Handle concurrency when insertion depends on readingConcurrency with Select-conditional Insert/Update/Delete...

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Handle concurrency when insertion depends on reading


Concurrency with Select-conditional Insert/Update/Delete - PostgreSQLHandling concurrent updates, inserting if and only if no record already existsHow to handle too many inserts?Azure SQL Database “Login failed for user” in application, but works fine in SSMSconcurrent insertion in mutually exclusive tables in oracleBest practice regarding concurrency for INSERT into a table with composite primary key?Azuredb The database 'tempdb' has reached its size quotaSQL Server Object ConcurrencyInserts and updates request an Sch-M lockHistory table implementation: “Tuple-versioning” vs Effective Date













3















[Short]



I have the following situation: user A attempts to insert data DA into the database. To check whether user A is allowed to insert DA, I need to run a query and do some computation. The problem I'm running into is that while I do the computation, another user (B) also attempts to insert data into the database. Now, suppose both users read the information needed for the computation before new data is inserted, then they might both get cleared for insertion whilst data from user A would forbid user B from inserting, thus leaving the database in a inconsistent state.



How can I solve this kind of concurrency in Azure SQL Database V12?



[Detailed]



The data the user is inserting is the beginning and end of a time interval, such as start: 6:00, end: 7:00.
The requirement is that there must be no time interval overlaps. This means that intervals start: 6:00, end: 9:00 and start: 5:00, end: 6:00 can't both exist.
Currently what I'm doing is checking whether there are any rows that overlap the new interval the user is trying to insert using the following query:



SELECT COUNT(*) FROM [Table1] WHERE Start <= attempEnd && End >= attemptStart


Now, the problem is that multiple users might be trying to insert an interval and these new intervals might overlap each other. However, this information might not be available at the time the query above runs, which causes overlapping intervals being inserted.



How can I solve this kind of concurrency in Azure SQL Database V12?










share|improve this question
















bumped to the homepage by Community 1 min ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
















  • There's a constraint-only solution for storing intervals of time with no overlaps by Alex Kuznetsov, if you'd like to take a look.

    – Andriy M
    Nov 9 '16 at 7:26






  • 1





    Wow @AndriyM, that is a bit complicated but sort of elegant. For the case at hand it might make inserting rows tricky if you're trying to insert into a hole in the range.

    – mendosi
    Nov 9 '16 at 10:40
















3















[Short]



I have the following situation: user A attempts to insert data DA into the database. To check whether user A is allowed to insert DA, I need to run a query and do some computation. The problem I'm running into is that while I do the computation, another user (B) also attempts to insert data into the database. Now, suppose both users read the information needed for the computation before new data is inserted, then they might both get cleared for insertion whilst data from user A would forbid user B from inserting, thus leaving the database in a inconsistent state.



How can I solve this kind of concurrency in Azure SQL Database V12?



[Detailed]



The data the user is inserting is the beginning and end of a time interval, such as start: 6:00, end: 7:00.
The requirement is that there must be no time interval overlaps. This means that intervals start: 6:00, end: 9:00 and start: 5:00, end: 6:00 can't both exist.
Currently what I'm doing is checking whether there are any rows that overlap the new interval the user is trying to insert using the following query:



SELECT COUNT(*) FROM [Table1] WHERE Start <= attempEnd && End >= attemptStart


Now, the problem is that multiple users might be trying to insert an interval and these new intervals might overlap each other. However, this information might not be available at the time the query above runs, which causes overlapping intervals being inserted.



How can I solve this kind of concurrency in Azure SQL Database V12?










share|improve this question
















bumped to the homepage by Community 1 min ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
















  • There's a constraint-only solution for storing intervals of time with no overlaps by Alex Kuznetsov, if you'd like to take a look.

    – Andriy M
    Nov 9 '16 at 7:26






  • 1





    Wow @AndriyM, that is a bit complicated but sort of elegant. For the case at hand it might make inserting rows tricky if you're trying to insert into a hole in the range.

    – mendosi
    Nov 9 '16 at 10:40














3












3








3


0






[Short]



I have the following situation: user A attempts to insert data DA into the database. To check whether user A is allowed to insert DA, I need to run a query and do some computation. The problem I'm running into is that while I do the computation, another user (B) also attempts to insert data into the database. Now, suppose both users read the information needed for the computation before new data is inserted, then they might both get cleared for insertion whilst data from user A would forbid user B from inserting, thus leaving the database in a inconsistent state.



