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Abinitio Partitions
What is the difference between partition, re-partition and departition?
sixto.dsilva
- Apr 15th, 2008
Partition is coverting a serial file(mfs) into multiple flows --> component used is partition by key or partition by round robin.departition is opposite of partition , sometime after the parallel processing , you want output to be serialized we using gather and merge component for this.
rcoon7
- Mar 10th, 2008
Dividing a single flow of records(data) into multiple flows is known as partitioning.Dividing a x-way flows of records(data) into y-way flows is known as re-partitioning.e.g: 2 ways flow ino 4 ways flowCombining multiple flows into a single flow of records(data) is known as departitioning.
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Standard Environment
What is Standarad Environment? What it contains?
sixto.dsilva
- Apr 17th, 2008
standard environment is the ab initio environment that has more then one private project and also other public project , in addition to the required environment project.Private project is one which no...
surabhiraghu
- Jan 2nd, 2008
std env is nothing but collection of public & private & environment project.
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Explain about deadlock in Abinitio
sixto.dsilva
- Apr 17th, 2008
As explained in above answer that when two or more processes are requesting for one singel resource , that time deadlock can occur.in Ab initio deadlock is avoided by using phasing and also by using the resource pool.
varma
- Nov 22nd, 2007
When 2 or more processors are requested for the one single processor, that time deadlock situvation is occured.
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Give examples for pipeline, component and data parallesim?
sixto.dsilva
- Apr 18th, 2008
pipeline Parallelism occurs when the several connected progrm components on the same branch of graph executes simultanteously. if you are using a sort component the pipeline parallelism does not occur...
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Explain about Multi update in Abinitio and specific business reason for it's use.
sixto.dsilva
- Apr 18th, 2008
multi update executes SQL statmts against incoing records to modify one or more tables in a database.It treatss each input record as a completely separate piece of work.
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What is a ramp limit?
sixto.dsilva
- Apr 21st, 2008
Limit parameter contain an interger that represents a number of reject eventsthe ramp parameter contains a real number that represents a rate of reject events in the number of records processed.
sangee
- Nov 29th, 2006
We will go for ramp limit to set the reject threshold for the record being processed.
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What is the Difference between DML Expression and XFR Expression ?
sixto.dsilva
- Apr 21st, 2008
DML are record format files used by the metadata files in Ab inition. DML can be embedded in the graph or can be a separate file with .dml extension.xfr file are transform functions used by graph.These are present in sandbox.xfr file can used to manipulate data nad compute new data from it.
K Nagi Reddy
- May 4th, 2006
DML describes the record format of the data. It is metadata.XFR is the set of business rules called a transform function.
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What is the DBCC command used for?
babuKishore
- Dec 1st, 2006
These statements check the physical and logical consistency of a database. Many DBCC statements can fix detected problems.
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What is data skew? how can you eliminate data skew while i am using partitiion by key?
hsevna
- May 15th, 2008
The skew of a data or flow partition is the amount by which its size deviates from the average partition size, expressed as a percentage of the largest partition:Skew of data =(partition size - avg.partition size)*100/(size of largest partition)
dontbuckme
- Sep 22nd, 2006
data not evenly partitioned. PBE uses hash function. choose the key that has the most distinct values might improve the data being distributed evenly.
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What are the most commonly used components in a Abinition graph?can anybody give me a practical example of a trasformation of data, say customer data in a credit card company into meaningful output based on business rules?ThanksSri
mukund
- Dec 7th, 2006
Hi gayathri, We cannot say strightly that only certain componets only we have to use,it depends on business requirement,functionality. most frequently we use FBE,REFORMAT,ROLLUP,LOOKUP(LOOKUP_LO...
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What is the difference between sandbox and EME, can we perform checkin and checkout through sandbox/ Can anybody explain checkin and checkout?thanks advsatish kumar
lakshmipavany.g
- Jun 25th, 2008
Hi EME is like All-In one guide, where as Sand box is an idividual subjected guide restricted for individual user.Check in/ check out are the procedure to send/extract graphs from sandbox to EME....
sivakrishna
- Jul 6th, 2006
The project is under source control under EME. You can't do any manipulations on the project which is in EME. So if you want to do any manipulations you have to check out the project into your sandbo...
