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[Hardware] Practice 1Z0-182 Questions & 1Z0-182 Valid Real Exam

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【Hardware】 Practice 1Z0-182 Questions & 1Z0-182 Valid Real Exam

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Oracle Database 23ai Administration Associate Sample Questions (Q68-Q73):NEW QUESTION # 68
Which three statements are true about row chaining and row migration done by Oracle database block space management?
  • A. Insert statements can result in a migrated row.
  • B. Row pieces of a chained row must always reside in different blocks.
  • C. Update statements can result in one or more migrated rows.
  • D. A migrated row results in an update to any index on the table to point the row ID in the index to the row's new location.
  • E. Update statements can result in one or more chained rows.
Answer: C,D,E
Explanation:
A .True. Migration updates index ROWIDs.
B .True. Updates can migrate rows if space is insufficient.
C .True. Large updates can chain rows across blocks.
D .False. Chained rows may span blocks but aren't required to.
E .False. Inserts don't migrate; they chain if too large initially.

NEW QUESTION # 69
Which two statements describe how Optimizer Statistics are collected?
  • A. Optimizer Statistics are collected by the Statistics Advisor.
  • B. Optimizer Statistics are collected automatically by an automatic maintenance job that runsduring predefined maintenance windows.
  • C. Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.
  • D. Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.
  • E. Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.
Answer: B,D
Explanation:
Optimizer Statistics drive the cost-based optimizer's query plans. Let's dissect each option:
A . Optimizer Statistics are collected automatically by an automatic maintenance job that runs during predefined maintenance windows.
True. Oracle 23ai uses the AutoTask framework to gather stats automatically during maintenance windows (e.g., nightly 10 PM-2 AM). The GATHER_STATS_PROG job, managed by DBMS_AUTO_TASK_ADMIN, collects stats for stale or missing objects.
Mechanics:Controlled by STATISTICS_LEVEL=TYPICAL (default) and the DEFAULT_MAINTENANCE_PLAN. It prioritizes objects with >10% changes (stale stats) or no stats.
Practical Use:Ensures stats are current without manual intervention, critical for dynamic workloads.
Edge Caseisabled if STATISTICS_LEVEL=BASIC or the job is manually disabled via DBMS_AUTO_TASK_ADMIN.DISABLE.
B . Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.
False. Stats aren't updated in real-time; this would be too resource-intensive. Instead, Oracle tracks changes (e.g., via DBA_TAB_MODIFICATIONS) and updates stats periodically via AutoTask or manually. Real-time stats exist in 23ai for specific cases (e.g., GATHER_TABLE_STATS with REAL_TIME_STATS), but it's not the default.
Why Incorrect:Real-time collection would degrade performance for OLTP systems, contradicting Oracle's batch approach.
C . Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.
True. The DBMS_STATS package offers granular control: GATHER_TABLE_STATS, GATHER_SCHEMA_STATS, GATHER_DATABASE_STATS, etc., allowing stats collection for tables, schemas, or the entire database.
Mechanics:Example: BEGIN DBMS_STATS.GATHER_TABLE_STATS('HR', 'EMPLOYEES'); END;. Options like ESTIMATE_PERCENT and DEGREE fine-tune the process.
Practical Use:Used for immediate stats updates post-DML or for custom schedules outside maintenance windows.
Edge Case:Overuse can lock stats (e.g., FORCE=TRUE), requiring careful management.
D . Optimizer Statistics are collected by the Statistics Advisor.
False. The Statistics Advisor (new in 23ai) analyzes and recommends stats improvements but doesn't collect them. Collection is still via DBMS_STATS or AutoTask.
Why Incorrect:It's a diagnostic tool, not an executor.
E . Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.
False. AWR snapshots capture performance metrics (e.g., wait times), not optimizer stats. Stats collection is a separate process via AutoTask or manual commands.
Why Incorrect:AWR and stats collection serve distinct purposes-monitoring vs. optimization.

