Pessimistic locking worst case -

-

We are using JavaEE and creating an appellation, where in the worst case, the message queue robbed the message Come in the form of a single user.

So we are considering pessimistic, select theory for locking the theory and solve our problems in fisrt trials.

But we are afraid of Deadlock. Classical people: User X Lock A, the user locks the YB lock But there are a lot of suspicious: system crash, network work, ... and so on. The database is not locking the system, not knowing the reason for it. We will use modern databases such as: Oracle, MS SQL and Postgrescill.

What do we want to know, the pessimistic locking used in production and the prospects of the candidates?

Thanks in advance!

The worst problem I have seen with pessimistic locking is the mandatory bottleneck that the database is created < / P>

In other words, your code is stopping deadlock at the app level (as you say in your post), the display becomes problem - drops throughput because only 1 user at a time One can update the set of data.

It is possible that the locked table is locked, if a system exception occurs, then select for update is executed but not committed, but It is not large enough (though it clearly depends on your code). I have not seen it through any issue related to basic infrastructure, but only through application errors.

If possible, by batching updates you can reduce the tootope problem to some extent, but it really depends on your particular situation.

Comments

Post a Comment

Popular posts from this blog

excel vba - How to delete Solver(SOLVER.XLAM) code -

-
After opening several examples of macro / code written, I suddenly get stuck with a code that seems safe. Solver (SOLVER.XLAM) is doing this notation and I would like to remove it from my system. I do not think this is a relativant code. Can anyone tell me what should I do? I have already installed something to remove the password but Solver is still asking for password and I can not get rid of it! itemprop = "text"> Solver Excel is add-in If you want to delete it, then Excel Application & gt; Options & gt; Add-ins & gt; Search for 'Go to' button and gt; Uncheck the solver on the list like press something (I can not give you the exact path because I have the Polish version of Excel). Trying to open Solver's VBA code is not good because it There is allegedly copyright. Besides, I do not think Solver creates any disadvantages while working with Excel or VBA.
Read more

github - Teamcity & Git - PR merge builds - anyway to get HEAD commit hash? -

-
I have a team city build project with Gitbab VCS route, I have been triggered for both / head on PR and / Merge the referee. The annoying thing is that you can not do anything useful with the merged hash - it is not present in Gitobb. I want to exclude newsgate packages with head in gutub comet situations in the version number along with Hewash (Newsaging 7) for the music build, but against head hash. However, I can not see a way to get the head hashes while constructing that merge. I just want to head because it's useless - we only care about merge. (PR - Pull Request) This command works reliably while running One on / merge is git log --no-merge -1 ---- = '% h'
Read more

ios - Replace text in UITextView run slowly -

-
I have a UITextView and I change a word like the code at the end of UITextView.text: - (void) Replace TexttechWitWord: (NSString *) word {NSString * currentTextViewText = self.textView.text; CurrentTextViewText = [currentTextViewText stringByReplacingCharactersInRange: NSMakeRange ([self.textView.text length] - [word length], [word length]) withString: word; Self.textView.text = currentTextViewText; } Replacement work is fine, but it runs very slowly and very slowly when the textView now lengthens Is there any better way? I try the replacement range: with text for a week but still stuck. Not to know how to use it to replace it in your case. Please guide! Thanks in advance! This is an important job. As you are using an irreversible string and you are creating a very long string and before Assigned to NSString created from. NSString will be used instead of NSMutableString . - (UITableViewCell *) TableView: (UITableView *) Table View CellForOutPath: (NSIndex...
Read more