Why is it important to document change requests? What happens if a development team doesn’t? * Database administrators usually support different business units with each unit having their own set of unique procedural requirements. Formalizing and documenting the change request process minimizes the potential for miscommunication between the business units, application development areas and the database administration unit. This is even more important to remote database services providers, meaning that if an organization doesn’t have a formal change request process in place, they’d have to create their own.
If they are not balanced, how can they be fixed? No they are not balanced because they do not have the same number of inputs. In order to balance the diagrams, the context diagram will need to depict the additional sources and their inputs into the system. 5. Why is it important for the team to create DFDs if they are not going to write the actual system code themselves?
Kernel will only interact with process not threads. Process Control Information: Thread control block should handle scheduling and State Information. Data Structuring should also be handled by thread control block (mostly). Memory Management and Resource ownership should belong to process control block.
Redundancy wastes space because you’re storing the same data in multiple places. The extra space results in larger spreadsheets that require more space in memory and on disk and that take longer to save and open. 2. Besides redundancy, what other problems are associated with the nondatabase approach to processing data? The problems, other than redundancy, associated with the nondatabase approach to processing data include difficulties accessing related data, limited security features to protect data from access by unauthorized users, limited ability for multiple users to update the same data at the same time, and size limitations.
Memory references must be deciphered in the code to real physical memory address. Security Methodologies ought not to have the capacity to reference memory areas in an alternate methodology without consent.
When it comes to making hardware or software purchase decisions there are two different types of criteria one could go by; objective criteria or subjective criteria. Objective criteria evaluations are based purely on verifiable facts; no biased opinions or previous experience. An objective statement could be that a particular piece of software will only work on a specific operating system or only one particular form factor for a hard drive will work on a specific mother board. Subjective criteria are a statement based on the speakers view or perspective. Subjective criteria cannot be proven by concrete facts.
The multi-store model (MSM) of memory consists of three sections; SM (sensory memory), STM (short term memory), and LTM (long term memory). Information of the surroundings of an individual is moved from SM to STM when the information concerned is given attention. When information is in the STM maintenance rehearsal is required in order for the information to stay in the STM. If elaborative rehearsal is used on the information that is in the STM it is then transferred into the LTM, this is needed to remain in the memory without maintenance rehearsal and as a result of this the information is less likely to disappear from the memory. Research that was carried out by Sperling in 1960 gives evidence for the MSM, this is because the experiment that was carried out showed that when reporting a group of 12 items that were flashed on a screen for 50 milliseconds, it was 42% less accurate than reporting only one row, which was 75%.
Define second normal form. What types of problems would you find in tables that are not in second normal form? A table is in second normal form if it is in first form and no non-key column is dependent on only a portion of the primary key. If a table isn’t in second normal form, redundant data will cause wasted space and update problems. A major problem can occur with inconsistent data.
Outline the multi-store model and working memory model The multi-store model of memory is when information appears in Sensory Memory if attention is given to this it transfers to Short Term Memory, if the information is then rehearsed; it appears in the Long Term Memory. If at any time attention or rehearsal is not given to the information the trace decays and so because of this, we forget, however this need for rehearsal for transference into the Long Term Memory has been criticised as some information can be retained without any form of rehearsal. Within the multi-store model of memory, both Long Term Memory and Short Term Memory differ from each other in various ways; the duration of short term memory is 18 seconds, where as the duration of long term memory is a lifetime. The capacity of short term memory is found to be 7 + OR – 2, compared to long term memory’s unlimited capacity. As far as coding is concerned, there are also differences between short term and long term memory; short term is acoustic and long term is semantic.
earsal is the process of repeatedly verbalizing, thinking about, or otherwise acting on information in order to keep that information in memory. Maintenance rehearsal is the repetitive review of information with little or no interpretation. Elaborative rehearsal involves repetition in which the stimulus may be associated with other events and be further processed. Elaborative rehearsal exists in the encoding of information within long term memory. Maintenance rehearsal alone is not sufficient for information to be transferred into long-term memory and permanently stored.