A fan trap is a less common problem than chasm traps but has the same effect of returning more data than expected. Nbranch in this model it may be impossible to determine the branch a staff belongs to, in the situation when staff belong to division having more than 1 branches. It does take a structural understanding of the data and more importantly how the user community will consume the data to provide objects to avoid these scenarios. Chasm trap the chasm trap occurs when two many to one joins converge on a single table. A fan trap is a less common problem than chasm traps in a relational database schema. Checked universes for integrity and exported them to the repository to make resources available to the users and groups. Resolved chasm, fan traps and loop problems using aliases and contexts in the universe and exported to repository. Fan trap occur in a situation when a model represents relationship between entity types however a path between certain entity occurrences is ambiguous.
Recognizing and resolving chasm and fan traps when. A chasm trap is simply one specific way that tables in a database schema can be related to one another. It also explain the traps with example and describes the resolution as well. A connection is a named set of parameters that defines how a business objects application accesses data in a database file and is defined in an universes via universe designer. Transitive relationships trapsa transitive relationship exists if there is more than one path between two tables custom 0n custom er type 1n er info. What do you mean by a fan trap and how would it be resolved. Two boy make bird trap using paiute deadfall trap and bamboo than for watching my videos. You save the universe information as an adobe pdf file. Chasm trap is a condition that arises when the values inside the fact table get in.
Daves adventures in business intelligence fan chasm trap. A boobytrap is usually a hostile piece of computer code that wipes out files or does damage to evidence. A chasm trap occurs when two manytoone joins converge on a single table. Nbranch in this model it may be impossible to determine the branch a staff belongs to, in the situation when staff belong to division. Business objects can be helpful as an olap tool to highlevel management as a significant part of decision support systems. Select the first link draw the diagram of the join as it is seen in the bo designer andsee if there is any fanchasm trap or not. A chasm trap occurs when a model suggests the existence of a relationship between entity types, but the pathway does not exist between certain entity occurrences. Chasm and fan traps should be avoided when building your elasticube schemas. This is the most effective way to solve the fan trap problem. Chasm trap is a condition that arises when the values inside the fact table get inflated at the time of measuring the values from two different fact tables by considering the dimensions inside the dimension table. And yet during this same period unemployment has grown from 420,000 people to 5. Use the trap presets dialog box for entering trap settings and saving a collection of settings as a trap preset. A chasm trap is a type of join path between three tables when two.
In situation like this, business objects generates mutple queries. Resolving chasm traps in sap bo tutorial 10 may 2020 learn. I have a fan trap using po header, po lines and po distributions which has been resolved using alias tables. When two many to one joins converge on a single table is called chasm trap and there should be many to one to many join relation between 3 three tables. If the question is does designer detect fan traps and chasms automatically the answer is no. Chasm trap is a condition that arises when the values inside the fact. Fan trap and chasm trap this is an example of fan trap and chasm trap and how to resolve these scenarios. A fan trap is a type of join path between three tables when a onetomany join links a table which is in turn linked by another onetomany join.
Sap business objects designer interview questions and answers. When there are dimension objects in one or both fact tables, use context. The image on this page were taken in the desktop version of sisense, however, the same principles described on this page also apply to the webbased elasticube manager chasm and fan traps should be avoided when building your elasticube schemas chasm traps. See the data access guide for complete information on creating, modifying, and optimizing connections. This list of interview questions includes the various types of connections, custom hierarchies, schemas supported by business objects designer, data sources and more. As a result multiple rows are returned from the tables when processing the query. It has the same effect of returning more data than expected. A fan trap is many many relationship 3 or more then three tables are involved. In short, a chasm trap can be imagined as a bottomless pit where some rows may unknowingly fall in and never come back out. It can cause numbers to multiply it gives inflated results when u pull data from these tables. This creates two sql statements and two separate tables in business objects, avoiding the creation of a cartesian product. Its not at all unusual for entire deleted files to be recovered. The query information is passed to other system using cwxml common warehouse xml files this makes query data interoperable to desperate systems requiring various different software landscape.
Designer is one of my favorite parts of the business objects product suite. Like the below example, general ledger gl is joined with gl balance fact and loan balance fact tables in many ends. So when viewing a report caught in a chasm trap, one may ask hey where did record x go. Adobe pdf format, several universes, some microsoft access database files. While designig a universe, i am sure you must have encountered join path problems and various traps like chasm traps, fan trap to solve this we have to use alias or contexts and separate query for measures. This type of join convergence is called a chasm trap.
Resolving fan traps in sap bo tutorial 24 april 2020. Aug 27, 2014 while designing sap businessobjects universe with universe design tool, chasm trap is one of the major join problems that one can come across. In france over the past twenty years gnp has grown by 80 per cent, 6 a spectacular performance. Hi, difference between loop and trap in business objects. Since bo is creating multiple queries for header and distribution data, the condition on distribution will not be applied to the header query. What is the chasm and fan traps in business objects. Therefore, please read below to decide for yourself whether the trap. A trap preset is a collection of trap settings you can apply to pages in a pdf. Chasm trap should be solved by making use of two di. There is a readme file that contains notes on how to get everything working. There is one pdf document provided by bo, on the traps at this link trap document.
