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Table Lock [message #642057]

Tue, 01 September 2015 07:24

stsivaraj
Messages: 1
Registered: September 2015
Location: Chennai

Junior Member

Hi,
I have a table Devices and am trying to insert 1000 records at a time using a single transaction. Suppose If I have 5 transaction and each transaction has 1000 records to insert. In this case, will all transaction will insert parallel or wait for each other to complete. My doubt is for each transaction acquire the table lock or row lock. Will it insert parallel mode or wait one transaction release other transaction.

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Re: Table Lock [message #642058 is a reply to message #642057]

Tue, 01 September 2015 07:29

cookiemonster
Messages: 13975
Registered: September 2008
Location: Rainy Manchester

Senior Member

Why don't you just try it?
You do have a test system to try these things on don't you?

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Re: Table Lock [message #642059 is a reply to message #642057]

Tue, 01 September 2015 07:40

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

stsivaraj wrote on Tue, 01 September 2015 05:24

Hi,
I have a table Devices and am trying to insert 1000 records at a time using a single transaction. Suppose If I have 5 transaction and each transaction has 1000 records to insert. In this case, will all transaction will insert parallel or wait for each other to complete. My doubt is for each transaction acquire the table lock or row lock. Will it insert parallel mode or wait one transaction release other transaction.

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Re: Table Lock [message #642060 is a reply to message #642057]

Tue, 01 September 2015 07:54

Michel Cadot
Messages: 68776
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Oracle does not use table lock on DML, only row locks.
have a look at Database Concepts.

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Re: Table Lock [message #642145 is a reply to message #642057]

Thu, 03 September 2015 21:02

shirleyhu
Messages: 4
Registered: August 2015
Location: AUSTRALIA

Junior Member

It depend on table structure for the locks . If there is primary key or unique index, row lock contention will be there to check the unique .Otherwise it just row lock .

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Re: Table Lock [message #642151 is a reply to message #642145]

Fri, 04 September 2015 00:53

Michel Cadot
Messages: 68776
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

This does not anything, locks in index is also a row (or key) lock.

Quote:

It depend on table structure for the locks

This is meaningless.
What is "table structure for the locks"? Something you made up?

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