Skip to main content

Posts

Showing posts from November, 2008

Email Alerts are not received...

In one of application, Email alerts are sent using SQL sp_send_dbmail stored procedure. Email alerts were working properly, but suddenly noticed email alerts are not received.

To troubleshoot the issue, first I checked the msdb.dbo.sysmail_event_log table using the below query.

SELECT log_id, event_type, log_date, description, process_id, mailitem_id, account_id, last_mod_date, last_mod_user
FROM
msdb.dbo.sysmail_event_log 
ORDER BY
log_date DESC

If there is any error, you should see records with the event_type value as error.
In my case there are records with event_type value as error, and the description value for those records is same as below

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 3 (2018-02-01T10:41:27). Exception Message: Cannot send mails to mail server. (The SMTP server requires a secure connection or the client was not authenticated. The server response was: Authentication required).  )

As per the error descript…

Stemming

Stemming process plays a major role in Indexing applications. In most cases more than one word have similar semantic interpretations and can be considered as equivalent for the purpose of Information Retrieval applications .Due to that Stemmers have been developed reduce a word to it’s root form. Stemming is the process for reducing inflected (or sometimes derived) words to their stem, base or root form – generally a written word form. The process of stemming, often called conflation, is useful in search engines for indexing and other natural language processing problems. For example a stemmer for English should identify the string "cats" (and possibly "catlike", "catty" etc.) as based on the root "cat", and "stemmer", "stemming", "stemmed" as based on "stem". A stemming algorithm reduces the words "fishing", "fished", "fish", and "fisher" to the root word, "fi…

Lucene for Indexing Applications

Lucene is a opensource information retrieval library. It is originally designed in Java, but has been ported to programming languages including Delphi, Perl, C++, Python, Ruby, PHP and C#.It can be used for any application which requires full text indexing and searching capability.The key classes that we will use to build a search engine.Document - The Document class represents a document in Lucene. We index Document objects and get Document objects back when we do a search. Field - The Field class represents a section of a Document. The Field object will contain a name for the section and the actual data. Analyzer - The Analyzer class is an abstract class that used to provide an interface that will take a Document and turn it into tokens that can be indexed. There are several useful implementations of this class but the most commonly used is the StandardAnalyzer class. IndexWriter - The IndexWriter class is used to create and maintain indexes. IndexSearcher - The IndexSearcher cl…