NEW QUESTION # 70
Which three statements are true about resumable space allocation in Oracle databases?
  • A. Resumable space allocation is only possible with locally managed tablespaces.
  • B. Resumable space allocation may be enabled for some sessions and not others.
  • C. All sessions must have the same timeout value when waiting for resumable space allocations.
  • D. A user's session may be suspended even if the user has the UNLIMITED TABLESPACE system privilege.
  • E. A user's session may be suspended and resumed multiple times.
  • F. The AFTER SUSPEND event trigger can itself be suspended due to space conditions.
Answer: B,D,E
Explanation:
A .True. Enabled per session with ALTER SESSION ENABLE RESUMABLE.
B .True. Multiple suspensions can occur in one session.
C .False. Works with dictionary-managed tablespaces too.
D .False. Timeout is session-specific.
E .True. Privilege doesn't prevent suspension; quota limits do.
F .False. Triggers execute but can't suspend themselves.

NEW QUESTION # 71
You have connected to the CDB root as a common user with the CREATE PLUGGABLE DATABASE system privilege and issued the following command: SQL> CREATE PLUGGABLE DATABASE pdb1 ADMIN USER admin1 IDENTIFIED BY p1 ROLES = (CONNECT) FILE_NAME_CONVERT = ('PDB$SEEDdir', 'PDB1dir'); Which three are results of the CREATE command?
  • A. The PDB must be opened Read Only to complete the integration of the PDB into the CDB.
  • B. It creates a new local user ADMIN with SYSDBA privileges.
  • C. After the PDB is created, it is automatically opened Read/Write.
  • D. It creates tablespaces to store metadata.
  • E. It creates a new local user ADMIN with restricted privileges.
  • F. It creates new default schemas for the PDB.
Answer: D,E,F
Explanation:
A .True. PDBs inherit default schemas from the seed.
B .True. Metadata tablespaces (e.g., SYSTEM, SYSAUX) are created.
C .False. ADMIN1 (not ADMIN) isn't granted SYSDBA.
D .False. No read-only requirement post-creation.
E .False. PDBs start in MOUNTED state, not open.
F .True. ADMIN1 is a local user with CONNECT role only.

NEW QUESTION # 72
Which three Oracle database space management features will work with both Dictionary and Locally managed tablespaces?
  • A. Online index segment shrink.
  • B. Automatic data file extension (AUTOEXTEND).
  • C. Online table segment shrink.
  • D. Capacity planning growth reports based on historical data in the Automatic Workload Repository (AWR).
  • E. Oracle Managed Files (OMF).
Answer: B,D,E
Explanation:
Dictionary-managed tablespaces (DMTs) use the data dictionary for extent management, whilelocally managed tablespaces (LMTs) use bitmaps. Let's evaluate compatibility:
A . Capacity planning growth reports based on historical data in the Automatic Workload Repository (AWR).
True. AWR tracks space usage (e.g., DBA_HIST_TBSPC_SPACE_USAGE) regardless of tablespace type, enabling growth reports for both DMTs and LMTs.
Mechanics:MMON collects metrics like segment growth, stored in SYSAUX, accessible via EM or scripts.
Practical Use:Helps predict when to add data files, universal across management types.
B . Online table segment shrink.
False. ALTER TABLE ... SHRINK SPACE requires LMTs with Automatic Segment Space Management (ASSM), unavailable in DMTs, which lack bitmap-based free space tracking.
Why IncorrectMTs use freelists, incompatible with shrink operations.
C . Online index segment shrink.
False. Like tables, ALTER INDEX ... SHRINK SPACE requires LMTs with ASSM, not supported in DMTs.
Why Incorrect:Same limitation as B; DMTs can't compact online.
D . Oracle Managed Files (OMF).
True. OMF automates file naming and placement (via DB_CREATE_FILE_DEST) for both DMTs and LMTs, agnostic to extent management.
Mechanics:Example: CREATE TABLESPACE ts1; creates an OMF file in either type.
Edge CaseMTs are rare in 23ai, but OMF still applies.
E . Automatic data file extension (AUTOEXTEND).
True. AUTOEXTEND ON allows data files to grow as needed, supported in both DMTs and LMTs since early versions.
Mechanics:ALTER DATABASE DATAFILE ... AUTOEXTEND ON NEXT 100M; works universally.

NEW QUESTION # 73
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