2023-09-04
387 reads
2023-09-04
387 reads
Learn a bit about concurrency problems in SQL Server, the issues they create, and the different isolation levels that help you solve them.
2020-05-12
35,274 reads
2020-02-18
1,096 reads
2019-10-28
6,765 reads
Both Serializable and Snapshot isolation levels exclude concurrency issues such as Dirty Reads, Non-repeatable Reads and Phantoms. However the way in which they deal with such issues is quite different. In this article, Sergey Gigoyan explains the main differences between the two.
2016-01-13
3,453 reads
2014-08-14
1,916 reads
An examination into how the various transaction isolation levels affect locking (and blocking)
2014-02-13
8,869 reads
This article looks at SQL Server locking and transaction isolation levels, how to set the transaction isolation level, and how some isolation levels use locking, while others use row versioning. It also explains what type of locks data update requires.
2013-07-17
3,573 reads
Transaction Isolation levels are described in terms of which concurrency side-effects, such as dirty reads or phantom reads, are allowed.
2013-05-01
9,817 reads
2012-11-21
2,092 reads
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Let’s consider the following script that can be executed without any error on both SQL Sever and PostgreSQL. We define the table t1 in which we insert three records:
create table t1 (id int primary key, city varchar(50)); insert into t1 values (1, 'Rome'), (2, 'New York'), (3, NULL);If we execute the following query, how will the records be sorted in both environments?
select city from t1 order by city;See possible answers