MPs back 'squalid' curbs on FoI
MPs today backed a controversial bid to exempt themselves from the Freedom of Information Act - a move described by opponents as "squalid". The Tory private member's freedom of information (amendment) bill secured its third reading by 96 votes to 25, a majority of 71. (Read on Source)
Is my understanding regarding transactions correct ?
I'm struggling to understand how transactions, redo and rollback all fit together.
My understanding of the process is as follows:
I issue an insert/update/delete, basically some DML. This grabs a slot in the transaction table slot in a rollback segment header which is initially flagged as ACTIVE (i.e. uncommitted) so the undo shouldn't be overwritten.
The "before" image of the blocks that are changed by the DML statement are written into blocks in the rollback segment.
Because these constitute changes to the rollback segment blocks these change vectors are written to the redo log buffer.
An ITL entry is created in the headers of the data blocks that are changed by the DML. This ITL contains a pointer to the transaction table slot in the rollback segment.
These changes to the data blocks are written to the redo log buffer.
Let's now say the user has not yet committed these changes, and LGWR now writes the redo log buffer contents to the online redo log files.
At this point I think I am OK. If the instance crashed then, on recovery SMON would firstly reconstruct the undo from the change vectors to the rollback block and reconstruct the changes to the data blocks but would then rollback the changes because the transaction table slot in the rollback segment header shows that this transaction is not comitted.
Is this correct?
OK moving on - what exactly happens when the user issues a COMMIT? The 9i concepts states that it writes the SCN to online redo log files? How exactly is this achieved - is it just a "line" in the redo log file and not a change vector?
My guess is that this is what happens:
When the user issues a commit, the transaction table slot in the rollback segment is changed from ACTIVE (uncommitted) to INACTIVE (committed). This constitutes a change to the block containing the rollback segment header. And this change is written away to the redo log buffers.
So when rolling forward using the online redo log files, for this transaction we have:
1) rollback segment header(uncommitted)
2) change vectors to reconstruct "before image" undo blocks
3) change vectors to change data blocks
3) rollback segment header(committed)
I'm sure this is an over simplified (and probably wrong) version. Can someone please clarify this for me?
My other major area of confusion in all of this is where do SCN's fit in, when are they allocated?
Empowering publishers with a new Help Center
How do you keep thousands of Google News publishers informed about getting their content included in Google News? In September 2006 we launched our first version of a Help Center for Publishers. Since then, Google webmaster tools expanded their offerings to enable news publishers who are already included in Google News to submit a News Sitemap. ... (Read on Source)
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Working from a Beijing surveillance center, two officers will try to eliminate China's access to porn and other "unhealthy" content.
It's time to retire the mom test
One of the more humorous ad series today is the Geico "caveman" commercials, featuring a caveman complaining about the stereotype of something being "so easy a caveman could do it." Since we don't have to worry about offending cavemen (or cavewomen), companies can safely poke humor at that demographic group and not worry about alienating anyone. However, you might want to think twice about saying "it's so easy your mom can do it."
Make Money without a Website - Yes it can be done Posted By : Katherine Quirke
You don't need a website to make money using the internet. You don't need to be a web based business to make money using the internet. It is surprisingly simple to promote your business online and not have a website.
Web Host, Cbeyond VoIP Provider, Accelerates BeyondVoice SIPconnect Service
Atlanta, Georgia - (The Hosting News) - September 19, 2007 - Web hosting and managed integrated VoIP services provider, Cbeyond's BeyondVoice with SIPconnect Service, with SIP trunking to scale, has been engaged by Houston-based small businesses, to enhance growth, while reducing expenses.
BeyondVoice with SIPconnect is an integrated package of voice, mobile and broadband Internet services that leverages the SIPconnect specification to ensure a consistent quality of service, low cost and full-featured telephony for SIP-based VoIP calls. Cbeyond developed the SIPconnect specification with other industry leaders to connect its private, managed VoIP network to next-generation IP-PBXs.
Bill Lawrence opened his first Bubbles Car Wash (Bubbles) in Houston in 1991. Within six years, Mr. Lawrence grew his business to 12 locations across Houston and plans to add 12 more locations in the next four years. Each premium car wash location uses sophisticated technology to provide customers with a unique experience. Customers can schedule an appointment online, and can use complimentary phone, fax, and high-speed Internet services, while the team at Bubbles works on their vehicle.
Mr. Lawrence decided to consolidate his services with a single provider in May 2005. With limited IT resources, efficient and easy-to-use technology was a requirement for Bubbles. After consulting with Cbeyond, Lawrence selected the company's BeyondVoice with SIPconnect service for each location.
According to Mr. Lawrence, Cbeyond's technical support and customer care eliminated the administrative overhead and hassle associated with dealing with multiple vendors. Switching to Cbeyond also reduced voice and data expenses by 25 percent.
Mr. Lawrence explained, ''Our service at Cbeyond is predictable and reliable. Our excellent working relationship allows us to take advantage of Cbeyond's knowledge and expertise to ensure we are utilizing their services and applications in the best manner possible for our business.''
With more than 20 productivity-enhancing applications to choose from, Bubbles has also been able to add Cbeyond applications to its service package as needed. As business grew, managing incoming faxes became a challenge. Bubbles added Cbeyond's fax-to-email application to its service package and immediately eliminated the administrative overhead of distributing paper faxes companywide. Fax-to-email allows each store manager to have a dedicated fax number. Once faxes are received they are converted to electronic files and directed to the appropriate employee's email inbox.
Brook Robinson, Chief Marketing Officer for Cbeyond remarked, ''Our mission is to provide big business communications tools to small businesses at prices they can afford and that we can deliver profitably. Our IP-based services help customers like Bubbles to take advantage of rich, personalized features that enable them to deliver a unique customer experience, scale for growth and cut costs.''
Mr. Lawrence added, ''As we continue to expand we can accurately budget for our communications and IT needs, and leverage Cbeyond as our trusted provider. Cbeyond has exceeded our expectations; from the relationships to the rock-solid platform.''
Cbeyond, Inc. is an IP-based managed services provider that delivers integrated packages of communications and IT services to more than 29,000 small businesses in Atlanta, Chicago, Dallas, Denver, Detroit, Houston, Los Angeles and San Diego. Cbeyond offers more than 20 applications including local and long-distance voice, broadband Internet, mobile, BlackBerry, broadband laptop access, voicemail, email, web hosting, fax-to-email, data backup, file-sharing and virtual private networking. Cbeyond manages the services over a private, 100-percent Voice over Internet Protocol (VoIP) facilities-based network.
For more information about Cbeyond, please visit: www.cbeyond.net.
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Acupuncture Reduces Side Effects Of Breast Cancer Treatment As Much As Conventional Drug Therapy, St
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Stock Market Review
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If only we could all be as tough and patriotic as Bing West
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name: MAGPIE