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A user complains about poor database performance. You want to verify if the user’s session has waited for certain types of I/O activity. Which view displays all waits waited on by a session at least once? (Choose one.)

Examine this configuration: 1. CDB1 is a container database running in ARCHIVELOG mode. 2. Controlfiles of CDB1 are multiplexed in '/u01/app/oracle/oradata/CDB1/controlfile/controlfile01.ctl' and '/u02/app/oracle/fast_recover_area/cdb1/CDB1/controlfile02.ctl'. 3. The only backup of CDB1 was taken when CONTROLFILE AUTOBACK was OFF 4. SNAPSHOT CONTROLFILE NAME is '/u01/app/oracle/product/12.2.0.1/db_1/dbs/snapcf_cdb1.f'. While CDB1 is open, '/u02/app/oracle/fast_recover_area/cdb1/CDB1/controlfile02.ctl' is accidentally deleted. To recover from this critical failure, you execute these commands: $ rman target sys/oracle_4U8localhost:1521/cdb1 RMAN> SHUTDOWN ABORT -- Oracle instance shut down RMAN> STARTUP NOMOUNT RMAN> RESTORE CONTROLFILE FROM '/u01/app/oracle/oradata/CDB1/controlfile/controlfile01.ctl'; What will be the outcome? (Choose one.)

Examine these actions: 1). Create a new database for a recovery catalog. 2). Create a tablespace with sufficient space in the catalog database for the recovery catalog. 3). Configure ARCHIVELOG mode for the catalog database. 4). Create a user to own the recovery catalog schema with quota on the tablespace that will contain the catalog. 5). Grant the RECOVERY_CATALOG_OWNER role to the recovery catalog schema owner. 6). Grant the SYSBACKUP privilege to the recovery catalog schema owner. Which are the minimum actions that must be performed before executing the CREATE CATALOG command?

Examine this configuration: 1). The ORCL database data files are in Automatic Storage Management (Oracle ASM) disk group +DATA. 2). ORCL uses disk group +FRA for the Fast Recovery Area. 3). LISTENER is the listener for ORCL. 4). The database, listener, ASM instance, and ASM disk groups are managed by Oracle Restart. 5). All components are currently shut down. You execute this command: $ srvctl start database - d ORCL What is the outcome? (Choose one.)

Examine these queries and their output:

SQL> select pdb_name, name, pdb_restore_point, clean_pdb_restore_point

2 from v$restore_point natural join dba_pdbs;

PDB_NAME NAME PDB_RESTORE_POINT CLEAN_PDB_RESTORE_POINT

-------- ------ ----------------- -----------------------

PDB1 R1 YES NO

SQL> select property_name, property_value

2 from database_properties where property_name like '%UNDO%';

PROPERTY_NAME PROPERTY_VALUE

---------------- ---------------

LOCAL_UNDO_ENABLED FALSE

An online RMAN backup of the CDB was taken an hour before Restore Point R1 was created.

You want to recover PDB1 to Restore Point R1.

How do you achieve this?

Which should be tuned first when doing a performance tuning exercise for an Oracle Database environment?

Your CDB has two regular PDBs as well as one application container with two application PDBs and an application seed. No changes have been made to the standard PDB$SEED. How many default temporary tablespaces can be assigned in the CDB?

Application PDBs, SALES_APP1 and SALES_APP2, must be created and they must access common tables of the SALES_APP application. Examine these steps: 1. Install the SALES_APP application, including the common tables, in the application root. 2. Install the SALES_APP application in the application root and the common tables in both the CDB root and the application root. 3. Create an application seed. 4. Install the SALES_APP application in the application seed. 5. Create the SALES_APP1 and SALES_APP2 application PDBs. 6. Sync the SALES_APP1 and SALES_APP2 application PDBs with the application root. 7. Sync the SALES_APP1 and SALES_APP2 application PDBs with the application seed. 8. Sync the application seed with the application root. Which are the minimum required steps in the correct sequence?

Which operating system group is NOT needed to perform an Oracle Database installation?

Examine this configuration: 1. CDB1 is an Oracle Database 12c Release 2 container database (CDB). 2. PDB1 and PDB2 are two pluggable databases (PDBs) in CDB1. After successfully performing all the preupgrade tasks, you execute these commands from the Oracle Database 18c environment: $$ export ORACLE_SID=cdb1 $$ sqlplus / as sysdba SQL> STARTUP UPGRADE; SQL> SHOW pdbs CON_ID CON_NAME OPEN MODE RESTRICTED ------- ---------- ---------- ---------- 2 PDB$$SEED MIGRATE YES 3 PDB1 MOUNTED YES 4 PDB2 MOUNTED YES SQL> ALTER PLUGGABLE DATABASE pdb1 OPEN UPGRADE; Pluggable database altered. SQL> exit $$ $ORACLE_HOME/perl/bin/perl catctl.pl -C 'PDB2' What is the outcome?

