This document discusses the successful migration of Oracle's Taleo Business Edition cloud service to Oracle Database 12c. It provides context on TBE's rapid growth necessitating a more robust database platform. It describes how Oracle 12c was well-suited for the migration due to its optimizations for multi-tenancy and cloud deployments. The document also outlines the transition lifecycle and lessons learned from the project.

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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

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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.
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Agenda
Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
1
2
3
4
5
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Restricted
3
6

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Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
Agenda
1
2
3
4
5
Oracle
Confiden@al
–
Internal/Restricted/Highly
Restricted
4
1
2
3
4
5
6

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Obaidur
(OB)
Rashid
• Head
of
Engineering
for
Taleo
Business
Edi@on
• Bachelor
&
Master
in
Computer
Science
• 15+
years
in
the
soware
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
Confiden@al
–
Internal/Restricted/Highly
Restricted
5
Oracle
OnVantage
StarCite
Taleo
Twi@er:
@orashid

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Agenda
Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
3
4
5
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6
2
1

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

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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
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Mul@tenant
Persistence
Models
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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

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TBE
-­‐
High
Level
Architecture
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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

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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

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Mul,tenant
Database
Schema
Consolida,on
Consolida@on
Density
Database
Consolida@on
on
Clouds
Tradi,onal
consolida,on
methods
12
Shared
Servers
Shared
Servers
&
OS
Shared
Servers,
OS,
&
Database
Virtual
Machines
Clustered
Databases

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Oracle
Database
Architecture
Requires
memory,
processes
and
database
files
13
System
Resources
GL
OE
AP

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AP
OE
GL
New
Mul@tenant
Architecture
Memory
and
processes
required
at
container
level
only
14
System
Resources
GL
OE
AP

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Agenda
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15
3
4
5
6
Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
3
1

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Transi@on
Lifecycle
Stages
of
Transforma,on
16
Invest
in
PoC
Build
Project
Plan
Deep
Dive
Cer@fy
Rollout
Gradually

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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
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SQL
Developer
Makes
It
Easy!

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Setup
Migra@on
Repository

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Choose
12c
as
The
Target
Database

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Select
Op@ons
Available
for
12c

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Kickoff
The
Migra@on
Wizard

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Review
The
Steps

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Comparison
View
–
Captured
vs.
Converted

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Transla@on
Scratch
Editor

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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)
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Oracle
Real
Applica,on
Tes,ng
• Database
Replay
– Workload
capture
– Workload
processing
– Workload
replay
– Analysis
and
repor@ng
• Lower
test
infrastructure
cost
• Faster
deployment
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Source
Test

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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
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Agenda
Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
1
2
4
5
6
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3

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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
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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>
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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
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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?
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DML
Conversion
U@lity
Class
<package
name>.DatabaseType.get<MethodName>

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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
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Agenda
Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
1
2
3
5
6
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4

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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
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Deployment
Topology
using
Oracle
RAC
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Node3Node2Node1
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

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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
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Agenda
Introduc@on
Context
Transi@on
Lifecycle
Product
Changes
Opera@onal
Perspec@ve
Lessons
Learned
1
2
3
4
6
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5

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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
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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
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Lessons
Learned
–
Misc.
• Added
the
following
for
any
3rd
party
soware
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
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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
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• 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

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Oracle
Confiden@al
–
Internal/Restricted/Highly
Restricted
46