Nest 0 Cart
Nest Account
Popular Exams
All Categories...
Nest
Nest 0
Contact
Log In / Sign Up
Copyright 2024 © store. All rights reserved.
Home Oracle 1z0-082

Oracle 1z0-082 Exam Practice Questions (P. 4)

  • Full Access (178 questions)
  • Six months of Premium Access
  • Access to one million comments
  • Seamless ChatGPT Integration
  • Ability to download PDF files
  • Anki Flashcard files for revision
  • No Captcha & No AdSense
  • Advanced Exam Configuration
Get Contributor Access
Question #16
Which three statements are true about dropping and unused columns in an Oracle database? (Choose three.)
  1. A
    A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
  2. B
    An UNUSED column's space is reclaimed automatically when the block containing that column is next queried.
  3. C
    An UNUSED column's space is reclaimed automatically when the row containing that column is next queried.
  4. D
    Partition key columns cannot be dropped.
  5. E
    A DROP COLUMN command can be rolled back
  6. F
    A column that is set to UNUSED still counts towards the limit of 1000 columns per table

Correct Answer:
ABF
chatbot-img GPT-4o - Answer
The ability to drop a primary key column that is referenced as a foreign key in another table is indeed feasible using the CASCADE option, effectively removing constraints that depend on that column as well. Further, when a column is marked as UNUSED, it remains a part of the table's column count toward the Oracle 1000 column limit, but does not reclaim its space automatically on block query; space reclamation involves more specific actions. Finally, dropping columns in Oracle is a DDL operation and cannot be undone with a rollback, making such actions immediately permanent upon execution. Understanding these nuances is key for precise database modifications and space management.

Question #17
Which two statements are true regarding Oracle database space management within blocks managed by Automatic Segment Space Management (ASSM)?
(Choose two.)
  1. A
    PCTFREE defaults to 10% for all blocks in all segments for all compression methods
  2. B
    ASSM assigns blocks to one of four fullness categories based on what percentage of the block is allocated for rows
  3. C
    Update operations always attempt to find blocks with free space appropriate to the length of the row being updated
  4. D
    Insert operations always attempt to find blocks with free space appropriate to the length of the row being inserted
  5. E
    A block will always be eligible for inserts if the row is short enough to fit into the block

Correct Answer:
CE
chatbot-img GPT-4o - Answer
In Oracle's Automatic Segment Space Management (ASSM), updates and inserts behave subtly differently. For updates, Oracle may reuse a previously occupied space within the same block if it's sufficient for the updated row size; it doesn't "always" seek out a block with the exact space fit. However, for inserts, ASSM makes an effort to find a block that can accommodate the full size of the new row, aiming to avoid row chaining, hence improving performance and space utilization. This distinction importantly highlights how Oracle manages space dynamically to balance efficiency and performance in database operations.

Question #18
Evaluate these commands which execute successfully:

Which two statements are true about the ORD_ITEMS table and the ORD_SEQ sequence? (Choose two.)
  1. A
    If sequence ORD_SEQ is dropped then the default value for column ORD_NO will be NULL for rows inserted into ORD_ITEMS
  2. B
    Any user inserting rows into table ORD_ITEMS must have been granted access to sequence ORD_SEQ
  3. C
    Column ORD_NO gets the next number from sequence ORD_SEQ whenever a row is inserted into ORD_ITEMS and no explicit value is given for ORD_NO
  4. D
    Sequence ORD_SEQ cycles back to 1 after every 5000 numbers and can cycle 20 times
  5. E
    Sequence ORD_SEQ is guaranteed not to generate duplicate numbers

Correct Answer:
BE

Question #19
Which three instance situations are possible with the Oracle Database server without multi-tenant? (Choose three.)
  1. A
    two or more instances on separate servers all associated with one database
  2. B
    one instance on one server associated with one database
  3. C
    one instance on one server associated with two or more databases on the same server
  4. D
    one instance on one server not associated with any database
  5. E
    one instance on one server associated with two or more databases on separate servers

Correct Answer:
CDE
chatbot-img GPT-4o - Answer
In the Oracle Database without multi-tenant architecture, it's essential to understand the relationships between instances and databases. An instance in Oracle directly relates to a single database, but specific configurations like Oracle Real Application Clusters (RAC) can allow two or more instances on separate servers to interact with a single database. Standalone, non-RAC configurations typically have one instance per database. It's also crucial to know that an instance can exist without being associated with any database, which corresponds to scenarios where the database is in a NOMOUNT or MOUNTED state. Options A, B, and D are correct, reflecting valid operational scenarios in Oracle Database environments.

Question #20
Which two statements are true about the ORDER BY clause when used with a SQL statement containing a SET operator such as UNION? (Choose two.)
  1. A
    Column positions must be used in the ORDER BY clause
  2. B
    Only column names from the first SELECT statement in the compound query are recognized
  3. C
    The first column in the first SELECT of the compound query with the UNION operator is used by default to sort output in the absence of an ORDER BY clause
  4. D
    Each SELECT statement in the compound query must have its own ORDER BY clause
  5. E
    Each SELECT statement in the compound query can have its own ORDER BY clause

Correct Answer:
BE
chatbot-img GPT-4o - Answer
When utilizing the ORDER BY clause in conjunction with a SET operator such as UNION, it is essential to be aware that only the column names from the first SELECT statement in the combined query are recognized and subsequently usable in the ORDER BY clause. This is a crucial detail for effectively managing how data is presented, ensuring accurate application and anticipation of query results in Oracle SQL practices. Additionally, remember that an ORDER BY clause must apply to the entire set operation, binding coherence to the data output, as it cannot be used independently within each SELECT statement in UNION queries.

Previous Questions Next Questions

All Pages