Article edit: Summary, 1/8

Hi Experts,

Could you please help me with the edit of the following section only:

1. "Summary" upto "Manual Transaction:"

at: http://www.experts-exchange.com/articles/20279/Isolation-levels-at-a-glance.html

Upcoming questions below are only FYI. They are not a part of this question.
1. "Summary" upto "Manual Transaction:"
2. "Manual Transaction:" upto "Programmatic Transaction:"
3. "Programmatic Transaction:" upto "Data Anomalies and Isolation Types:"
4. "Data Anomalies and Isolation Types:" upto "Data Anomaly 1 of 4: Dirty Read"
5. "Data Anomaly 1 of 4: Dirty Read" upto "Data Anomaly 2 of 4: Lost Update"
6. "Data Anomaly 2 of 4: Lost Update" upto "Data Anomaly 3 of 4: Nonrepeatable Read"
7. "Data Anomaly 3 of 4: Nonrepeatable Read" upto "Data Anomaly 4 of 4: Phantom Read"
8. will be added later.
LVL 34
Mike EghtebasDatabase and Application DeveloperAsked:
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Leslie BloomCorporate & Product Marketing ManagerCommented:
Here are some suggested edits:

Typically a database has multiple concurrent users making data requests or edits. These activities, without isolation, often interfere with each other. This results in users being locked out or even bad data. This is where isolations are helpful to be used with transactions, they help to control user lock outs and unexpected data anomalies.

Where does isolation fit in T-SQL?
[Figure 1]
Figure 1: Isolation is a property in transaction.
 
First it’s important to understand what a transaction is.  By definition, a transaction is block of code. Below [figure 2] we show it performing a task in a logical order against a database, manually or programmatically.

A transaction must exhibit ACID properties (atomicity, consistency, isolation, and durability). Although, technically, it’s possible to perform a transaction manually, it is incredibly cumbersome.

The following demo of a manual transaction gives us a clear sense of how a data anomaly is possible in a transaction. Because this is a manual transaction, the user mentally maintains the ACID properties as required. The focus of this article is on isolations; for more information on transactions click here.

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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Hi Leslie,

I really appreciate for the comments. One thing I should have mentioned in my original post is that the summary section is limited to 300 characters with space. Your good edit has 342 characters. Is it possible to make it work with 300 characters?

Thank you,

Mike
Leslie BloomCorporate & Product Marketing ManagerCommented:
This should meet the character limit:
Typically a database has multiple concurrent users making data requests or edits. These activities, without isolation, often interfere with each other. This is where isolations are helpful to be used with transactions, they help to reduce user lock outs and unexpected data anomalies.
Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Thank you.
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