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1z1-084證照 - 1z1-084權威考題
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最新的 Oracle Database 19c 1z1-084 免費考試真題 (Q55-Q60):
問題 #55
Examine this statement and output:
Which two situations can trigger this error?
- A. The user lacks the required privileges to execute the DBMS WORKLOAD CAPTURE package or the directory.
- B. The instance is unable to access the capture directory.
- C. The syntax is incomplete.
- D. The capture directory is part of the root file system.
- E. There is a file in the capture directory.
答案：A,B
解題說明：
The ORA-15505 error indicates that the instance encountered errors while trying to access the specified directory. This could be due to:
A: Insufficient privileges: The user attempting to start the workload capture might not have the required permissions to execute the DBMS_WORKLOAD_CAPTURE package or to read/write to the directory specified.
E: Accessibility: The database instance may not be able to access the directory due to issues such as incorrect directory path, directory does not exist, permission issues at the OS level, or the directory being on a file system that's not accessible to the database instance.
References:
* Oracle Database Error Messages, 19c
* Oracle Database Administrator's Guide, 19c
問題 #56
Examine this statement and output:
Which three statements are true?
- A. Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.
- B. Session 8779 may be waiting due to a network problem.
- C. Session 9857 is not waiting.
- D. Both 9822 and 8779 sessions are waiting for operating system resources.
- E. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
- F. Session 8779 may be waiting for a user or application response.
答案：A,B,F
解題說明：
For this SQL statement and output, we can analyze the EVENT column to understand the type of wait:
B: The event "SQL*Net message from client" typically indicates that the session is waiting for a response from the client. This can be due to a network issue, user response, or an application processing delay.
E: The event "SQL*Net message from client" also implies that the session is idle waiting for the client (a user or an application) to send a request to the server. This event usually indicates that the session is not actively working but is instead waiting for the next command.
F: The wait event "enq: TX - row lock contention" suggests that session 9822 is waiting for a row-level lock held by another session. If the holding session issues a COMMIT or ROLLBACK, the lock will be released, and session 9822 will stop waiting. Since this session is experiencing row lock contention, it implies it's waiting for a specific transaction to complete.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation
問題 #57
Which two types of performance problems are reported by ADDM for PDBS?
- A. Excessive checkpoint writes
- B. User I/O waits
- C. I/O capacity limits
- D. SGA sizing issues
- E. Top SQL statements
答案：C,E
解題說明：
ADDM (Automatic Database Diagnostic Monitor) is a key Oracle diagnostic tool that analyzes performance data captured by AWR (Automatic Workload Repository) and provides insights into performance issues. In a PDB (Pluggable Database), ADDM can provide recommendations for various types of performance issues.
Why A. I/O capacity limits is correct:
* ADDM evaluates the performance of a database and identifies I/O bottlenecks that could be impacting query performance.
* I/O capacity limits occur when the database cannot handle the I/O workload effectively, which could be due to disk contention, inadequate I/O throughput, or hardware limitations.
* ADDM reports such issues and suggests remedies like tuning SQL queries, redistributing I/O workloads, or upgrading storage systems.
Why D. Top SQL statements is correct:
* One of the critical capabilities of ADDM is identifying high-resource-consuming SQL statements (Top SQL) that are impacting database performance.
* For PDBs, ADDM provides specific recommendations to optimize these SQL statements, such as improving execution plans, adding indexes, or rewriting queries.
Why Other Options Are Incorrect:
* B. Excessive checkpoint writes:
* While excessive checkpoint writes can occur, ADDM typically focuses on higher-level performance problems like I/O issues or top SQL rather than specific low-level operational events like checkpointing. Excessive checkpoint writes are not commonly reported directly for PDBs by ADDM.
* C. SGA sizing issues:
* ADDM does not directly analyze or provide recommendations for SGA (System Global Area) sizing issues at the PDB level because SGA is managed at the CDB (Container Database) level.
PDBs share the SGA of the CDB.
* E. User I/O waits:
* While user I/O waits are captured in performance metrics, ADDM typically groups them under broader issues like I/O capacity limits. It does not specifically report on "user I/O waits" as a standalone problem.
Key Features of ADDM for PDBs:
* Identifying Top SQL Statements impacting performance.
* Reporting I/O issues, including capacity limits and contention.
* Highlighting inter-PDB resource contention within the same CDB.
References to Oracle Documentation:
* Oracle Database 19c Performance Tuning Guide:
* Section: Using ADDM for Pluggable Databases.
* Details the types of performance issues ADDM reports for PDBs.
* Automatic Database Diagnostic Monitor (ADDM) Concepts:
* Highlights ADDM's ability to analyze I/O, SQL performance, and resource utilization.
問題 #58
Examine these commands, which execute successfully:
Which statement is true?
- A. ADDM, AWR, and ASH reports can be purged automatically.
- B. AD DM is enabled for all pluggable databases.
- C. AWR- snapshots in all pluggable databases will be purged automatically after every 60 mins.
- D. AWR snapshots can be purged manually in pluggable databases.
答案：D
解題說明：
The DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS procedure allows
setting attributes related to AWR snapshots. While the interval setting controls the frequency of snapshot generation, purging them is a separate process that can be managed either automatically (with retention settings) or manually.References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Multitenant Administrator's Guide, 19c
問題 #59
Which statement is true about DB time in V$$YS_TIME_MODEL?
- A. DB tine excludes the time spent waiting for a CPU in the operating system run queue.
- B. DB time can be many times greater than the elapsed time since the database instance started.
- C. DB time is organized as a simple list of statistics and any time period is attributable to only one statistic.
- D. DB time includes the time spent executing the RMAN backup and restore command.
答案：B
解題說明：
DB time includes the time spent on user and background processes. It can be greater than the elapsed time because it accumulates the active time of all the processes. For example, if two sessions are each active for 2 seconds at the same time, DB time would accumulate 4 seconds, while the elapsed time would be only 2 seconds.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c
問題 #60
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