oow-tbe-12c-con7307-sharable

Copyright © 2014, Oracle and/or its affiliates. All rights reserved. | Oracle Confiden@al – Internal/Restricted/Highly Restricted Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |

Obaidur (OB) Rashid Sr. Director, Product Development Taleo Business Edi@on Tom Michelini Dis@nguished Product Manager Oracle 12c

Oracle Open World Oracle 12c Mul,tenant Successful Migra,on of Taleo Business Edi,on Cloud Service

Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |

Safe Harbor Statement The following is intended to outline our general product direc@on. It is intended for informa@on purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or func@onality, and should not be relied upon in making purchasing decisions. The development, release, and @ming of any features or func@onality described for Oracle’s products remains at the sole discre@on of Oracle.

Oracle Confiden@al – Internal/Restricted/Highly Restricted 2


Agenda

Introduc@on

Context

Transi@on Lifecycle

Product Changes

Opera@onal Perspec@ve

Lessons Learned

1

2

3

4

5


6


Introduc@on

Context

Transi@on Lifecycle

Product Changes


Lessons Learned

Agenda

1

2

3

4

5


1

2

3

4

5

6


Obaidur (OB) Rashid

• Head of Engineering for Taleo Business Edi@on • Bachelor & Master in Computer Science •  15+ years in the so\ware industry • Career in a nut shell à

– Worked in small, medium and large companies – Developed products for Enterprise and SMB space – Immense experience with Cloud, SaaS and Mul@tenancy


Oracle

OnVantage

StarCite

Taleo

Twi@er: @orashid


Agenda

Introduc@on

Context

Transi@on Lifecycle

Product Changes


Lessons Learned

3

4

5


6

2

1


Taleo Business Edi@on #1 Cloud Based Taleo Management Solu,on for the Midmarket


Rapid Growth Requires Robust Pla`orm

•  Large customer base means lower risk tolerance • We need our database to have superior scalability and agility • Our customers want high availability and business con@nuity • 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 – Op@mized for mul@-‐tenancy



Mul@tenant Persistence Models


Tenant # 1 Tenant # 2 Tenant # n

Shared Database Separate Databases Shared Database with Separate Schema

Tables Tables Tables

Tenant # 1 Tenant # 2 Tenant # n Candidate

Tenant # 1 John Doe

Tenant # 2 James Smith

Tenant # n Joanna William

1 2 3

Tables Tables

Tables Tables

Tables Tables

Isola,on Sharing


TBE -‐ High Level Architecture


Microso\ 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 PDB PDB

Tenant # n


Customers face great pressure to consolidate databases in cloud

Business Drivers for 12c

Requirements •  Tenant isolation •  Easy adoption •  Manage many as one •  Retain granular control

Economic Pressures Opera@onal Pressures

Consolidate to cut costs •  Reduce power •  Reduce floor space •  Reduce licenses

Deliver cloud-‐based agility •  Self-‐service •  Rapid provisioning •  Simplified

management


Mul,tenant Database Schema Consolida,on

Consolida@

on Den

sity

Database Consolida@on on Clouds Tradi,onal consolida,on methods

12

Shared Servers Shared Servers & OS Shared Servers, OS, & Database

Virtual Machines Clustered Databases


Oracle Database Architecture Requires memory, processes and database files

13

System Resources

GL OE AP


AP OE GL

New Mul@tenant Architecture Memory and processes required at container level only

14

System Resources

GL OE AP


Agenda


3

4

5

6

Introduc@on

Context

Transi@on Lifecycle

Product Changes


Lessons Learned

3

1


Transi@on Lifecycle Stages of Transforma,on

16

Invest in PoC

Build Project Plan

Deep Dive

Cer@fy

Rollout Gradually


Invest in PoC

•  Leverage SQL Developer to kick-‐off – Create schema genera@on scripts – Create data dump scripts

• Construct a target 12c database – Re-‐create equivalent schema – Leverage SQL Loader to populate data

• Point the applica@on to the 12c database •  Stabilize the app using (automated) test suite



SQL Developer Makes It Easy!


