2. Oracle Multitenant
Successful Migration of Oracle Taleo Business Edition (TBE) Cloud Service
Obaidur (OB) Rashid
Sr. Director, Product Development
Taleo Business Edition
Tom Michelini
Distinguished Product Manager
Oracle 12c
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
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3. Oracle Confidential – Internal/Restricted/Highly Restricted

4. Agenda 1
Introduction Context Transition Lifecycle Product Changes Operational Perspective Lessons Learned 2 3 4 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

5. Agenda Introduction Context Transition Lifecycle Product Changes1 1
Introduction
Context
Transition Lifecycle
Product Changes
Operational Perspective
Lessons Learned 2 2 3 3 4 4 5 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

6. Brief history and introduction to Taleo
Talent Intelligence
Established 1996
Originally headquartered out of Canada under the name Viasite
Moved to the San Francisco area in 1999 using the name Recruitsoft
March 2004 changed name to Taleo established headquarters in Dublin
A Talent Management organization with multiple products related to:
Recruiting
Performance Management
Compensation Management
February 2012 acquired by Oracle

7. Oracle Taleo Cloud Service
Industry's broadest cloud-based talent management platform
Oracle provides a number of Oracle Taleo products all on the cloud
Oracle Taleo Enterprise Cloud Service
Oracle Taleo Business Edition Cloud Service (TBE)
Oracle Taleo Recruiting Cloud Service
Oracle Taleo Onboarding Cloud Service
Oracle Taleo Performance Management Cloud Service
Oracle Taleo Goals Management Cloud Service
Oracle Taleo Succession Planning Cloud Service
Oracle Taleo Development Planning Cloud Service
Fusion Workforce Compensation
Oracle Taleo Social Sourcing Cloud Service
Oracle TBE Recruiting Cloud Service
Oracle TBE Onboarding Cloud Service
Oracle TBE Performance Management Cloud Service
Oracle TBE Compensation Cloud Service
Oracle TBE Learn Cloud Service

8. Taleo’s move to Oracle Oracle Database 12c (Database)
List of products used enabling the Taleo TBE move to Oracle Database 12c
Oracle Database 12c (Database)
Oracle SQL Developer (SQL Developer)
Oracle Developer Data Modeler (Data Modeler)
Oracle Express Data Loader (APEX)
Oracle Real Application Testing (RAT)
Oracle VM Server for x86 (OVM)
Oracle Enterprise Manager 12c (OEM)

9. Obaidur (OB) Rashid Head of Engineering for Taleo Business Edition
Head of Engineering for Taleo Business Edition
Bachelor & Master in Computer Science
15+ years in the software industry
Career in a nut shell 
Worked in small, medium and large companies
Developed products for Enterprise and SMB space
Immense experience with Cloud, SaaS and Multitenancy
Oracle
OnVantage
StarCite
Taleo
Oracle Confidential – Internal/Restricted/Highly Restricted

10. Agenda
Introduction Context Transition Lifecycle Product Changes Operational Perspective Lessons Learned 1 2 3 4 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

11. Taleo Business Edition
#1 Cloud Based Taleo Management Solution for the Midmarket

12. Rapid Growth Requires Robust Platform
Large customer base means lower risk tolerance
We need our database to have superior scalability and agility
Our customers want high availability and business continuity
Oracle RDBMS with Oracle RAC offers all of the above
Oracle Database 12c specifically was a shoo-in for TBE
Designed with cloud in mind
Optimized for multi-tenancy
Oracle Confidential – Internal/Restricted/Highly Restricted

13. Multitenant Persistence Models1 2 3
Tenant # 1
Tenant # 2
Tenant # n
Candidate
Tenant # 1
John
Doe
Tenant # 2
James
Smith
Tenant # n
Joanna
William
Tables
Tables
Tables
Tables
Tables
Tables
Tenant # 1
Tenant # 2
Tenant # n
Tables
Tables
Tables
Shared Database
Shared Database with Separate Schema
Separate Databases
Sharing
Isolation
Oracle Confidential – Internal/Restricted/Highly Restricted

14. TBE - High Level Architecture
Microsoft SQL Server
Users Across Tenants
Shared Middleware
Web Server / App Server
ORM Layer
Tenant # 1
Tenant # 2
Tenant # n
Oracle 12c Container Database
Users Across Tenants
Shared Middleware
Web Server / App Server
ORM Layer
Tenant # 1
Tenant # 2
PDB
Tenant # n
Oracle Confidential – Internal/Restricted/Highly Restricted