Examine this configuration: 1. CDB1 is a container database. 2. APP_ROOT is an application root in CDB1. 3. APP_PDB1 is an application PDB in APP_ROOT. 4. FLASHBACK DATABASE is ON. You execute these commands: $$ sqlplus sys/oracle_40@localhost:1521/cdb1 SQL> SELECT current_scn FROM v$$database; CURRENT_SCN ----------- 2074756 SQL> CREATE TABLE cdb1_tab(c1 NUMBER); Table created. SQL> ALTER SESSION SET CONTAINER = app_root; Session altered. SQL> CREATE TABLE app_root_tab(c1 NUMBER); Table created. SQL> ALTER SESSION SET CONTAINER = app_pdb1; Session altered. SQL> CREATE TABLE app_pdb1_tab(c1 NUMBER); Table created. SQL> conn / as sysdba Connected. SQL> ALTER PLUGGABLE DATABASE app_root CLOSE; Pluggable database altered. SQL> FLASHBACK PLUGGABLE DATABASE app_root TO SCN 2074756; Flashback complete. Which table or set of tables will exist after the Flashback operation has completed?

How do you configure a CDB for local undo mode?

Examine this configuration: 1. CDB1 is a container database. 2. COMMON_USER_PREFIX is set to an empty string. 3. PDB1 is a pluggable database in CDB1. 4. APP1_ROOT is an application container in CDB1. 5. APP1_PDB1 is an application PDB in APP1_ROOT. You execute these commands: $ sqlplus sys/oracle@localhost:1521/cdb1 as sysdba SQL> CREATE ROLE role1 CONTAINER=CURRENT; What is true? (缺图)

Which statement correctly describes the SQL profiling performed by the SQL Tuning Advisor?

Examine this configuration: 1. CDB1 is a container database running in ARCHIVELOG mode. 2. Multiple uncommitted transactions are running in CDB1. 3. Redo log groups 1 and 2 are INACTIVE. 4. Redo log group 3 is the CURRENT group. All members of redo log group 3 are lost before it is archived. Examine these possible steps: 1. SHUTDOWN ABORT 2. STARTUP NOMOUNT 3. STARTUP MOUNT 4. ALTER DATABASE MOUNT 5. RESTORE DATABASE 6. RECOVER DATABASE NOREDO 7. RECOVER DATABASE UNTIL AVAILABLE 8. RESTORE ARCHIVELOG ALL 9. ALTER DATABASE OPEN 10. ALTER DATABASE OPEN RESETLOGS Choose the minimum required steps in the correct order to recover the database.

A schema owner truncated a table in error and must recover the data. Which Oracle Flashback feature could be used to recover the data?

You execute this command successfully: SQL> ALTER DATABASE BACKUP CONTROLFILE TO TRACE; What is the outcome?

Examine this configuration: 1. CDB1 is a container database. 2. DEFAULT_SHARING is METADATA. 3. APP_ROOT is an application root contained in CDB1. 4. APP_PDB1 is an application PDB contained in APP_ROOT. 5. COMPANYAPP is an application contained in APP_ROOT. 6. EMP is a common table created in APP_ROOT and all its application PDBs, created when version 1.0 of COMPANYAPP was installed. You execute these commands: $ sqlplus sys/oracle@localhost:1521/cdb1 as sysdba SQL> ALTER SYSTEM SET DEFAULT_SHARING=DATA; System altered. SQL> ALTER SESSION SET CONTAINER=app_root; Session altered. SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp BEGIN UPGRADE '1.0' TO '2.0'; Pluggable database altered. SQL> ALTER TABLE emp ADD (sal NUMBER NOT NULL); Table altered. SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp END UPGRADE TO '2.0'; Pluggable database altered. SQL> ALTER SESSION SET CONTAINER=app_pdb1; Session altered. SQL> DESC emp; Name Null? Type ---- ------ ---- ENO NUMBER ENAME VARCHAR2(20) SQL> SELECT * FROM emp; ENO ENAME 100 Alan 200 Ben SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp SYNC; What will be the outcome and why?

Examine this configuration: 1. CDB1 is a container database. 2. There are several pluggable databases (PDBs) in CDB1. 3. Each PDB has several tables with referential integrity constraints. 4. FLASHBACK DATABASE is ON. 5. UNDO RETENTION GUARANTEE is enabled. Multiple undesired multitable changes were made in all the PDBs. Which method can be used to undo the changes using a single command?

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