isolation-level Questions
10
Solved
How long should it take to run
ALTER DATABASE [MySite] SET READ_COMMITTED_SNAPSHOT ON
I just ran it and it's taken 10 minutes.
How can I check if it is applied?
Gritty asked 24/10, 2008 at 2:51
0
This directly relates to this other question, as a natural follow-up question (which was asked in comments, but was never replied to).
Textual description
Assuming:
the application uses the defaul...
Servais asked 27/1, 2022 at 4:18
2
Solved
Wikipedia describes the Phantom read phenomenon as:
A phantom read occurs when, in the course of a transaction, two identical queries are executed, and the collection of rows returned by the sec...
Rheology asked 26/1, 2015 at 6:43
3
Solved
I know that in the SQL standard there are four isolation levels when dealing with transactions:
READ UNCOMMITTED - will allow everything
READ COMMITTED - will not allow dirty reads
REPEATABLE READ...
Fredra asked 30/11, 2015 at 14:25
6
Solved
How do you find current database's transaction level on SQL Server?
Watereddown asked 24/6, 2009 at 12:39
2
Solved
I learnt Node.js is single-threaded and non-blocking. Here I saw a nice explanation How, in general, does Node.js handle 10,000 concurrent requests?
But the first answer says
The seemingly mysteri...
Gallfly asked 12/1, 2021 at 3:58
2
Solved
The documentation I've run across researching this indicates that the way to do it for other databases is to use multiple statements in your query, a la:
>>> cursor = connection.cursor()
...
Guttering asked 15/4, 2011 at 13:17
2
I've read Martin Fowler's book chapter Optimistic Offline Lock
Author describes following example(if I understood it correctly):
There are 2 entites: Order and Client. There are 2 transactions(bu...
Brucite asked 14/10, 2019 at 21:13
3
Solved
maybe you can shed light on something for me here:
DB = MySQL 5.7
Storage engine: InnoDB
Isolation level: Repeatable Read
Following table:
---------------
| MyTable |
---------------
| PK | Co...
Avoirdupois asked 11/12, 2019 at 14:20
4
Solved
I am trying to understand read committed and read uncommitted isolation levels. I know that theoreticay read uncommitted allows dirty reads and read committed doesn't, but I still can't really unde...
Glisson asked 6/1, 2019 at 15:39
2
Solved
I have set isolation level in C# code as readcommitted, and I am calling a stored procedure which is timing out due to some reason. The stored procedure does not have any set isolation level statem...
Sunglasses asked 21/5, 2019 at 18:48
2
Solved
Does it matter for a SERIALIZABLE transaction if any other session uses e.g. autocommit or the READ COMMITED isolation level?
In other words is there any danger in mixing isolation levels (& a...
Harvestman asked 22/5, 2014 at 11:8
2
Solved
I am trying to do a huge transaction in my Java application and doing single insert entries (volume in thousands) for user_account_entry table which has foreign key reference to user table.
When t...
Peonage asked 13/2, 2019 at 14:31
3
Solved
When SQL Server Books online says that
"Shared (S) locks on a resource are released as soon as the read operation completes, unless the transaction isolation level is set to repeatable read or...
Spindlelegs asked 2/6, 2009 at 21:7
1
Solved
I have the following statement in my PostgreSQL 10.5 database, which I execute in a repeatable read transaction:
delete from task
where task.task_id = (
select task.task_id
from task
order by ...
Gerfalcon asked 13/11, 2018 at 19:58
2
Solved
How do I set the isolation level of a transaction to 'SERIALIZABLE' in PHP using mysqli? I have looked everywhere and I can't find any information on it.
Here is an explanation of the isolation le...
Prehension asked 13/11, 2009 at 20:28
1
Solved
Sometimes it's desirable to use a higher isolation level than the default "read committed" for database operations in Django. The docs warn that:
Under higher isolation levels, your application ...
Isolating asked 21/9, 2018 at 0:16
1
Solved
Wiki says；
Repeatable read:
In this isolation level, a lock-based
concurrency control DBMS implementation keeps read and write locks
(acquired on selected data) until the end of the transact...
Syzygy asked 24/1, 2018 at 8:12
4
Solved
I am trying to understand isolation/locks in SQL Server.
I have following scenario in READ COMMITTED isolation level(Default)
We have a table.
create table Transactions(Tid int,amt int)
with so...
Erdrich asked 4/7, 2012 at 11:27
2
Solved
In Microsoft SQL Server, I use the READ_COMMITTED_SNAPSHOT ISOLATION
ALTER DATABASE MyDatabase
SET ALLOW_SNAPSHOT_ISOLATION ON
ALTER DATABASE MyDatabase
SET READ_COMMITTED_SNAPSHOT ON
In Sessi...
Sennet asked 29/1, 2014 at 2:58
2
Solved
I am reading through section 13.2 of the PostgreSQL Manual, but the textual descriptions found there are not enough clear, and lack examples.
For instance the following two paragraphs are not clea...
Donation asked 6/6, 2018 at 16:36
2
Solved
I'm trying to set transaction isolation level in Dapper using SqlBuilder, but didn't seem to work.
var builder = new SqlBuilder();
var sqlStatement = builder.AddTemplate(@"
SET TRANSACTION ISOLAT...
Terchie asked 8/5, 2018 at 17:33
2
Solved
I am trying to update table, which controlls application (application performs some select statements). I would like to update the table in transaction with isolation level set to read uncommited, ...
Platter asked 15/12, 2017 at 9:35
5
Solved
We are just starting to migrate/reimplement an ERP system to Java with Hibernate, targeting a concurrent user count of 50-100 users using the system. We use MS SQL Server as database server, which ...
Nibelung asked 12/12, 2008 at 21:54
5
Solved
The following method is supposed to peroform a dirty read on an open connection. There are no transactions. Where do I set IsolationLevel?
public string DoDirtyRead(string storedProcName, SqlConne...
Conversable asked 3/12, 2010 at 1:4
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