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How do you pass parameters to a graph in AI ?
sixto.dsilva
- Jun 25th, 2008
Yes you can declare parametes in edit paramter option in GDE, while running the ksh you can pass the value in command line.
High5
- Feb 16th, 2008
If you want to pass a parameter to your graph then declare a formal parameter in edit-parametrs region.
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Abinitio Password
In production also do they will give same password which was given in .DBC?
sixto.dsilva
- Jul 3rd, 2008
Best way is using the environment variable to set the values in dbc file. By this you can have the flexibility to change any variable value's by changing the evironment variable.
njvijay
- May 11th, 2008
Good way doing this is, parameterize .dbc file. Parameter will have different values for different environment.
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How to rerun a graph in UNIX
Mathi777
- Jul 3rd, 2008
When ever a graph fails it creates a .rec file in the working directory ,the directory may be where ur graph deployed script is stored .so remove that .rec file an dthen run the deployed script of the graph from unix,u may use m_rollback -d
sixto.dsilva
- Jun 25th, 2008
You can run the graph by giving the following command in unix dtm run <recvory file name> -continue
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Have you used rollup component? Describe how.
sixto.dsilva
- Jul 3rd, 2008
Rollup summarises the group of data records based on key eg you want the income of a particular city from a set of records , you can use the rollup component.example dml ...
sangee
- Nov 29th, 2006
Rollup summarize the group of data records.for eg: if we want the maximum value of the cust_id we will go for rollup.
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Memory requirement of graph
How can I calculate the total memory requirement of a graph?
robmuza
- Jul 10th, 2008
When we did some benchmarking we found that it was closer to ~8MB + MAX_CORE (if any) per component and add in the file sizes.Basically, I agree with the existing answer.Just remember, don't use &...
dhanoo_p
- Jun 23rd, 2008
You can roughly calculate memory requirement as:1. Each partition of a component uses: ~ 7 MB + max-core (if any) 2. Add size of lookup files used in phase (if multiple compon...
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What is EME?
sixto.dsilva
- Aug 1st, 2008
As explained by Abishek, EME is the data repository(Datastore's data files)?as well a version controller compoent of ab initio software. It keeps track of obhects such as graph, dml, xfr, ksh and sq...
sreenivasamurthy
- Jun 20th, 2007
EME stands for Enterprise Meta Environment. It is nothing but like a repository in Informatica. It contains all the metadata i.e data related to graphs, dml, xfr, etc. It performs the following func...
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What is main path and structure of abinitio?
sixto.dsilva
- Aug 15th, 2008
Main paths in Ab initio environment are AB_HOME , specifiec the directory where the co>operating system is installed. This need only be set for those hosts for which the installation directory is diff...
sixto.dsilva
- Apr 17th, 2008
I think the main thing in above is AB_HOME , AB_AIR_ROOT , then sandboxes , standard environment. you need to be specific as what you want in this question.
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Under what circumstances join should be used instead on lookup.
biyyanimv
- Sep 2nd, 2008
If you have to perform full outer join then you should go for join not for lookup.
sixto.dsilva
- Apr 17th, 2008
Lookup should be used only to speedup the graph execution but here there is catch if the lookup file is small then only we should used lookup because when the graph start executing it will load whole ...
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What are the different schedulers used for running the abinitio graphs
abhi_fresh_as_dew
- Sep 8th, 2008
You can do anything in Ab Initio, depends on the logic you useSay there are 10 jobs 1,2,3,4,5 .. 10 and all the graphs are deployed as script.Suppose 1-4 graps should run at the same time and sequenti...
sreenivasamurthy
- Jun 19th, 2007
In ab initio there are no specific scheduling options as in informatica. What we can do is use cronjob options as in unix
Abinitio Interview Questions
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