CFLock identify anonymous locks and latches
I'm new to CFLock, but have recently read on staves cflock and variable, etc. I feel that I have a solid understanding of the situation. In the documentation, I found this snipit I'm having problems understanding."Lock scopes and names.
The cflock tag prevented concurrent access to sections of the code, not variables. If you have two sections of the code that access the same variable, they must be synchronized to prevent them from running at the same time. This by identifying the locks with the same scope or name attributes.
Note: ColdFusion does not require you to identify exclusive locks. If you omit the identifier, the lock is anonymous and you cannot synchronize the code in the tag cflock with another code block. Anonymous locks do not lead to errors when they protect a resource that is used in a single code block, but they are of bad programming practice. You must always identify read-only locks.
"
When they are referring to the anonymous locks, they suggest that you use the name option compared to the scope within the cflock tag option? See the examples below:
< name cflock = "Logoutcount" type = "exclusive" timeout = "10" >
< cfset application.logoutcount = application.logoutcount - 1 >
< / cflock >
OR
< cflock scope = "Application" type = "exclusive" timeout = "10" >
< cfset application.logoutcount = application.logoutcount - 1 >
< / cflock >
I guess that if the scope and / variable were the session level, I would just change the application to the session.
What I'm trying to get clarification on here is as well, herds must be created using the name attribute or the scope attribute. I can't find much in the way of documentation pertaining to this matter.
I think you're right. After I read your response, I re - read. I missed the sentence as follows "You do this by identifying the locks with the same scope or name attributes.".
Thanks for pointing it out. Makes sense!
Tags: ColdFusion
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locks and locks - an example?
Hi guys,.
I keep coming across these two terms, and I'm trying to conceptualize their. I understand why locks are needed on the resources (to me, this means tables, index, lines, sequences etc - maybe something else?). But I don't really know how to locks and latches should go. I have collected the following Googling autour.
VALVES:
Provide exclusive access only to the protected data structures
Request are not aligned, if a request fails, process, try later
Simple data structure
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LOCKS:
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If someone could give me a simple example to tell a very simple table and show how the lock and the lock will interact for a query on the table, it would help me a lot.
Thank you.Dear Oracleguy777,
Your welcome at any time, and Yes, this article of H.tonguc YIlmaz is excellent.
Soon :)
Francisco Munoz Alvarez
www.oraclenz.com -
Hi all
Hope, all do well.i need your valuable help, what is the difference between the lock and the latch, and when they occur in oracle db?
Thanks in advance.
Thank you and best regards.
https://asktom.Oracle.com/pls/Apex/f?p=100:11:0:P11_QUESTION_ID:10899066672589
http://docs.Oracle.com/CD/E11882_01/server.112/e40540/consist.htm#CNCPT1358
latch
Control of low-level serialization mechanism used to protect data structures shared in the SGA of simultaneous access.
lock
A database mechanism that prevents the destructive interaction between transactions accessing a shared resource such as a table object, line or invisible system for users. The main categories of locks are DML, DDL locks and locks and internal lock locks.
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< object edited by host >
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(139834)
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