15. Operational Pressures
Business Drivers for 12c
Customers face great pressure to consolidate databases in cloud
Economic Pressures
Operational Pressures
Consolidate to cut costs
Reduce power
Reduce floor space
Reduce licenses
Deliver cloud-based agility
Self-service
Rapid provisioning
Simplified management
Requirements
Tenant isolation
Easy adoption
Manage many as one
Retain granular control

16. Database Consolidation on Clouds
Traditional consolidation methods
Consolidation Density
Virtual Machines
Clustered Databases
Multitenant Database
Schema Consolidation
Shared Servers
Shared Servers & OS
Shared Servers, OS, & Database

17. Oracle Database Architecture
Requires memory, processes and database files
System Resources GL OE AP

18. New Multitenant Architecture
Memory and processes required at container level only
System Resources GL OE AP GL OE AP

19. Agenda Introduction Context Transition Lifecycle Product Changes
Operational Perspective
Lessons Learned 1 3 3 4 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

20. Transition Lifecycle Stages of Transformation Rollout Gradually
Invest in PoC
Build Project Plan
Deep Dive
Certify
Rollout Gradually
Stages of Transformation

21. Invest in PoC Leverage SQL Developer to kick-off
Create schema generation scripts
Create data dump scripts
Construct a target 12c database
Re-create equivalent schema
Leverage SQL Loader to populate data
Point the application to the 12c database
Stabilize the app using (automated) test suite
Oracle Confidential – Internal/Restricted/Highly Restricted

22. SQL Developer Makes It Easy!

23. Setup Migration Repository

24. Choose 12c as The Target Database

25. Select Options Available for 12c

26. Kickoff The Migration Wizard

27. Review The Steps

28. Comparison View – Captured vs. Converted

29. Translation Scratch Editor

30. Transition Lifecycle Build Project Plan Deep Dive Certify
Coexistence strategy
Deep Dive
Details in the “Product Changes” section
Certify
Perform functional validation using traditional methods
Leverage Real Application Testing for PSR (more on next slide)
Oracle Confidential – Internal/Restricted/Highly Restricted

31. Oracle Real Application Testing
Source
Test
Database Replay
Workload capture
Workload processing
Workload replay
Analysis and reporting
Lower test infrastructure cost
Faster deployment
Oracle Confidential – Internal/Restricted/Highly Restricted

32. Transition Lifecycle Rollout gradually Build out a one-off stack
Put new customers on it
Migrate existing customer to it
Finally, open the flood gate
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33. Agenda 1
Introduction Context Transition Lifecycle Product Changes Operational Perspective Lessons Learned 2 3 4 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

34. Bootstrapping – Middle Tier
Update JDBC driver with oracle.jdbc.driver.OracleDriver
Update config. files (DBCP)
Driver Class Name
URL
Credentials (user & password)
validationQuery to the following: Select 1 From dual
Change ORM dialect to Oracle: org.hibernate.dialect.Oracle10gDialect
Oracle Confidential – Internal/Restricted/Highly Restricted

35. Bootstrapping – Database Tier
Create a common CDB user with DBA & SysDBA role per container
Create a PDB user with DBA privileges
Create a seed PDB for cloning purposes
create pluggable database <CDB Name> <Seed PDB Name> … options …
create pluggable database <CDB Name> from <Seed PDB Name>
Oracle Confidential – Internal/Restricted/Highly Restricted

36. DDL Changes
All database objects like tables, views, functions is created under "dbo”.
Drop the usage of “use <database>” instead do the following:
alter session set container=<PDB Name>;
alter session set current_schema='pdb_schema’;
Rename all objects to not exceed 30 characters
Rename columns with reserved word conflict
Level is a keyword and cannot be used a column name
Oracle Confidential – Internal/Restricted/Highly Restricted

37. DML Changes - Functions
Use built-in equivalent where possible
isnull  NVL
GetDate  SysDate
Leverage Util package for incompatible ones
DateDiff  UTILS.DateDiff
What to do about dynamic SQL at run time?
Oracle Confidential – Internal/Restricted/Highly Restricted

38. DML Conversion Utility Class
<package name>.DatabaseType.get<MethodName>

39. DML Changes – Misc.
Use fetch first <n> or rownum to work around the missing TOP n syntax
Update queries with cast to include include length:
SELECT (CAST (ENTITY_TYPE AS VARCHAR(5)))
Use “||” for Concatenation instead of “+”
Drop the usage of alias from DELETE FROM statements
Oracle Confidential – Internal/Restricted/Highly Restricted

