries in code must be parsed, compiled, and optimised at runtime. This all costs time.
What are the disadvantages of stored procedures?
-Disadvantages of the Stored procedure.A large number of Logical operations increase CPU usage.Difficult to Debug.Not easy to Develop and Maintain.Not designed for developing Complex or Flexible business logic.
Is stored procedure faster than query in MySQL?
Stored procedures have many other benefits than speed, security being high on the list. … In MySQL or any other SQL server as MSSQL or Oracle, stored procedures increase dramatically the speed of the queries involved because this are already compiled.
When should I use stored procedures and when should I use views in SQL Server?
Views should be used to store commonly-used JOIN queries and specific columns to build virtual tables of an exact set of data we want to see. Stored procedures hold the more complex logic, such as INSERT, DELETE, and UPDATE statements to automate large SQL workflows.
What is the advantage of using stored procedure?
A Stored Procedure can be used as a modular programming which means create once, store and call for several times whenever it is required. This supports faster execution. It also reduces network traffic and provides better security to the data.
Why we use stored procedure instead of function?
Procedure allows SELECT as well as DML(INSERT/UPDATE/DELETE) statement in it whereas Function allows only SELECT statement in it. … Stored Procedures cannot be used in the SQL statements anywhere in the WHERE/HAVING/SELECT section whereas Function can be. Functions that return tables can be treated as another rowset.
Should stored procedures be avoided?
Stored procedures are difficult to unit test. With an ORM, you can mock your database code so as to be able to test your business logic quickly. With stored procedures, you have to rebuild an entire test database from scratch. Stored procedures offer no performance advantage whatsoever.
How are stored procedures called?
A stored procedure is a group of one or more database statements stored in the database’s data dictionary and called from either a remote program, another stored procedure, or the command line. Stored procedure are commonly called SPROCS, or SP’s.
What is difference between stored procedure and function?
The function must return a value but in Stored Procedure it is optional. Even a procedure can return zero or n values. Functions can have only input parameters for it whereas Procedures can have input or output parameters. Functions can be called from Procedure whereas Procedures cannot be called from a Function.
How do you perform a performance tuning in PL SQL?
Avoiding CPU Overhead in PL/SQL CodeMake SQL Statements as Efficient as Possible. … Make Function Calls as Efficient as Possible. … Make Loops as Efficient as Possible. … Don’t Duplicate Built-in String Functions. … Reorder Conditional Tests to Put the Least Expensive First. … Minimize Datatype Conversions.More items…
What is set Nocount on in stored procedure?
SET NOCOUNT ON prevents the sending of DONE_IN_PROC messages to the client for each statement in a stored procedure.
Which is better inline query or stored procedure?
Since stored procedure is saved on a database level, sharing of application logic between applications is easier than using libraries or APIs. It is easier to troubleshoot a stored procedure than inline query as we can isolate it. … Performance tuning is possible to do on stored procedure level.
Which is faster stored procedure or function?
Stored Procedures can be fast, very fast, as they are pre-compiled. The optimiser does not have to work out the execution plan each time. A Stored Procedure will return results in a table form. Functions can be Scalar (returning a single result) or return Tabular data.
Why stored procedure is better than query?
The primary advantage to parameterized queries and stored procedures is that they don’t have to go through the compile process over and over again. Stored procedures also offer some additional security aspects. Ad hoc queries are just query strings passed to the server directly. They are compiled and stored in memory.
How do I optimize a SQL stored procedure?
SQL Server Stored Procedures Optimization TipsUse stored procedures instead of heavy-duty queries. … Include the SET NOCOUNT ON statement in your stored procedures to stop the message indicating the number of rows affected by a Transact-SQL statement. … Call stored procedures using their fully qualified name.More items…•
When should you use stored procedures?
Basically when you have to perform operations involving data that do not need to get out of the database. For example, you want to update one table with data from another, it makes little sense to get the data out and then back in if you can do it all in one single shot to the db.
Can we call a stored procedure inside a function?
7 Answers. You cannot execute a stored procedure inside a function, because a function is not allowed to modify database state, and stored procedures are allowed to modify database state. … Therefore, it is not allowed to execute a stored procedure from within a function.
Are stored procedures compiled?
4 Answers. In Microsoft SQL Server, stored procedures are compiled into a query plan the first time they are run. At subsequent runs, they are sometimes recompiled from source, but not always. That is why they are called “pre-compiled”.