Users' questions

How much space is an Oracle table using?

How much space is an Oracle table using?

Use the radio button to select the table you want to look at and click on Edit (Don’t click on the table name link) Click on the Segments tab (and wait…) You will see the size of the table data and the indexes used.

How do you break a table lock in Oracle?

Answer: The only way to release a lock on an Oracle table is to kill the session that is holding the lock, or wait for the transaction to complete.

Which table is locked in Oracle?

You can check table lock from v$lock and dba_objects view. Below query will give you the lock details. Select the session id and kill the process which is holding the lock on schema user.

What are different types of locks in Oracle?

There are five different types of locks in Oracle, and they are: exclusive, shared, shared row exclusive, row shared, and row exclusive….Exercises

  • What is a lock?
  • Describe the meaning of a shared lock and an exclusive lock.

What does table lock do in Oracle Database?

Table lock is very common in Oracle database and v$lock is used to check the process and the blocking session. To check and release the lock you need to kill the session holding the lock. Query 1: To find sid, serial# and process of locked object.

Why are there so many locked objects in Oracle?

where . . . The majority of locking issues within Oracle are the result of application design within database applications. One root cause of such lock contention problems lies in a basic misunderstanding of the Oracle locking model. Developers often assume incorrectly that database locking is the same across different platforms.

Is there a limit on row level locking in Oracle?

Answer: First, note these Oracle lock scripts and Oracle deadlocks. Because Oracle row locks are managed internally, there is no limit on row-level locking and it is never necessary to perform “lock escalation” as you might see in lesser database systems.

How are row locks acquired in Oracle DML?

The Oracle database provides the mechanism by which row locks acquire automatically for the DML statements mentioned above. Whenever a transaction obtains row locks for a row, it also acquires a table lock for the corresponding table.