40. Agenda 1
Introduction Context Transition Lifecycle Product Changes Operational Perspective Lessons Learned 2 3 4 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

41. Operational Perspective
Choose platform appropriately: Windows, Linux e.g.
Train people accordingly
Realize the coexistence strategy from infrastructure perspective
Enhance and adopt automation: build, packaging, deployment etc.
Evolve customer support infrastructure
Backup and “point in time” recovery
Setup “Read Only” user
Practice patching & upgrading
Oracle Confidential – Internal/Restricted/Highly Restricted

42. Deployment Topology using Oracle RAC
Cluster contains multiple container instances on different servers
Shared set of data files (storage)
Appears as single unified database to the app
Oracle RAC provides
Reliability
Error Detection
Recoverability
Continuous operations
Node3
Node2
Node1
CDB
CDB Instance 1
CDB Instance 2
CDB Instance 3
Oracle Confidential – Internal/Restricted/Highly Restricted

43. Data Migration Recipe Create template PDB with schema Source Database
Generate data dump file for all tables using BCP
Transport files to the data center / server as needed
Target Database
Clone the template PDB for each tenant in the target server
Leverage SQLLDR to import data for all the tables into the database
Enable all indexes and constraints
Oracle Confidential – Internal/Restricted/Highly Restricted

44. Agenda 1
Introduction Context Transition Lifecycle Product Changes Operational Perspective Lessons Learned 2 3 4 5 6
Oracle Confidential – Internal/Restricted/Highly Restricted

45. Lessons Learned – SQL Developer
Ensure object names in source database do not exceed 30 characters
SQL Developer auto renames column from SYS to SIS
You cannot specify the target schema name for the objects converted
You can leverage DB Copy to work around the above
For establishing the baseline do everything locally
Oracle Confidential – Internal/Restricted/Highly Restricted

46. Lessons Learned – Subtle Behavior Differences
Handling of NULL and empty strings
Position of NULL value when ORDER BY is used
Case sensitivity for LIKE and “=“ operators
Default date format (MM/DD/YY HH:MI AM vs. YYYY-MM-DD)
NVARCHAR(MAX) vs. CLOB handling of the JDBC driver
1000 limit for IN Clause
Oracle Confidential – Internal/Restricted/Highly Restricted

47. Lessons Learned – Misc.
Added the following for any 3rd party software using a older JDBC driver
SQLNET.ALLOWED_LOGON_VERSION_SERVER=8
Covered Index with INCLUDE option
Increased # of system data files by number of PDBs
Oracle Confidential – Internal/Restricted/Highly Restricted

48. Summary
Oracle DB 12c builds and improves upon the best RDBMS in the industry
Migrating databases is considered a hard problem and an ordeal
Oracle database team put in a lot of effort to make this journey easier
SQL Developer makes it very easy to get started
Oracle tools help each step of the way and help you reach the finish line
Oracle Confidential – Internal/Restricted/Highly Restricted

49. Oracle Multitenant Customer Success Stories
Multitenant Customer Sessions at Oracle OpenWorld 2014
Customer
Session
Venue
Title
SAS
CON6328
Mon 2:45pm
SAS Solutions OnDemand: A Multitenant Cloud Offering
Cigna
CON6379
Mon 5:15pm
Oracle Multitenant Customer Success Story GE
CON7304
Wed 10am
Oracle Multitenant: Seven Sources of Savings
Pulte Group
CON3203
Wed 3:30pm
Finding the Bleeding Edge Without Hemorrhaging
Sherwin-Williams
CON6387
Wed 4:45pm
Oracle Multitenant Deployment on Oracle Exadata
Taleo
CON7307
Thu 9:30am
Successful Migration of Taleo Business Edition Cloud Service
e-DBA
CON2785
Thu noon
Rolling Out a PaaS with Oracle Multitenant
HDFC Bank
CON3211
Thu 10:45am
Deliver Oracle Database Cloud: Multitenant on SuperCluster

50. Appendix
Oracle Confidential – Internal/Restricted/Highly Restricted

51. Create Connection for The Source Database

52. Inspect Source Database Visually

53. Select Connection for Migration Repository

54. Create A Project

55. Point to The Source Database Connection

56. Select The Specific Database to Migrate

57. Specify The Data Type Mapping Options

58. Select Objects to Translate

59. Scripts: Online vs Offine

60. Data: Online vs Offline

61. Summary

62. Cofirmation

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