How can I solve this kind of concurrency in Azure SQL Database V12?



[Detailed]



The data the user is inserting is the beginning and end of a time interval, such as start: 6:00, end: 7:00.
The requirement is that there must be no time interval overlaps. This means that intervals start: 6:00, end: 9:00 and start: 5:00, end: 6:00 can't both exist.
Currently what I'm doing is checking whether there are any rows that overlap the new interval the user is trying to insert using the following query:



SELECT COUNT(*) FROM [Table1] WHERE Start <= attempEnd && End >= attemptStart


Now, the problem is that multiple users might be trying to insert an interval and these new intervals might overlap each other. However, this information might not be available at the time the query above runs, which causes overlapping intervals being inserted.



How can I solve this kind of concurrency in Azure SQL Database V12?










share|improve this question
















[Short]



I have the following situation: user A attempts to insert data DA into the database. To check whether user A is allowed to insert DA, I need to run a query and do some computation. The problem I'm running into is that while I do the computation, another user (B) also attempts to insert data into the database. Now, suppose both users read the information needed for the computation before new data is inserted, then they might both get cleared for insertion whilst data from user A would forbid user B from inserting, thus leaving the database in a inconsistent state.



How can I solve this kind of concurrency in Azure SQL Database V12?



[Detailed]



The data the user is inserting is the beginning and end of a time interval, such as start: 6:00, end: 7:00.
The requirement is that there must be no time interval overlaps. This means that intervals start: 6:00, end: 9:00 and start: 5:00, end: 6:00 can't both exist.
Currently what I'm doing is checking whether there are any rows that overlap the new interval the user is trying to insert using the following query:



SELECT COUNT(*) FROM [Table1] WHERE Start <= attempEnd && End >= attemptStart


Now, the problem is that multiple users might be trying to insert an interval and these new intervals might overlap each other. However, this information might not be available at the time the query above runs, which causes overlapping intervals being inserted.



How can I solve this kind of concurrency in Azure SQL Database V12?







sql-server concurrency azure-sql-database-v12






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 9 '16 at 7:16









Andriy M

16.1k63373




16.1k63373










asked Nov 9 '16 at 0:21









victorvictor

1438




1438





bumped to the homepage by Community 1 min ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.







bumped to the homepage by Community 1 min ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.















  • There's a constraint-only solution for storing intervals of time with no overlaps by Alex Kuznetsov, if you'd like to take a look.

    – Andriy M
    Nov 9 '16 at 7:26






  • 1





    Wow @AndriyM, that is a bit complicated but sort of elegant. For the case at hand it might make inserting rows tricky if you're trying to insert into a hole in the range.

    – mendosi
    Nov 9 '16 at 10:40



















  • There's a constraint-only solution for storing intervals of time with no overlaps by Alex Kuznetsov, if you'd like to take a look.

    – Andriy M
    Nov 9 '16 at 7:26






  • 1





    Wow @AndriyM, that is a bit complicated but sort of elegant. For the case at hand it might make inserting rows tricky if you're trying to insert into a hole in the range.

    – mendosi
    Nov 9 '16 at 10:40

















There's a constraint-only solution for storing intervals of time with no overlaps by Alex Kuznetsov, if you'd like to take a look.

– Andriy M
Nov 9 '16 at 7:26





There's a constraint-only solution for storing intervals of time with no overlaps by Alex Kuznetsov, if you'd like to take a look.

– Andriy M
Nov 9 '16 at 7:26




1




1





Wow @AndriyM, that is a bit complicated but sort of elegant. For the case at hand it might make inserting rows tricky if you're trying to insert into a hole in the range.

– mendosi
Nov 9 '16 at 10:40





Wow @AndriyM, that is a bit complicated but sort of elegant. For the case at hand it might make inserting rows tricky if you're trying to insert into a hole in the range.

– mendosi
Nov 9 '16 at 10:40










2 Answers
2






active

oldest

votes


















0














If I understand correctly, you are doing two separate statements. First check to see if insert is okay, then second do the insert.



