Database Connection Pooling is a great technique used by lot of application servers to optimize the performance. Database Connection creation is a costly task thus it impacts the performance of application. Hence lot of application server creates a database connection pool which are pre initiated db connections that can be leverage to increase performance.Apache Tomcat ...
Although I work mainly in Java/J2EE, recently I had a requirement in Oracle to take temporary backup of a table and compare the data of original table with this backup table. So I had to copy the data from table A to a temp table TA.First I tried creating temp table normally and copied the ...
Ever thought why would one need to fetch random rows from a database table? You may want to display some random information (like articles/pages/links) to your user. I had a requirement wherein I had to fetch 10 random rows from MySQL database and display it on screen. I used following simple query for retrieving random records ...
Have you ever thought how does the search functionality is implemented in all the websites! Most of the internet blogs and websites are powered by MySQL database. MySQL provides a wonderful way (Full-text Search) of implementing a little search engine in your website. All you have to do is to have MySQL 4.x and above. MySQL ...
The basic idea this time is to present a way to form a tag cloud from user input text and text entered in the past. A tag cloud is a visual depiction of user-generated tags, or simply the word content of a site, used typically to describe the content of web sites.for this we will create an HTML form that will accept user text & also ...
Let us talk about Maria.. no no not Maria Sharapova, its new version of MyISAM engine for MySQL which is claimed to be crash safe and provides more concurrency. It aims at becoming fully transactional (ACID). Following are the features of Maria. Featuresul.myPost li{text-decoration:none;border:none;list-style-type:disc;margin-left:10px;}ACID (Atomicity, Consistency, Isolation, Durability) Commit/Rollback Concurrent selects (via MVCC) Row locking Group commitAlthough Maria itselft is ...
Since its release in 1995, MySQL has became one of the most commonly used database in Internet world. A lot of small and medium businesses uses MySQL as their backend db. Its popularity for use with web applications is closely tied to the popularity of PHP, which is often combined with MySQL. Wikipedia runs on ...
Resetting the root password of a MySQL database is trivial if you know the current password if you don't it is a little trickier. Thankfully it isn't too difficult to fix, and here we'll show one possible way of doing so.If you've got access to the root account already, because you know the password, you can change it easily:gaurav@gaurav:~$ mysql --user=root --pass mysql Enter password:mysql> update ...
Problem with comparison of float or double column in MySQL I had a problem in comparing the number with decimal point with a float column in MySql. After some investigation I came to know that, in most of the computer architecture, the value of floating point numbers is stored as approximation. So if you compare the 21.40 with the given column, it actually compare the value ...
Lot of time we have requirement to update two tables simultaneously. Say for example, we have two tables CUSTOMER_DETAILS and CUSTOMER_ADDRESS. While adding a row in CUSTOMER_DETAILS, few details like address is first written in CUSTOMER_ADDRESS and its reference is added in CUSTOMER_DETAILS table. Now if ADD_ID is a primary key in CUSTOMER_ADDRESS table and if it is an auto increment field than how to ...
