Friday, November 8, 2013

ODI Helloworld tutorial- ODI Interface Table to Table data loading

ODI Helloworld tutorial- ODI Interface Table to Table data loading

In my previous posts, I have described about repositories and agents. Now lets get into the real implementation of data integration in ODI. In this blog, I will show the step by step process of implementing table to table integration in ODI.

Since this is the first implementation (for the same reason i am calling it hello world tutorial), I will also show the topology configuration, creating models and starting with a project in ODI.

Topology Configuration

 
Creating table to table integration involves only creating a interface in ODI. But there are some perquisites before we get in there.

Step 1. Create a physical server and logical servers. If they exist already check step2. Physical Servers are the configuration which point to the physical connection security details for database (oracle, sql servers, sybase etc), File, JMS, XML, Complex files etc. We can create physical connection for each environment (Dev, Test, Production) . Logical server is what used to run the interface. Based on the environment currently the interface is run, logical server points to the respective physical server.

Step 2. Check model is already existing for the database tables we are going to use. Model is nothing but reverse engineering the database tables, view, AQs etc for use in ODI objects. Model is applicable for File, XML, Complex files and JMS also. Even for File,XML, Complex Files and JMS the model is created in a relational way (as table datastores) in ODI.

Once both the steps are complete, we can create the interface. In this example, I have three schemas in XE database.
1. Oracle seeded HR schema - Has all HR related tables for demo purposes.
2. ODI_STAGE schema - I have created a new schema. This i will use for holding the temporary objects created by ODI
3. DATA_TARGET - I have created a new schema. This schema, I will use to create target tables.

I have employees table in hr and data_target. hr schema employees table has some data but data_target employees table is empty. Using the interface I create in ODI, i will load the data from hr.employees to data_target.employees table. Also create a primary key constraint on the  employee_id in target.


  CREATE TABLE "EMPLOYEES"
   (    "EMPLOYEE_ID" NUMBER(6,0),
    "FIRST_NAME" VARCHAR2(20 BYTE),
    "LAST_NAME" VARCHAR2(25 BYTE) NOT NULL ENABLE,
    "EMAIL" VARCHAR2(25 BYTE) NOT NULL ENABLE,
    "PHONE_NUMBER" VARCHAR2(20 BYTE),
    "HIRE_DATE" DATE NOT NULL ENABLE,
    "JOB_ID" VARCHAR2(10 BYTE) NOT NULL ENABLE,
    "SALARY" NUMBER(8,2),
    "COMMISSION_PCT" NUMBER(2,2),
    "MANAGER_ID" NUMBER(6,0),
    "DEPARTMENT_ID" NUMBER(4,0)
   );

Physical Server and Logical Server definition

After connecting to the work repository, go to topology tab.
Under physical architecture section, right click on Technologies->Oracle->New data server

Create a data server connection odi_stage schema. This is the schema which is entry point for ODI. we can use any schema here for data server but it should have access to all other schemas and objects which we are dealing with for creating models, insert, select, update data.
Here I am using ODI_STAGE schema as data server and HR and DATA_TARGET as physical schemas.
 In the definition tab, provide name and connection details for odi_stage schema.

 In the jdbc section, select the jdbc driver and connection details for oracle database instance.

Test the connection by selecting test connection. select Local(No Agent) to simulate odi client as agent.Select ok, if you get pop up to create physical schema, select ok.
Right click on the data server we just created and select new physical schema.
Right click on the data server and select new physical schema. lets create a physical schema for HR and DATA_TARGET schemas. In the create physical schema window, select the main schema and the work schema (schema where odi creates work tables like loading, error, integration tables). we can also provide prefix convention for the error, integration, loading tables which ODI creates in the work schema ODI_STAGE. we can also configure the masks which are specific to the technology we use.

Work Tables:-
Error - This table by default created with E$ prefix and it stores the primary key of the record which errored out and its corresponding error.
Loading - This table is the exact copy of the source data before any joins are done. This by default has C$ prefix.
Integration - This table is used to check the integration constraints check for data errors


Lets create a physical schema for DATA_TARGET also with schemas as data_target and work schema as ODI_STAGE.
Lets create a logical schema for hr and data_target here which maps to physical schema based on environment In logical architecture section right click on Oracle and select create logical schema. Here we are mapping it to Global context. We can also create DEV, TEST and PRODUCTION context and point the respective physical schema for context (which is nothing but environment reference). Since this is demo, i am using the existing context which is global.