Setup Migra@on Repository


Choose 12c as The Target Database


Select Op@ons Available for 12c


Kickoff The Migra@on Wizard


Review The Steps


Comparison View – Captured vs. Converted


Transla@on Scratch Editor


Transi,on Lifecycle

• Build Project Plan – Coexistence strategy

• Deep Dive – Details in the “Product Changes” sec@on

• Cer@fy – Perform func@onal valida@on using tradi@onal methods – Leverage Real Applica@on Tes@ng for PSR (more on next slide)



Oracle Real Applica,on Tes,ng

• Database Replay – Workload capture – Workload processing – Workload replay – Analysis and repor@ng

•  Lower test infrastructure cost •  Faster deployment


Source Test


Transi,on Lifecycle

• Rollout gradually – Build out a one-‐off stack – Put new customers on it – Migrate exis@ng customer to it – Finally, open the flood gate



Agenda

Introduc@on

Context

Transi@on Lifecycle

Product Changes


Lessons Learned

1

2

4

5

6


3


Bootstrapping – Middle Tier

• Update JDBC driver with oracle.jdbc.driver.OracleDriver • Update config. files (DBCP)

– Driver Class Name – URL – Creden@als (user & password) –  valida@onQuery to the following: Select 1 From dual

• Change ORM dialect to Oracle: org.hibernate.dialect.Oracle10gDialect



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> … opCons …

create pluggable database <CDB Name> from <Seed PDB Name>



DDL Changes

• All database objects like tables, views, func@ons 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



DML Changes -‐ Func@ons

• Use built-‐in equivalent where possible –  isnull à NVL –  GetDate à SysDate

•  Leverage U@l package for incompa@ble ones –  DateDiff à UTILS.DateDiff

• What to do about dynamic SQL at run @me?



DML Conversion U@lity Class

<package name>.DatabaseType.get<MethodName>


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 Concatena@on instead of “+” • Drop the usage of alias from DELETE FROM statements



Agenda

Introduc@on

Context

Transi@on Lifecycle

Product Changes


Lessons Learned

1

2

3

5

6


4


Opera,onal Perspec,ve

• Choose pla`orm appropriately: Windows, Linux e.g. •  Train people accordingly • Realize the coexistence strategy from infrastructure perspec@ve •  Enhance and adopt automa@on: build, packaging, deployment etc. •  Evolve customer support infrastructure

– Backup and “point in @me” recovery – Setup “Read Only” user

• Prac@ce patching & upgrading



Deployment Topology using Oracle RAC


Node3 Node2 Node1

CDB

CDB Instance 1 CDB Instance 2 CDB Instance 3

• Cluster contains mul@ple container instances on different servers

•  Shared set of data files (storage) • Appears as single unified database to the app • Oracle RAC provides

– Reliability – Error Detec@on – Recoverability – Con@nuous opera@ons


Data Migra@on 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



Agenda

Introduc@on

Context

Transi@on Lifecycle

Product Changes


Lessons Learned

1

2

3

4

6


5


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



Lessons Learned – Subtle Behavior Differences

• Handling of NULL and empty strings • Posi@on of NULL value when ORDER BY is used • Case sensi@vity 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



Lessons Learned – Misc.

• Added the following for any 3rd party so\ware using a older JDBC driver SQLNET.ALLOWED_LOGON_VERSION_SERVER=8

• Covered Index with INCLUDE op@on •  Increased # of system data files by number of PDBs



Summary

• Oracle DB 12c builds and improves upon the best RDBMS in the industry • Migra@ng 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 Database 12c (Database) • Oracle SQL Developer (SQL Developer) • Oracle Developer Data Modeler (Data Modeler) • Oracle Express Data Loader (APEX) • Oracle Real Applica@on Tes@ng (RAT) • Oracle VM Server for x86 (OVM) • Oracle Enterprise Manager 12c (OEM)

Taleo’s move to Oracle List of products used enabling the Taleo TBE move to Oracle Database 12c

oow-tbe-12c-con7307-sharable

Documents

oracle andor

oracle database

tenancy oracle conden

c oracle open world

nuity oracle rdbms

oracle rac oers

midmarket copyright

orashid copyright