I wonder if a trigger might be a solution to your woes. I haven't any experience with creating triggers specifically in Azure, but try something like this:



Create Trigger tr_insertTimeRange On [Table1] For Insert As
Begin
If 1 < (
Select Count(*)
From [Table1] As t
Join Inserted As i
On t.attemptEnd >= i.attemptStart
Or t.attemptStart <= i.attemptEnd)
Begin
Raiserror ('Error!', 12, 1);
Rollback Transaction;
End
End
Go


After the data is inserted, it counts how many rows in the table overlap the time range of the inserted row. If there are more than 1 (remember, the row has already been inserted so it will overlap) then the transaction is rolled back.






share|improve this answer
























  • What guarantees that the trigger query wont suffer the same concurrency problems?

    – victor
    Nov 9 '16 at 20:34











  • @victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

    – mendosi
    Nov 9 '16 at 20:44





















0














You can always put in a unique index (clustered or not) on the table to prevent the overlap. This would enforce the business logic by ensuring that only one can succeed.



Another option would be to set the transaction level to serializable which will prevent the problem but probably excessively bottleneck the app.






share|improve this answer


























  • I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

    – mendosi
    Nov 9 '16 at 6:37











  • @mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

    – Erik
    Nov 9 '16 at 6:48













  • How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

    – victor
    Nov 9 '16 at 12:21











  • @victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

    – Erik
    Nov 9 '16 at 13:59











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









0














If I understand correctly, you are doing two separate statements. First check to see if insert is okay, then second do the insert.



I wonder if a trigger might be a solution to your woes. I haven't any experience with creating triggers specifically in Azure, but try something like this:



Create Trigger tr_insertTimeRange On [Table1] For Insert As
Begin
If 1 < (
Select Count(*)
From [Table1] As t
Join Inserted As i
On t.attemptEnd >= i.attemptStart
Or t.attemptStart <= i.attemptEnd)
Begin
Raiserror ('Error!', 12, 1);
Rollback Transaction;
End
End
Go


After the data is inserted, it counts how many rows in the table overlap the time range of the inserted row. If there are more than 1 (remember, the row has already been inserted so it will overlap) then the transaction is rolled back.






share|improve this answer
























  • What guarantees that the trigger query wont suffer the same concurrency problems?

    – victor
    Nov 9 '16 at 20:34











  • @victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

    – mendosi
    Nov 9 '16 at 20:44


















0














If I understand correctly, you are doing two separate statements. First check to see if insert is okay, then second do the insert.



I wonder if a trigger might be a solution to your woes. I haven't any experience with creating triggers specifically in Azure, but try something like this:



Create Trigger tr_insertTimeRange On [Table1] For Insert As
Begin
If 1 < (
Select Count(*)
From [Table1] As t
Join Inserted As i
On t.attemptEnd >= i.attemptStart
Or t.attemptStart <= i.attemptEnd)
Begin
Raiserror ('Error!', 12, 1);
Rollback Transaction;
End
End
Go


After the data is inserted, it counts how many rows in the table overlap the time range of the inserted row. If there are more than 1 (remember, the row has already been inserted so it will overlap) then the transaction is rolled back.






share|improve this answer
























  • What guarantees that the trigger query wont suffer the same concurrency problems?

    – victor
    Nov 9 '16 at 20:34











  • @victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

    – mendosi
    Nov 9 '16 at 20:44
















0












0








0







If I understand correctly, you are doing two separate statements. First check to see if insert is okay, then second do the insert.



I wonder if a trigger might be a solution to your woes. I haven't any experience with creating triggers specifically in Azure, but try something like this:



Create Trigger tr_insertTimeRange On [Table1] For Insert As
Begin
If 1 < (
Select Count(*)
From [Table1] As t
Join Inserted As i
On t.attemptEnd >= i.attemptStart
Or t.attemptStart <= i.attemptEnd)
Begin
Raiserror ('Error!', 12, 1);
Rollback Transaction;
End
End
Go


After the data is inserted, it counts how many rows in the table overlap the time range of the inserted row. If there are more than 1 (remember, the row has already been inserted so it will overlap) then the transaction is rolled back.






share|improve this answer













If I understand correctly, you are doing two separate statements. First check to see if insert is okay, then second do the insert.



I wonder if a trigger might be a solution to your woes. I haven't any experience with creating triggers specifically in Azure, but try something like this:



Create Trigger tr_insertTimeRange On [Table1] For Insert As
Begin
If 1 < (
Select Count(*)
From [Table1] As t
Join Inserted As i
On t.attemptEnd >= i.attemptStart
Or t.attemptStart <= i.attemptEnd)
Begin
Raiserror ('Error!', 12, 1);
Rollback Transaction;
End
End
Go


After the data is inserted, it counts how many rows in the table overlap the time range of the inserted row. If there are more than 1 (remember, the row has already been inserted so it will overlap) then the transaction is rolled back.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 9 '16 at 5:10









mendosimendosi

1,974520




1,974520













  • What guarantees that the trigger query wont suffer the same concurrency problems?

