Questions tagged [read-uncommitted]
49 questions
0
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1 answer
EF Read-Uncommitted for all select queries
Since I'm having very long-lasting lock issues on my table records...
would it be correct to use the "Read-Uncommitted" transaction isolation level for all select queries of Entity Framework 6 in my ASP.Net MVC web-app with SQL-Server database?
What…
jangix
- 49
- 7
0
votes
2 answers
READ UNCOMMITTED and Estimates
From time to time, I want to run a stored procedure to get a rough estimate of how many records in two or three different tables satisfy some criteria. If during this estimate new records are added, deleted or updated, there is not really a problem…
B.M
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2 answers
Can ReadUncommitted know all LOWER auto-increment IDs that will exist?
Suppose we have a table with an auto-increment primary key. I want to load all IDs greater than the last ID I have seen.
SELECT id
FROM mytable
WHERE id > 10;
With the naive approach, I risk skipping IDs:
Transaction 1 claims ID 11.
Transaction 2…
Timo
- 7,992
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0 answers
How to read uncommitted data from other table inside trigger
I have 2 tables, Contact and ContactFunction. They have a One to Many relationship, as in a Contact can have many ContactFunctions. So ContactFunction has ContactID as a foreign key. So in my .NetCore web application I can update a contact and their…
Del Habington
- 17
- 7
0
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1 answer
MySQL dirty reads vs dirty reads defined in SQL standard
From MySQL manual:
READ UNCOMMITTED
SELECT statements are performed in a nonlocking fashion, but a possible earlier version of a row might be used. Thus, using this isolation level, such reads are not consistent. This is also called a dirty read.…
Croco
- 326
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- 12
0
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1 answer
How to verify TransactionScope works with MySQL?
I want to add read uncommitted isolation level.i know it is possible to do with SQL statement. but I want to try with TransactionScope and I tried but not getting any isolation statements on MySQL general logs.
Questions
1 does transactionscope…
Atulya
- 153
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- 11
0
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1 answer
Running stored procedure in a SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
I setup a DbContext where I have this code:
base.Database.ExecuteSqlCommand("SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
in the context constructor. I execute a stored procedure like this:
return base.Database.ExecuteSqlCommand("EXEC…
Victor A Chavez
- 181
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- 19
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0 answers
SqlXml throws NullReferenceException
I have a trouble. :(
MS SQL Server 2016 13.0.15900.1
.NET Framework 4.5.2
There is a table with large xml fields (> 1 mb)
A terrible procedure which read, change and update [xmlField] with(out) XPath
The procedure selects [xmlField] from [myTable]…
Lunar Whisper
- 210
- 1
- 6
0
votes
0 answers
Sql Server read uncommitted field level variance?
If my connection allows dirty reads, is it possible that I would get inconsistent results from multiple fields of the same row? Example:
Connection 1:
Update table1 set col1 = 1, col2 = 1 where primarykey = 1
Update table2 set col1 = 2, col2 = 2…
Elroy Flynn
- 3,032
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1 answer
SET TRANSACTION isolation level READ uncommitted - is it necessary to explicitly use transaction begin and end?
Does this query below work or do I have use explicitly transaction being and end?
Yes I know the dangers of the read uncommitted
SET TRANSACTION isolation level READ uncommitted
SELECT TOP 100 tblguilds.guild_id,
…
Furkan Gözükara
- 22,964
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1 answer
SQL Server Isolation level real world example
Let's say we need to develop a bidding application such as one in eBay. We don't want one user's bidding to block another user's bidding, which will result in slow response. Also, when I place a bid based on the highest price I see, I don't want to…
Kenny
- 1,902
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0
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1 answer
Why does 'read uncommited' isolation level allow locks?
I put a breakpoint in my code to pause the execution before transaction is commited or rolled back. Then I'd like to see the current state of the database, but when I set in ssms the transaction isolation level to read uncommited and run the query…
Pavel Voronin
- 13,503
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SQL Server Update Locks
If you have the following sql, is it possible that if it is run multiple times by many different processes at exactly the same time, that two or more processes may update the table?
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
UPDATE table
SET…
stormCloud
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How to read uncommitted data in nHibernate transaction?
I would like to know to know how to read uncommitted data. I have an application which is saving an entry into table1 and then tries to read some entry from same table. I am unable to do that because the data gets locked between begin transaction…
Arti
- 2,993
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Read modified and yet uncommitted data
select .. WITH UR ignores locks and gives only currently committed data
how to read data that are not committed ?
as in Oracle :
update table set ..
select .. gives modified and yet uncommitted data
Ben
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