2 EA - 20-40_V2

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?. V$SESSION_EVENT. V$SESSTAT. V$SESSION_WAIT. V$SESSION_WAIT_CLASS. V$SESSION.

Which two are true about gathering optimizer statistics? (Choose two.). Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics in all open PDBs except PDB$SEED. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to a PDB opened in read/write mode gathers object statistics for that PDB. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics only in CDB$ROOT. System statistics can be gathered only while connected to CDB$ROOT. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics in all open pluggable databases (PDBs).

Examine this output: Which two are true? (Choose two.). Any PDB not specified in the plan will be unable to execute statements in parallel. PDB3 can use all available parallel execution processes at times. PDB1 is always limited to 40% of the available system resources regardless of demand. Any PDB not specified in the plan will be able to use a maximum of 16.5% of the available system resources. PDB3 is guaranteed to receive at least 20% of the available system resources if there is enough demand. PDB2 is guaranteed at least 25% of the available parallel execution processes if there is enough demand.

Which two are true about the execution of operating system scripts starting from Oracle Database 19c? (Choose two.). orainstRoot.sh can be executed automatically by the Database installer by using sudo or root credentials. root.sh can be executed automatically by the Database Installer only if it is provided with root credentials. The sudo password can be specified in a response file. root.sh can be executed automatically by the Database installer only by using sudo credentials. The sudo password must be specified in a response file. The root password cannot be specified in a response file.

Automatic Shared Memory Management is disabled for one of your database instances. Some SQL statements perform poorly due to excessive hard parse activity, thereby degrading performance. What would be your next step?. Run the SQL Access Advisor. Run the Memory Advisor for the shared pool. Run the SQL Tuning Advisor. Run the Memory Advisor for the Program Global Area. Run the Memory Advisor for the System Global Area.

Which two are true about flashback features in Oracle Database 19c and later releases? (Choose two.). Flashback logs are automatically purged when DB_FLASHBACK_RETENTION_TARGET is set lower than the time they have already been retained. Flashback logs are monitored and proactively deleted when beyond the retention period defined in DB_FLASHBACK_RETENTION_TARGET only after there is space pressure. Flashback logs are monitored and proactively deleted when beyond the retention period defined in DB_FLASHBACK_RETENTION_TARGET before there is space pressure. Flashback logs are monitored for being older than the retention period defined in DB_FLASHBACK_RETENTION_TARGET and can be deleted by an administrator written script. Flashback logs are automatically purged whenever the value of DB_FLASHBACK_RETENTION_TARGET is changed.

Examine these queries and their output: Data file 24 can be recovered while PDB2 is opened. Data file 24 must be recovered while the CDB is opened. Data file 24 can be recovered while CDB$ROOT and PDB$SEED are opened. Data file 24 cannot be recovered while the CDB is opened. Data file 24 must be recovered while PDB2 is closed.

Which two are true about RMAN duplexed backup sets? (Choose two.). A duplexed backup set uses the same number of SBT channels as a non-duplexed backup set for the same number of files. A non-duplexed backup set written to disk can be duplexed to disk by backing up the backup set that is already on disk. A non-duplexed backup set written to SBT can be duplexed to tape by backing up the backup set that is already on tape. A non-duplexed backup set written to disk can be duplexed to tape by backing up the backup set that is already on disk. A non-duplexed backup set written to SBT can be duplexed to disk by backing up the backup set that is already on tape. A duplexed backup set always uses twice as many SBT channels as a non-duplexed backup set for the same number of files.

Which three are true about RMAN persistent configuration settings, administration, and their effects? (Choose three.). A target database's persistent RMAN configuration settings are always stored in the target's control file. Backup older than the recovery window retention policy are always deleted automatically if the backup location has insufficient space. Backups written to the fast recovery area (FRA) that are oboslete based on the redundancy retention policy can be deleted automatically to free space. The RMAN SHOW ALL command displays only settings with nondefault values. A target database's persistent RMAN configuration settings are always synchronized automatically with the RMAN catalog. V$RMAN_CONFIGURATION view displays only settings with values that have been modified. A DBA must specify either a redundancy retention policy or a recovery window retention policy.

Which three are true about Optimizer Statistics Advisor? (Choose three.). It can be run only manually. It is part of the DBMS_ADVISOR package. It can recommend changes to improve the statistics gathering process. It always analyzes all schemas in the database. It runs automatically every night by default. It is part of the DBMS_STATS package.

You issued this command: RMAN> BACKUP RECOVERY FILES; Which two are true? (Choose two.). All Oracle recovery files not in the current FRA that have not been backed up already, are backed up. All non-Oracle files in the current FRA that have not been backed up already, are backed up. All Oracle recovery files in the current FRA that have not been backed up already, are backed up. All Oracle recovery files in the current fast recovery area (FRA) are backed up. These backups can be written to disk or SBT.

