Entity-Attribute-Value (EAV): The Antipattern to Great to Give Up
Download the presentation: entity-attribute-value-eav-the-antipattern-too-great-to-give-up-andy-novick
The Entity-Attribute-Value (EAV) is a design pattern for relational databases that uses an extreme form of normalization to achieve flexibility and the ability to efficiently store temporal data that changes frequently. EAV has its critics and the flexibility it provides creates opportunities for abuse and introduction of bugs leading some to call it an Antipattern.
In many applications the advantages outweigh the disadvantages and EAV has been in use for 50 years in a variety of applications such as Medical Research, Financial Services and e-Commerce. This presentation will discuss:
- What is Entity-Attribute-Value and show variations including temporal variations
- What are the problems with EAV
- How to handle the problems and reduce the chance of introducing bugs
- Efficiently storing EAV data through partitioning and compression
- ETL on frequently changing EAV data
- Pivoting EAV data for efficient queries
When handled correctly EAV provides the flexibility needed by many applications.
buy indian accutane rating
4-5 stars based on
We respondto pain, danger, temperature, and touch as well, and we have memory, asso-ciation, and discrimination. Moll UM, Petrenko O (2003) The MDM2-p53 interaction.
Many Americans may similarly see theprocess of providing care as in some ways more important than cure (Stonington2013). The Procedural Manual and Guide for a Standardized Application of the ICF. Unlike with MM2-cortical,sCJD VV1 patients do not have large confl uent vacuoles,but there is faint synaptic PrPSc staining (Parchi et al.,1999)
Unlike with MM2-cortical,sCJD VV1 patients do not have large confl uent vacuoles,but there is faint synaptic PrPSc staining (Parchi et al.,1999). Closed-containment equip-ment should be used whenever feasible and when not,appropriate precautions are employed to prevent contami-nation. Therefore, parent interviewing is not performed.However, the nurse needs to get a complete history of themother before and during pregnancy
Therefore, parent interviewing is not performed.However, the nurse needs to get a complete history of themother before and during pregnancy. In the center,there isatrabecula containing atrabecular veinthrough which blood leavesthe organ. Anendarterectomy is an excision within an arteryof a thickened interior buy indian accutane usually named for theartery that is being “cleaned out.” More veinwork includes phlebotomy, an incision into avein to remove or give blood. Make sure you lay out all thetubes buy indian accutane gauze pads, and alcohol wipes within easy reach.
 examined riskfactors for delayed-onset infection, which included patients with infections greater than6months from the primary surgery. Neutrophil function and pyogenic infections inbone marrow transplant recipients
Neutrophil function and pyogenic infections inbone marrow transplant recipients.
He smokes about 30 sticks a day for last 10 years but nonalcoholic. What are the differential diagnoses? 489A
What are the differential diagnoses? 489A. In Figure 1.2a buy indian accutane if the death rates are simplycompared between smokers and non-smokers, they appear to be higheramong smokers (15 vs. Anarteriosclerotic stenotic plaque at the origin of the subclavian allows enoughblood supply to reach the arm for normal activity but not enough to meet theincreased demands of an exercised arm buy indian accutane resulting in blood being “stolen”from the vertebral artery.When the arm is raised, increasing oxygen demand,the vessels in the arm dilate to increase perfusion. The dental endoscope can be usedto visualize the subgingival area to see if the cause is apparent. Ifthe pelvic disease is considered treatable with (L)EER by applying the criteria outlinedabove buy indian accutane positron emission tomography/computed tomography (CT) is ordered to screen fordistant metastases.
A concentrated solution was made: onepart of the solution was diluted with 100 parts water to make a 1C dilu-tion. At rest(relaxation), the end-expiratory lung volume (EEV) of theadult (top left) is termed the functional residual capacity(FRC). Thispartnership is possible thanks to the empowerment of patients, which is the processof increasing the capacity of individuals or groups to make informed choices and totransform those choices into desired actions and outcomes [ 4 ]. For instance, if during a tumorresection, the image guidance system fails and troubleshooting leads to a 5 mindelay, such an error does not necessitate disclosure because the error did not causeany foreseeable harm to the patient
For instance, if during a tumorresection, the image guidance system fails and troubleshooting leads to a 5 mindelay, such an error does not necessitate disclosure because the error did not causeany foreseeable harm to the patient. Pathways of metastatic spread to the small bowel includedirect extension, intraperitoneal spread, and hematoge-nous and lymphatic spread. Symptomsthat interfere with normal or adaptive function, regardless of perceivedthreat level, should be given priority. Quality of life after radical cystectomy andorthotopic bladder substitution: A comparison between italian and swedish men.