What is TKProf in Oracle?

What is TKProf in Oracle?

TKProf is an Oracle database utility used to format SQL Trace output into human readable format. The TKProf executable is located in the ORACLE HOME/bin directory.

What are the types of indexes in Oracle?

Common Usage Indexes

• b-tree index. The most common index type is the b-tree index.
• function-based index.
• reverse key indexes.
• bitmap indexes.
• bitmap join indexes.
• compressed indexes.
• descending.
• partitioned indexes.

What is TKProf and how is it used?

TKPROF accepts as input a trace file produced by the SQL Trace facility, and it produces a formatted output file. TKPROF can also be used to generate execution plans. Run TKPROF on each individual trace file, producing a number of formatted output files, one for each session.

What is a hint in Oracle?

An Oracle hint provides directive to the optimizer in choosing an execution plan for the SQL statement being executed. The Oracle INDEX hint instructs the optimizer to use an index scan for the specified table. Use the INDEX hint for function-based, domain, B-tree, bitmap, and bitmap join indexes.

How is AutoTrace different from EXPLAIN PLAN in Oracle?

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.

When to use AutoTrace in a parallel query?

When you trace a statement in a parallel or distributed query, the execution plan shows the cost based optimizer estimates of the number of rows (the cardinality). In general]

How does AutoTrace work in utlxplan.sql script?

AUTOTRACE provides many of the TRACE and TKPROF statistics such as disk reads (physical reads) and total reads (consistent reads + db block gets). If the error “Unable to verify plan table format or existence” occurs when enabling AUTOTRACE, you must create a plan table using the utlxplan.sql script.

How to set AutoTrace on statistics in SQL?

Autotrace Setting Result SET AUTOTRACE OFF No AUTOTRACEreport is generated. This is SET AUTOTRACE ON EXPLAIN The AUTOTRACEreport shows only the optim SET AUTOTRACE ON STATISTICS The AUTOTRACEreport shows only the SQL s SET AUTOTRACE ON The AUTOTRACEreport includes both the op