sql - What type of Transaction IsolationLevel should be used to ignore inserts but lock the selected row? -


I have a process that starts a transaction, inserts a record in Table 1, and then a Long moving web service (up to 30 seconds) If the web service call fails then the merger is brought back (which we want). Here is an example of the inclusion (this is actually several entries in multiple tables, but I am making it simple for this question): 

  INSERT in table 1 (User ID, Statistic) values (@UserId, 1)

I have another process that asks Table 1 in the first step: 

  SELECT TOP 1 * to Table 1 Where position type = 2

and then updates that line for that user. When the process 1 is running, the table 1 gets locked, the process 2 will not complete until the process 1 ends, which is a problem because a long delay is introduced, while the process 1 will be your web service Ends the call.

Process 1 Enter a StatusTypeId of only 1 and it is only an operation that is included in Table1 process 2 will inquire only on StatusTypeId = 2. I want to tell Process 2 to ignore any insertion in Table 2, but blocks the line that he chooses. Default isolation level for Process 2 is waiting too much, but I'm afraid algaevalaval. Read permission allows reading too much dirty data. I do not want two users to run Process 2 and then accidentally get the same line

Is there a separate isolation to use other than Reddit, which says that focus on the lines inserted Do not give, but make sure to select the selected row select locks?

This topic should be blocked from being included in the selection by providing the appropriate indexes.

Test table. 

  Insert table 1 (UNID INIT primary key, StatStipId INT, one more column varchar (50)) from Table 1 to selected number (LN (type)% 2) 1, NIID ( ) From MasterDisco. Spt_values ​​where type = 'P'

query window one 

  BEGIN TRAN Table 1 (User ID, Statistic ID) values Include (5000, 1) WAITFOR DELAY '00: 01 '; Rollback

query window two (block) 

  SELECT TOP 1 * from table 1 where position type = 2 command other column

But if you try again after adding an index, then it will not block Table 1 (StatCat ID, AOC column) on nonclassed index ix

Regarding locking rows for your code> Process 2 You can use the following ( READPAST Signal 2 will allow concurrent process 2 to begin the process of different rows instead of blocking each other) You can search relevant by Remus Rusanu 

  Back Tran with Top 1 * (UPDLOCK, READPAST) where the position = 2 order other column / * rest of the code two code * / COMMIT

-

Comments

Post a Comment

Popular posts from this blog

Eclipse CDT variable colors in editor -

I hope this is a good question to ask here. This programming is related, so I thought it would be better than the superuser, so I am using the CDT C ++ Eclipse plugin. I know how the editor changes colors for some things But is there a way to do that all the variables are different colors? For example in KDEValue, it sets the local variables and square variables in different colors and bold square squares. Can I copy it to CDT? Eclips provides some level of color customization for text editor syntax You can see it on the following: There are many elements, including the Window> Preferences> C / C ++> Editor> Syntax color code that can be changed, assembly, Comments, Preprocessor and Doxian Under the code, it is possible to change the color of some variable types, such as global variables, local variable announcements, local variable references, and parameter variables. But I do not think the code is capable of changing the color of each variable declared....
Read more

AJAX doesn't send POST query -

$ (दस्तावेज़) .ready (function () {function ajaxselectrss (rssurlvar) {var ajaxRequest; // वेरिएबल जो अजाक्स को संभव बनाता है! कोशिश करें कि {// ओपेरा 8.0+, फ़ायरफ़ॉक्स, सफारी अजाक्स अनुरोध} = नया एक्सएमएलएचटीपीआरइवेस्ट ();} कैच (ई) {// इंटरनेट एक्सप्लोरर ब्राउज़र्स {ajaxRequest = new ActiveXObject ("Msxml2.XMLHTTP");} पकड़ो (ई) {try {ajaxRequest = new ActiveXObject ("Microsoft.XMLHTTP");} कैच (ई) {// कुछ गलत चेतावनी ("आपका ब्राउज़र तोड़ दिया!"); वापसी झूठी;}}} // एक बनाएं फ़ंक्शन जो सर्वर से भेजे गए डेटा प्राप्त करेंगे ajaxRequest.onreadystatechange = function () {if (ajaxRequest.readyState == 4) {var ajaxDisplay = document.getElementById ('news'); ajaxDisplay.innerHTML = ajaxRequest.responseText;}} / / Var rssurlvar = $ (this) .attr ("title"); var queryString = "rurl =" + rssurlvar; var urltofile = "rssget.php"; ajaxRequest.open ("पोस्ट", urltofile, सच); ajaxRequ Est.setRequestHeader ("सामग्री-प्र...
Read more

wpf - Custom Message Box Advice -

Well, I'm using a custom window box that comes with some custom control boxes that accompany the text The producers who are displayed are called. I have a defined event, which has been subscribed through the original class, it gets burnt when clicking on the button. However, I can not see how to use it effectively, I would like to return one yes, whether yes or not, but obviously my code will continue to execute, so this Below is some example code to clarify the problem that the method has subscibed by clicking on the button. Message box window Public partial class custom message box: window {public representative message messagebox object sender, event events e); Public event messagebox handler messagebox document; Public Customs Box () {Initial group (); } Public Customsbox (String Message) {InitializeComponent (); This.txtdescription.Text = Message; } Public Customsbox (String Message, String Title, String First BTNtext) {Initialization (); This.lbltitle.Content =...
Read more