Which two are true about the Oracle database methodology? (Choose two.). The Oracle Database time model should be used to find the database and instance areas most in need of tuning. Tuning activities should stop once the user is satisfied with performance. Tuning activities should stop once agreed service levels for performance have been met. The database instance memory should always be tuned before tuning any file systems. SQL statements should always be tuned before tuning any file systems. The alert log should be used to find the database and instance areas most in need of tuning.

While backing up to the Oracle Fast Recovery Area (FRA), you determined the backup is taking too long and suspect a performance bottleneck. Which three are true about diagnosing and tuning these problems? (Choose three.). If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then both read and write I/O are likely bottlenecks. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using synchronous I/O. If an RMAN BACKUP VALIDATE command takes noticeably less than an actual backup, then write I/O is a likely bottleneck. If an RMAN BACKUP VALIDATE command takes roughly the same time as an actual backup, then read I/O is a likely bottleneck. Data files with a high value in V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECOND are a potential performance bottleneck when synchronous I/O is used. Setting DBWR_IO_SLAVES to a non zero value can improve backup performance when using asynchronous I/O. Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a potential performance bottleneck when asynchronous I/O is used.

You are managing this configuration: 1. CDB1 is a container database. 2. PDB1 and PDB2 are two pluggable databases in CDB1. 3. USER1.EMP is a table in PDB1 and USER2.DEPT is a table in PDB2. CDB1 user SYS executes these commands after connecting successfully to PDB2: The inserts on USER1.EMP remain uncommitted when the session connected to PDB2. The inserts on USER1.EMP were committed when the session inserted a row into USER2.DEPT. The insert on USER2.DEPT fails because of the active transaction in the parent container. The insert on USER2.DEPT is a recursive autonomous transaction by the child session and is committed. The inserts on USER1.EMP were rolled back when the session connected to PDB2. The insert on USER2.DEPT is uncommitted. The inserts on USER1.EMP were committed when the session connected to PDB2.

Examine this configuration: 1. CDB1 is an Oracle Database 12c Release 2 database containing pluggable databases PDB$SEED, PDB1, and PDB2. 2. PDB$SEED is open READ ONLY 3. PDB1 is open READ WRITE 4. PDB2 is MOUNTED. 5. ORACLE_HOME is /u01/app/oracle/product/18.1.0/dbhome_1. You execute these commands before upgrading the database to the current release. CDB1, PDB$SEED, PDB1, and PDB2. PDB$SEED, PDB1, and PDB2 only. CDB1 and PDB$SEED only. CDB1, PDB1, and PDB2 only. CDB1, PDB$SEED, and PDB1 only.

Which two are true about Oracle Flashback features? (Choose two.). FLASHBACK QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files. FLASHBACK VERSION QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files. FLASHBACK TABLE can undrop a column. FLASHBACK DROP can undrop an index when undropping a table. After a database is restored from flashback logs using the FLASHBACK DATABASE command, it is sometimes rolled forward using redo logs.

Which three are true about an application seed pluggable database (PDB)? (Choose three.). It is automatically synchronized with its application root PDB when an application is upgraded. It cannot be added to an application container after the application container has already been created. A new application PDB created by cloning an application seed PDB can have an old version of the application installed after cloning completes. It is automatically synchronized with its application root PDB when an application is installed. It cannot be dropped from its application container. A new application PDB created by cloning an application seed PDB can have an up-to-date version of the application installed after cloning completes. It is not required in an application container.

Examine this configuration: 1. CDB1 is a container database. 2. PDB1 and PDB2 are pluggable databases in CDB1. 3. PDB1 and PDB2 are OPEN in READ WRITE mode. You execute these commands successfully: Uncommitted transactions in PDB1 have been rolled back. PDB1 is closed. Uncommitted transactions in CDB1 and PDB1 have been rolled back. CDB1 is shut down. CDB1 is in MOUNT state.

Which three are true about Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and the Manageability Monitor (MMON) background process? (Choose three.). ADDM can recommend shrinking the buffer cache. ADDM can recommend extending the buffer cache. By default, MMON creates an AWR snapshot every 30 minutes. ADDM performs its analysis only when a DBA requests it. By default, AWR snapshots are automatically purged after eight days. AWR snapshots must be deleted when no longer required by ADDM.

Examine the command for creating pluggable database PDB2 in container database CDB2. Select three options, any one of which is required for it to execute successfully? (Choose three.). Add the FILE_NAME_CONVERT clause to the statement and set the PDB_FILE_NAME_CONVERT parameter. Add only the CREATE_FILE_DEST clause to the statement. Set only the PDB_FILE_NAME_CONVERT parameter. Set the PDB_FILE_NAME_CONVERT parameter and enable OMF. Enable only OMF. Add the FILE_NAME_CONVERT clause to the statement and enable Oracle Managed Files (OMF).