Oracle | Autotrace

Oracle AUTOTRACE Version 21c

General Information

Library Note

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CDB Warning Thus script used to create the autotrace role can not be run in CDB$ROOT only within a PDB.

-- the fact that this role can not be created in CDB$ROOT is poor form by essentially any definition. I reported it during Beta 2 and it was not fixed.

Create PLUSTRACE Role [oracle@test21 dbhome_1]$ sqlplus sys@pdbdev as sysdba SQL*Plus: Release 21.0.0.0.0 - Production on Sat Jan 23 03:03:33 2021 Version 21.1.0.0.0 Copyright (c) 1982, 2020, Oracle. All rights reserved. Enter password: Connected to: Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production Version 21.1.0.0.0 SQL> @?/sqlplus/admin/plustrce.sql SQL> drop role plustrace; drop role plustrace * ERROR at line 1: ORA-01919: role 'PLUSTRACE' does not exist SQL> create role plustrace; Role created. SQL> grant select on v_$sesstat to plustrace; Grant succeeded. SQL> grant select on v_$statname to plustrace; Grant succeeded. SQL> grant select on v_$mystat to plustrace; Grant succeeded. SQL> grant plustrace to dba with admin option; Grant succeeded. SQL> SQL> set echo off

Grant PLUSTRACE Role GRANT plustrace TO <user_name>;

SQL> conn sys@pdbdev as sysdba -- connect as SYS to the pdbdev PDB

      

      SQL> GRANT plustrace TO uwclass;

Syntax and Demos

Syntax SET AUTOT[RACE] {OFF | ON | TRACE[ONLY]} [EXP[LAIN]] [STAT[ISTICS]]

Trace and Run SQL> conn uwclass@pdbdev Enter password: set autotrace on SELECT * FROM dual; D - X Execution Plan ---------------------------------------------------------- Plan hash value: 272002086 ------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 2 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS FULL| DUAL | 1 | 2 | 2 (0)| 00:00:01 | ------------------------------------------------------------------------- Statistics ---------------------------------------------------------- 5 recursive calls 6 db block gets 6 consistent gets 0 physical reads 1548 redo size 564 bytes sent via SQL*Net to client 52 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed

Trace Only set autotrace traceonly SELECT * FROM dual; Execution Plan ---------------------------------------------------------- Plan hash value: 272002086 ------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 2 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS FULL| DUAL | 1 | 2 | 2 (0)| 00:00:01 | ------------------------------------------------------------------------- Statistics ---------------------------------------------------------- 5 recursive calls 6 db block gets 6 consistent gets 0 physical reads 1548 redo size 564 bytes sent via SQL*Net to client 52 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed

Trace and Explain set autotrace traceonly explain SELECT * FROM dual; Execution Plan ---------------------------------------------------------- Plan hash value: 272002086 ------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 2 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS FULL| DUAL | 1 | 2 | 2 (0)| 00:00:01 | -------------------------------------------------------------------------

Trace and Statistics set autotrace traceonly statistics SELECT * FROM dual; Statistics ---------------------------------------------------------- 5 recursive calls 6 db block gets 6 consistent gets 0 physical reads 1548 redo size 564 bytes sent via SQL*Net to client 52 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed

Stop Tracing SET AUTOTRACE OFF

set autotrace off

      

      SELECT * FROM dual;

      

      D

      -

      X