____ provides information such as the time and date of a visit, the visitor's ISP, and the visitor's pathway through the site.
A. A user profile
B. Market research
C. A usage log
D. User registration data
Answer: C
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Phase 1 of the Extended Two-Phase Commit Protocol is identical to Phase 1 of the two-phase commit protocol we have described. Phase 2 of the extended protocol is as follows:
Phase Two. If the coordinator received at least one “aborting” vote during Phase 1, it decides to abort, deallocates the transaction record from its volatile memory, sends an abort message to all cohorts that voted “ready,” and terminates the protocol. If all votes are “ready,” the coordinator enters its uncertain period, forces a willing to commit record (which contains a copy of the transaction record) to its log, and sends a commit message to each cohort. Note that the transaction is not yet committed. If a cohort receives an abort message, it decides to abort, rolls back any changes it made to the database, appends an abort record to its log, releases all locks, and terminates. If a cohort receives a commit message, it decides to commit, forces a commit record to its log, releases all locks, sends a done message to the coordinator, and terminates the protocol. The coordinator waits until it receives the first done message from a cohort. Then it decides to commit, forces a commit record to its log, and waits until it receives a done message from all cohorts. Then it writes a completion record to its log, deletes the transaction record from its volatile memory, and terminates. Describe timeout and restart procedures for this protocol. Showthat this protocol blocks only when the coordinator and at least one cohort crash (or a partition occurs) or when all cohorts crash. Give an example where the transaction aborts even though all cohorts voted “ready.” What will be an ideal response?
Installing a device driver can sometimes cause system instability
Indicate whether the statement is true or false
Given a folder with images in it, create an index HTML page with links to each image. Write a function that takes a string which is the path to a directory. You will create a page in the folder named index.html that should be an HTML page containing a link to every JPEG file in the directory. You will also generate a thumbnail (half the size) copy of each image. Use makeEmptyPicture to create a blank picture of the right size, then scale down the original picture into the blank picture. Name the new image “half-” + the original filename (e.g., if the original filename was fred.jpg, save the half-size image as half-fred.jpg). The anchor in the link to each full-size picture should be the half-size image.
What will be an ideal response?
In the accompanying figure, Item 4 points to the Timing Group, which you can use to adjust when an animation's ____ plays.
A. effect B. icon C. theme D. button