Creating the Model

Lets create a model for HR and DATA_TARGET Schemas now.
Go to designer tab and under the models section, select New Model. Provide model name, technology as oracle, logical schema for HR.
Select the reverse engineer tab. Select the objects to reverse engineer here. we have two types of reverse engineering. we can use standard to standard reverse engineering. If we select customized, we would need to select reverse engineering knowledge module to reverse engineer the object. reverse engineering knowledge module is useful in case of reverse engineering Oracle Apps, Oracle BI etc which has some objects which needs specific methods to re-engineer in addition to regular jdbc reverse engineering. Select the reverse engineer button. ODI will take some time to reverse engineer the objects. In my case, it will take all the tables from HR schema and put it into the model. This will also fetch the constraints related to the tables.

This is how the model looks like. If we need to view data on the table, we right click and select view data on the table. In the model objects are referred with the term data store.
In the way, lets create a data model for the data_target schema. Both models HR and DATA_TARGET look like this after reverse engineering. data_target model has only one table and it is empty.

With this we have completed, configuring physical, logical schemas and creating the model.

 Creating Project and Interface


Lets create a project in which we have have the table to table interface.
In the designer tab, Projects section, create a new project and provide a name. Project code is an important identifier which is used identify project specific objects as compared to global objects.
Expand the project which created, right click on knowledge modules and select import knowledge modules. we need to select three knowledge modules here for loading, integration and check constraint. Select CKM Oracle,LKM SQL to SQL and IKM SQL Incremental update. We need to select knowledge modules specific to the technology and kind of data loading we are doing. KM automates the process with predefined code for loading, integration, check constraints, reverse engineering and journalizing (change data capture).

1. LKM SQL to SQL - Automates the loading of data from source to staging. reads data from hr.employees and put it into odi_staging.c$_employees.
2. IKM SQL Incremental Update - Takes the data from staging and merges (insert or update) data to target.
3. CKM Oracle - Check for specific constraints we need to check after loading in target.

After selection, we can verify the imported KMs in knowledge modules section.

Lets create an interface now. Under project->folder right click on interfaces and select new interface.
Provide name for interface and select the schema to which we need to load.
Click on the mapping tab in interface. Drag the employees table from hr model to source area and drag employees table from data_target model to target area. drag the field from source to target to complete the mapping. select the employee id in target mapping and verify that key attribute check box is checked. if not we cannot enable flow control in IKM and so make sure that it is checked.
Go to overview tab, select staging is different from target so that staging tables are created in odi_staging schema.

Go to flow tab. Select staging in the diagram and select LKM SQL to SQL from the drop down. This LKM has only one option which is delete temporary objects. make this true so that C$ temporary table is deleted once target loading is complete.
Select target in the flow tab and select the IKM from the drop down. IKM provides few options which we configure based on our needs.
FLOW_CONTROL - checks the contraints while loading into the target. error records are placed into E$ table.
TRUNCATE - truncates the target table before loading into it.
DELETE ALL - delete the rows instead of truncate
STATIC_CONTROL - checks the constraints after loading into target table.  But target table will still have the error records
RECYCLE_ERRORS - considers the rows from E$ table along with C$ table for integration loading into target so that if any records corrected, they will be recycled and loaded to target.
COMMIT - we can make this false if needed and we can do a seperate commit when this interface is part of a package so that we can maintain transaction for the objects used in ODI package.
CREATE_TARG_TABLE - creates target table if it doesn't exist at run time.
DELETE_TEMP_OBJECTS - deletes temporary I$ tables after target loading.

Select the controls tab and select the control knowledge modules. select the constraints to be enabled.
we have few options here to modify if any. we can ask ODI to drop the error table or check table here.


Save the interface.
With this we have completed creation of the interface. Lets run it now. Right click on the interface and click execute. Select gobal context, No agent and required log level. select ok. select ok on the session started dialog.
Go to operator tab to verify the run. expand all executions. Verify that our execution is successful. We can also expand the interface results and drill down to the steps executed at LKM, IKM and CKM levels and see the SQL generated and results here.


Lets verify the temporary tables created now. Go to the ODI_STAGING schema and verify the  E$, check tables. If we make delete temporary objects to false in LKM and IKM options, we will see C$ and I$ tables also here.
Lets check the target table for data.
With this we have completed the table to table loading using ODI interface. Please let me know if there are any questions.

8 comments:


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  2. Hi,

    This is very nice information with screenshots .. but in between screenshots if enabled that would really be of great help ..

    My source schema is HR - from Oracle Apps R12 database server

    And Final target Schema is - DEV_BIPLATFORM which gets created while installing OBIEE 11g product.

    I am stuck up with the blank table created on Target Schema to be viewed on ODI .. when Reverse Engineering is done its now showing as per the above given screen shot.. Any help will be well appreciated..

    can the iformation with all screenshot be mailed on my mail ID please - rohan.soman@ktcss.com

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