What is difference between SQL profile and baseline?

When used together with its regular inputs, a SQL profile helps the optimizer minimize mistakes and thus more likely to select the best plan. A SQL plan baseline for a SQL statement consists of a set of accepted plans. When the statement is parsed, the optimizer will only select the best plan from among this set.

What is the difference between SQL Profiles and SQL plan baselines?

Think of it this way: SQL profiles give information to the optimizer to help select the best plan but don’t force the optimizer to select any specific plan. SQL plan baselines limit the optimizer plan selection to a set of accepted plans.

What is the difference between SQL profile and SPM baseline?

It is preferable to choose a SQL Profile simply because it allows the optimizer to pick best execution plans at run time. SQL Baseline on the other hand is more of a brute force method, when you simply marry a particular SQL to stay with a specific SQL execution plan.

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What is SQL profile?

A SQL profile is a set of auxiliary information specific to a SQL statement. Conceptually, a SQL profile is to a SQL statement what statistics are to a table or index. The database can use the auxiliary information to improve execution plans. … Therefore, SQL profiles just guide the optimizer to a better plan.

What is SQL baseline?

SQL plan management uses a mechanism called a SQL plan baseline. A plan baseline is a set of accepted plans that the optimizer is allowed to use for a SQL statement. In the typical use case, the database accepts a plan into the plan baseline only after verifying that the plan performs well.

What is SQL profile and SQL baseline in Oracle?

When used together with its regular inputs, a SQL profile helps the optimizer minimize mistakes and thus more likely to select the best plan. A SQL plan baseline for a SQL statement consists of a set of accepted plans. When the statement is parsed, the optimizer will only select the best plan from among this set.

How do I find SQL plan baselines?

Identify the SQL_ID of the SQL statement by querying the V$SQL view. Use this SQL_ID to manually load the SQL plan baseline. The DBA_SQL_PLAN_BASELINES view provides information about the SQL plan baselines. We can see there is a single plan associated with our baseline, which is both enabled and accepted.

How can I tell if a SQL profile is used?

SQL Profile is used by Optimizer for use more efficient execution plan for the SQL Query to make in accepted State. It is found in DBA_SQL_PROFILES view. It used to choose better plan by optimizer if the SQL profile plan is having low cost then optimizer use it. Check the SQL Profile in the Database.

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How do I create a SQL profile?

How to Create Custom SQL Profile

  1. Step 1: Review the mail.html.
  2. Step 2: Run COE_XFR_SQL_PROFILE.
  3. Step 3: Create Custome SQL Profile.
  4. Step 4: Verif is it using SQL_PROFILE.
  5. Step 5: Flushing a Single SQL Statement from Library Cache (Only if required)

How do I check if a SQL baseline is used?

Displaying SQL Baseline Plans

  1. run a statement that uses an index and check the plan.
  2. create a Baseline on the statement using the index (using my create_baseline. …
  3. check the hints stored with the baseline (using my baselines_hints. …
  4. run the statement again and check the real plan to see that the Baseline was used.

What is profile in database?

A database profile is a named set of parameters stored in your system registry that defines a connection to a particular database in the InfoMaker development environment. You must create a database profile for each data connection.

What is Oracle database profile?

Introduction to Oracle CREATE PROFILE statement. A user profile is a set of limits on the database resources and the user password. Once you assign a profile to a user, then that user cannot exceed the database resource and password limits. … First, specify the name of the profile that you want to create.

What is profiling in Oracle database?

The profiling utility allows Oracle to collect data in memory structures and then dumps it into tables as application code is executed. dbms_profiler is to PL/SQL, what tkprof and Explain Plan are to SQL. Once you have run the profiler, Oracle will place the results inside the dbms_profiler tables.

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How do I create a baseline in SQL?

You can create a SQL plan baseline in several ways: using a SQL Tuning Set (STS); from the cursor cache; exporting from one database and importing into another; and automatically for every statement.

How do I load a SQL baseline from AWR?

How to load sql plan baseline from AWR

  1. SELECT SS.SNAP_ID, SS.INSTANCE_NUMBER, BEGIN_INTERVAL_TIME, …
  2. BEGIN. DBMS_SQLTUNE. DROP_SQLSET (sqlset_name => ‘STS_f9948h4y2aa22’); …
  3. BEGIN. DBMS_SQLTUNE.CREATE_SQLSET( sqlset_name => ‘STS_f9948h4y2aa22’, …
  4. DECLARE. cur sys_refcursor; …
  5. SELECT. first_load_time , …
  6. DECLARE. my_plans pls_integer;