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According to the U.S. Department of Education and the Manhattan Institute, every school day some 7,000 students drop out of school. Annually, that adds up to about 1.2 million students who will not graduate from high school with their peers as scheduled. The national high school graduation rate is just 69.9 percent.

Nationally, the graduation rate for white students was 78 percent, compared with 72 percent for Asian students, 55 percent for African-American students and 53 percent for Hispanic students. A recent study found that the D.C. graduation rate fell to 48.8 percent in 2006. Comparable numbers for Maryland show a graduation rate of 73.5 percent while Virginia’s sit at 69.2 percent.

Most alarming is the dichotomy between urban and suburban schools. The District is not alone. Seventeen of the nation’s 50 largest cities had high school graduation rates lower than 50 percent. In Baltimore, for example, researchers found that 34.6 percent of city school students graduate, compared to 81.5 percent of the public school students in Baltimore’s suburbs.

Consider the following:

  • Dropouts are 3.5 times more likely to be arrested than high school graduates and more than eight times as likely to be incarcerated.
  • Nationwide, 68 percent of state prison inmates do not have a high school diploma. There is data showing a 10 percent increase in graduation rates has historically reduced murder and assault rates by approximately 20 percent.
  • According to the U.S. Bureau of Labor Statistics, in February 2009 the national unemployment rate for those without a high school diploma was 4.3 percentage points higher than those who had graduated from high school.
  • The U.S. Department of Education reports that students from low-income families are six times more likely to drop out of high school than students from high-income families.
  • One study in 2001 found that women who gave birth during their teens completed secondary-level schooling 10 to 12 percent as often and pursued post-secondary education 14 to 29 percent as often as women who waited until age 30.
  • The national average annual income for a high school dropout in 2005 was $17,299, compared to $26,933 for a high school graduate, a difference of $9,634. Nationally, high school dropouts were also the only group of workers who saw income levels decline over the last 30 years.
  • Children of parents who graduate from high school are themselves far more likely to graduate from high school than are children of parents without a high school diploma.
  • High school dropouts are more likely to receive public assistance than graduates and are less likely to have health insurance and a pension or retirement program.
 

SAP and IMDB

An In-Memory DataBase (IMDB) is an RDBMS designed for real time performance in a high volume, event based, low latency transactional environment. Typical applications for are financial trading applications and telecom billing jobs which demand a service level agreement from the response time of database search and edits.

So, what is the difference between custom-built memory structures such as buffers and IMDB. For starters, IMDB offers API functionality to applications using ODBC and JDBC. This means, providing the power of SQL Query language to poll the data located entirely in memory without disk I/O.

As a result of high throughput and speedier access to data, applications like SAP can provide a real time response for time critical jobs.

SAP IMDB solutions using Sybase are popular due to an integrated solution framework. Key data base challenges like indexing, query management, storage, hashing, replication, transaction logging, savepoints and restores have been incorporated into SAP IMDB scenarios.

Limitations of SAP IMDB

Despite the commoditization of hardware and low-cost of available memory today, one cannot overlook the limitations posed in an IMDB based solution.
  1. IMDB solutions are OS aware, meaning there is a tight coupling with the underlying operating system. Unix / Linux platforms are popularly used for their support of IMDB solutions.
  2. IMDB solutions are restricted by the shared memory in which they reside. This means applications can run as long as they fit within pre-defined criteria. This means scalability is an issue for IMDB solutions.
  3. IMDB solutions tend to introduce low latency in the applications. This is the price to pay for expecting rapid response to event based transactions.

Summary

SAP IMDB solutions have their pros and cons. Architecting a solution would involve taking a holistic approach to the overall needs.

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