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Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

AUTOTRACE

AUTOTRACE, introduced in Oracle8i, enables automatic reporting on statements issued in SQL*Plus. To use AUTOTRACE, a PLAN_TABLE must exist (for the storage of EXPLAIN PLAN information) and the user must have been granted the PLUSTRACE role. The PLUSTRACE role is created by running the PLUSTRACE.SQL script as DBA; it may then be granted to other users.

You can control AUTOTRACE operations by issuing the following statement:

SET AUTOTRACE ON | OFF | TRACEONLY option

where option can be EXPLAIN or STATISTICS. Without an option, AUTOTRACE returns information on the optimization (EXPLAIN) and the statistics used by the statement. If you specify TRACEONLY, the statement returns the optimizer plan and the statistics but does not return any result.

The statistics that are created by AUTOTRACE are:

Recursive calls
DB block - gets number of times a CURRENT block was requested
Consistent - gets number of times a consistent read was requested for a block
Physical reads - number of datablocks read from disk
Redo size - amount of redo generated, listed in bytes
Bytes sent via Oracle Net Services to client
Bytes sent via Oracle Net Services from client
SQL*Net round-trips to and from clients
Sorts in memory
Sorts in disk
Rows processed
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Publisher Resources

ISBN: 0596003366Errata Page