    – victor
    Nov 9 '16 at 20:34











  • @victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

    – mendosi
    Nov 9 '16 at 20:44





















  • What guarantees that the trigger query wont suffer the same concurrency problems?

    – victor
    Nov 9 '16 at 20:34











  • @victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

    – mendosi
    Nov 9 '16 at 20:44



















What guarantees that the trigger query wont suffer the same concurrency problems?

– victor
Nov 9 '16 at 20:34





What guarantees that the trigger query wont suffer the same concurrency problems?

– victor
Nov 9 '16 at 20:34













@victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

– mendosi
Nov 9 '16 at 20:44







@victor This would prevent inconsistent data, put it wouldn't prevent multiple users from attempting to modify the data at the same time. One of them will fail and should know that they failed.

– mendosi
Nov 9 '16 at 20:44















0














You can always put in a unique index (clustered or not) on the table to prevent the overlap. This would enforce the business logic by ensuring that only one can succeed.



Another option would be to set the transaction level to serializable which will prevent the problem but probably excessively bottleneck the app.






share|improve this answer


























  • I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

    – mendosi
    Nov 9 '16 at 6:37











  • @mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

    – Erik
    Nov 9 '16 at 6:48













  • How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

    – victor
    Nov 9 '16 at 12:21











  • @victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

    – Erik
    Nov 9 '16 at 13:59
















0














You can always put in a unique index (clustered or not) on the table to prevent the overlap. This would enforce the business logic by ensuring that only one can succeed.



Another option would be to set the transaction level to serializable which will prevent the problem but probably excessively bottleneck the app.






share|improve this answer


























  • I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

    – mendosi
    Nov 9 '16 at 6:37











  • @mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

    – Erik
    Nov 9 '16 at 6:48













  • How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

    – victor
    Nov 9 '16 at 12:21











  • @victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

    – Erik
    Nov 9 '16 at 13:59














0












0








0







You can always put in a unique index (clustered or not) on the table to prevent the overlap. This would enforce the business logic by ensuring that only one can succeed.



Another option would be to set the transaction level to serializable which will prevent the problem but probably excessively bottleneck the app.






share|improve this answer















You can always put in a unique index (clustered or not) on the table to prevent the overlap. This would enforce the business logic by ensuring that only one can succeed.



Another option would be to set the transaction level to serializable which will prevent the problem but probably excessively bottleneck the app.







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 9 '16 at 6:49

























answered Nov 9 '16 at 6:04









ErikErik

3,97931954




3,97931954













  • I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

    – mendosi
    Nov 9 '16 at 6:37











  • @mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

    – Erik
    Nov 9 '16 at 6:48













  • How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

    – victor
    Nov 9 '16 at 12:21











  • @victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

    – Erik
    Nov 9 '16 at 13:59



















  • I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

    – mendosi
    Nov 9 '16 at 6:37











  • @mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

    – Erik
    Nov 9 '16 at 6:48













  • How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

    – victor
    Nov 9 '16 at 12:21











  • @victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

    – Erik
    Nov 9 '16 at 13:59

















I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

– mendosi
Nov 9 '16 at 6:37





I thought about a check constraint too, but how would you design this check constraint to get the desired effect?

– mendosi
Nov 9 '16 at 6:37













@mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

– Erik
Nov 9 '16 at 6:48







@mendosi Good point I should have said a unique index clustered or not. It is late and I'm answering on my phone while watching the US election results

– Erik
Nov 9 '16 at 6:48















How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

– victor
Nov 9 '16 at 12:21





How woul you add a unique constraint to something that is computed? Remember that this is not a simple comparison of the start and end of the interval. How can I store the interval itself so that I can make it unique

– victor
Nov 9 '16 at 12:21













@victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

– Erik
Nov 9 '16 at 13:59





@victor An indexed view might be able to do the trick. I would need to have the table schema to try and write the view though and have a chance to ingest some caffeine. This whole plan might be unworkable though. I'm not at my best while watching politics late at night

– Erik
Nov 9 '16 at 13:59


















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