In bi system fan trap and chasm trap are common problem when designing a universe semantic layer which is used by bi reports to dynamically generate query. Aug 31, 2014 in bi system fan trap and chasm trap are common problem when designing a universe semantic layer which is used by bi reports to dynamically generate query. The query information is passed to other system using cwxml common warehouse xml files this makes query data interoperable to desperate systems requiring various different software. The fan trap is resolved by restructuring the original er model to represent the correct association. Identify and gather requirements for new solutions or enhancements. Exported the business objects reports to the repository so that the end users can view the reports through web i. For example when you run a query that asks for the total orders by each order line, for a particular. Recognizing and resolving chasm and fan traps when designing. This retrieved information can be presented and analyzed within a document that of business objects. To take a step back, in a denormalized data model, you have fact and dimension tables. According to research business objects has a market share of about 5. A chasm trap occurs when two manytoone joins converge on a single table, and the query includes.
We are in chasm trap when a table joins with two others in onetomany relationship. Unlike loops, which return fewer rows, the chasm and. Migrating documents from business objects reporter to web intelligence xi r2. The problem i am having is applying conditions at the po distribution level. Top business objects interview questions and answers for 2020. Chasm trap should be solved by making use of two different methods. A one to many join links a table which is in turn linked by a one to many join. Loop is a continues path between the tables trap also is a kind of loop due to oracle limitation some time it give multiple duplicate values when 3 tables join continuously with 1n and 1n and cartesian. There are many advantages in making use of business objects, and. Chasm trap and fan traps are the loops which will occur while ditecting loops. Resolving fan traps in sap bo tutorial 24 april 2020 learn. This type of fanning out of one to many joins is called a fan trap.
Creating an alias and applying aggregate awareness function. Executable files may, in some cases, harm your computer. The following brief explanation may help you in understanding the concept which is usually found to be dubious across the web. Work with the business to design and develop solutions to improve business processes. Recognizing and resolving chasm and fan traps when designing universes relational databases can return incorrect results due to limitations in the way that joins are performed in relational databases. Top business objects interview questions and answers here we have compiled the top sap business objects interview questions and answers to help you in your job interview. Like the below example, general ledger gl is joined with. Fan trap the fan trap occurs when a one to many join links a table which is in turn linked by another one to many join. Boobytrapped computers to protect data they think might later become evidence, culprits sometimes boobytrap their computer. For example a customer can place many ordersand or place many loans. If you dont apply a trap preset to a trapping page range, that page range will use the default trap preset, a collection of typical trap settings. Fact tables contain measurable business facts like sales or order records and references to dimension tables, which contain details about the entities. Universe file names as identifiers saving a universe definition as pdf.
It occurs where there is a relationship with partial participation, which forms part of the pathway between entities that are related. Sap business objects interview questions pdf, browse latest sap bo interview. In situation like this, business objects generates mutple queries and synchronizes the queries in a single cube. Many to one joins from two fact tables converge on a single lookup table. Participates in planning to organize and schedule upcoming work. Dec 04, 2019 top business objects interview questions and answers here we have compiled the top sap business objects interview questions and answers to help you in your job interview. You should set teh display as the arity in the tooloptions graphics. When there are measure objects defined for both fact tables, use the universe parameter option sql multiple sql statements for each measure. Select the first link draw the diagram of the join as it is seen in the bo designer andsee if there is any fan chasm trap or not.
Connection trapsa connection trap is an optional path through different entitiesthere must be reliable path through all truly related entities 1n 1n division branch 11 employee 11. In a universe, when you have 3 tables in structure and first table is joined with one to many relationship with second table which is connected with one to many relationship with third table and when you drag a measure from 2 nd table and dimension from 3 rd table, value of measure is inflated, this condition is called fan trap. A chasm trap occurs when two manytoone joins converge on a single table, and the query includes measures from both leaf tables. You can generate trap files on demand using the db2pd command with the stack all or dump option. Unlike loops, which return fewer rows, the chasm and the fan traps are two common. Business objects server and all business objects requests are then handled via the business objects server hence 3tier. In a universe, when you have 3 tables in structure and first table is joined with one to many relationship with second table which is connected with one to many relationship with third table and when you drag a measure from 2 nd table and dimension from 3 rd table, value.
This is a join path problem that is created in a universe. Fan trap occur in a situation when a model represents relationship between entity types however a path between certain entity occurrences is ambiguous example. If you dont apply a trap preset to a trapping page range, that page range will use the default trap preset, a. Since bo is creating multiple queries for header and distribution data, the condition. Scenario of a fan trap with two tables in a onetomany relationship. While designing sap businessobjects universe with universe design tool, chasm trap is one of the major join problems that one can come across.
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