What does explain plan and autotrace do in query Optimizer?

The main difference between the AUTOTRACE and EXPLAIN PLAN commands in Oracle is that AUTOTRACE actually executes the query (in the way TRACE does) and automatically queries the plan table, whereas EXPLAIN PLAN does neither. The AUTOTRACE command generates similar information, as shown in the next listing.

What is Tkprof and how is it used?

TKPROF determines execution plans by issuing the EXPLAIN PLAN statement after connecting to Oracle with the user and password specified in this parameter. The specified user must have CREATE SESSION system privileges. TKPROF takes longer to process a large trace file if the EXPLAIN option is used.

What is the use of autotrace in Oracle?

The autotrace utility is a very underutilized feature of SQL*Plus. It offers statement tracing and instant feedback on any successful SELECT, INSERT, UPDATE or DELETE statement. The autotrace provides instantaneous feedback including the returned rows, execution plan, and statistics.

What does Tkprof stand for?

the Transient Kernel PROFile
Answer: TKPROF stands for the Transient Kernel PROFile, set via the sql_trace parameter, and used to format a trace file into readable form.

What is Explain plan in Oracle?

The EXPLAIN PLAN statement displays execution plans chosen by the Oracle optimizer for SELECT , UPDATE , INSERT , and DELETE statements. A statement’s execution plan is the sequence of operations Oracle performs to run the statement. The row source tree is the core of the execution plan.

What is SQL trace in Oracle?

The SQL trace facility and TKPROF are two basic performance diagnostic tools which can help you monitor and tune applications that run against the Oracle Server.

What are Oracle trace files?

Oracle Database for Windows background threads use trace files to record occurrences and exceptions of database operations, and errors.

What is SQL trace?

SQL Trace is SQL Server’s built-in utility that monitors and records SQL Server 6.5 database activity. This utility can display server activity; create filters that focus on the actions of particular users, applications, or workstations; and filter at the SQL command level.

What are Explain plans?

What is trace file?

A trace file is a file containing a trace of certain events that happen (or will happen) during some process. In the context of dinero simulations, the trace file contains a trace of all the addresses used in memory references by the program from which the trace is generated.