Difference between SQL and PL/SQL

Hello

Wrong if I say:
SQL only access the database (under the hood)
PL/SQL is a layer on top of SQL.

Correct me if I'm wrong

Thank you

user12045475 wrote:

Try to understand, it is true what I write below?

What exactly is BC ? Cache buffers?

SQL:
Select *...
data-online BC-online client memory file

All SQL are analyzed as a SQL cursors. A handful of customer for this SQL cursor is returned to the caller. In the APIs such as ODBC, it is a statement handle. In PL/SQL, this is called a variable from PL/SQL cursor for example.

The client now called the interface extraction (using this handle) for this SQL cursor. The data moves from the (buffer cache/LMS) database to the client variables that will receive this output cursor.

If the client is remote, the data moves over TCP. If the client is local, that data travels via IPC (since the process of the Oracle server to the client process).

If this customer is the PL/SQL, the data moves from area (SGA) memory to another (PGA) within the same server process. This is the fundamental reason why PL/SQL will always be better than other clients as the travel itinerary data from the SQL cursor for the client variables/extraction buffer is very short.

Insert * select
data-online BC-online data file file

Same process as above. Only, the customer data from the database. It retrieves data from a table and inserts the data into another table - in the same cursor. The SELECTION of this slider component sends not all selected customer lines.

This highlights a fundamental approach to Oracle called SQL maximize and minimize the PL/SQLdevelopment.

The SELECT could be done via a dedicated slider. With the client by pulling all lines so that the database in the memory of the client. So, the INSERT could be done (also a dedicated slider) and the same data that is pushed back to the database.

So for this approach, data will be make to the customer, then from the client to the database database. It's quite a detour for travel. The same same thing could be done using a simple SQL cursor (as opposed to two dedicated sliders). And this slider could make reading and writing lines, without sending the data via a detour through the memory of the client.

The underlying concept is to optimize the use of SQL - solve both the problem of data processing in SQL itself. And if it is not really feasible using only SQL, then consider using the PL/SQL.

PL/SQL:
Select * in...
data file => BC-online PGA? -online client memory

See the answer in the upper part of the 1st sample you posted. This is no different. A SQL cursor is created (called a PL/SQL implicit cursor). The output of this slider is extracted and stored in local client variables (which reside in the PGA for PL/SQL code).

Tags: Database

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