Presentation sql server to oracle a database migration roadmap

SQL Server to Oracle
A Database Migration Roadmap
Louis Shih
Superior Court of California
County of Sacramento
Oracle OpenWorld 2010
San Francisco, California

Agenda
 Introduction
 Institutional Background
 Migration Criteria
 Database Migration Methodology
 SQL/Oracle Tool for Data Migration
 Questions
DataBase Migration Roadmap
2

Institutional Background
 The Superior Court of California (SacCourt), County of
Sacramento is part of the statewide justice system of 58 trial
courts, Appellate Courts and the California Supreme Court.
 Each county operates a Superior Court that adjudicates criminal,
civil, small claims, landlord-tenant, traffic, family law, and juvenile
dependency and delinquency matters.
 SacCourt has 60 judicial officers and 760 staff who processed
over 400,000 new cases filed in FY 2008-09.
“Our Mission is to assure justice, equality and fairness for all under the law.”
3

Database Environment
 SQL Server
• SQL Server 6.5, 2000, 2005 32-bit on Window
• SQL Server 2008 64-bit on VMWare/Physical Hardware
 Oracle
• Oracle 10G R2, 10G R2 RAC on Sun SPARC Solaris 10
• Oracle Enterprise Manager, Grid Control on Window
• Oracle Application Express
• Oracle Migration Workbench
4

Migration Objectives
 Validate the purpose of migration.
 Achieve Return of Investment.
 Compatibility of Hardware and Software.
 Accomplish Physical and Logical Model.
 Meet Source and Target Application/Database Criteria.
 Minimize Outage Time.
“No single best method for all cases!”
5

Migration Process
 Analyze
• Database Architecture
• Cost-Effectiveness
• Risk Mitigation
 Plan
• Routines
• Downtime
 Perform
• Data Migration
 Verify
• Migration Success 6

Migration Methodology
 Recommend approaches
• Traditional Waterfall System Life Cycle over Rapid Application
Development
• “As-Is” approach
 Upgrade after migration.
 Automate using Oracle Migration WorkBench.
 Create custom installation scripts.
7

SQL to Oracle Migration
1. Physical and Logical Structure
1.1 Characteristics
1.2 Data Types/Storage
1.3 Recommendations
2. Stored Procedures
3. SQL Migration
4. Database Design
5. Schema Design
6. Data Migration
7. Security
8

 Map Similar Database Objects
• Schema objects, data types
• Referential integrity, constraints, rules
• Triggers, stored procedure, system catalogs
 Map Different Database Objects
• Connection types or models
• Temporary tables
• Application programming
• Data migration
9
Physical and Logical Structure

Memory SMON
PMON
MMON
……..
Process
(Dedicated/Shared)
SystemTablespace
(System,Sysaux,
Temp,Undo)
User1Tablespace
User2Tablespace
Oracle Instance/Database
Database
MasterDB
Model,Msdb,Tempdb,
resource(2008)
Database1
Process
Memory
Master = System Tablespace
Model = Template
Tempdb = Undo
Msdb = Agent Services
System = Sys Objects
Sysaux = 10g Nonsys Objects
Temp = Sorting
Undo = Rollback, Recover
SQL Server
Database2
10

1.1 Characteristics
SQL Oracle
Instances/Database SGA/SID
Case Insensitive N/A
Database Database
Database and Database Owner (DBO) Schema
Database Tablespace
T-SQL Stored Procedure PL/SQL Procedure, Function or
Package
Triggers After Triggers
Complex Rules Before Triggers, Trigger for Each Row
Identity Property for a Column Sequences
View View, M-View
11

1.1 Characteristics (Cont.)
SQL Oracle
Transaction Logs Per Database Transaction Logs for Entire Database
Auto Commit Manual Commit or Rollback
Manual Exception Default Exception
SA Account System/manager Account
sysconfig spfile
12

1.2 Data Types/Storage
SQL Oracle
Integer, Small Int, Tiny Int, Bit, Money,
Small Money
Number (10, 6, 3, 1, 19, 10)
Real, Float Float
Text CLOB
Image BLOB
Binary, VarBinary RAW
DateTime, Small DateTime Date
Varchar2 (max) LONG, CLOB
Varbinary (max) LONG RAW, BLOB, BFILE
13

1.2 Data Types/Storage (Cont.)
SQL Oracle
Database Devices Datafile
Page Data Block
Extent Extent and Segments
Segments Tablespace (Extent and Segments)
Log Devices Redo Log Files
Data, Dump N/A
14

1.3 Recommendations
SQL Oracle
MS Applications tend to use ASP on Clients.
ASP uses ADO to communicate to DB.
Use Oracle OLE/DB or migrate to JSP.
DB Library Use Oracle OCI calls.
IIS/ASP IAS/Fusion on JAVA 2 Platform, J2EE
Embedded SQL from C/C++ Manual conversion
Stored Procedure return Multiple Sets Find driver support Reference Cursors (i.e.
DataDirect).
Delphi, MS Access (Embedded SQL/C or MS
Library)
Use ODBC Driver.
DBO.Database Transform to Single or Multiple Schema.
DTS/SSIS Warehouse Builder
15

2. Stored Procedures
 Use Package for nested procedures.
 Use Functions for User-Defined Functions.
 Use Hints or CBO.
 Remove Create/Drop temporary tables.
16

3. SQL Migration
 TOP function
 Dynamic SQL  No conversion
 Case statements  Decode
 Unique identifier (GUID)  ROWID or UROWID
Example:
select newid()
vs.
select sys_guid() from dual
17

4. Database Design
 Evaluate Constraints
• Entity Integrity
• Referential Integrity
• Unique Key
• Check
 Use Table Partitions.
 Apply Reverse Key for sequence generated columns.
 Apply Flashback for restoration.
 Use Oracle RAC, Active DataGuard for HA/DR.
 Use Transparent Data Encryptions and remove
data encryptions.
18

4. Database Design (Cont.)
 Outer Joins
 Oracle Exceptions (i.e. no_data_found)
 Autonomous Transactions
 Records and Types
 Reverse Key for RAC environment
19

5. Schema Design
 Table (Data Types, Constraints)
• Numeric (10, 2)  Number (10, 2)
• Datetime (Oracle 4712 BC, SQL 01/01/0001 – 12/31/9999)
 Views (Materialized views)
 Trigger (Functionality difference)
 Synonyms (Public or Private)
 Spatial
Create table abc (id number (10) not null, geo dsys.sdo_geometry)
vs.
Create table abc (id number (10) not null, geo geography)
20

5. Schema Design (Cont.)
 Data Types
• Datetime
1/300th of a second vs. 1/100th million of a second
 Image and Text
• Image of data is stored as pointer vs. Image stored in BLOB
and Text in CLOB
 User-Defined
• Equivalent to PL/SQL data type
 Table Design
Create table sample
(datetime_col datetime not null,
integer_col int null,
text_col text null,
varchar_col varchar2 (10) null)
Create table sample
(datetime_col date not null,
integer_col number null,
text_col long null,
varchar_col varchar2 (10) null)
21
OracleSQL

6. Data Migration
 SQL Loader
 Data Pump
 Stream
 Database Link or Transparent Gateway
• Create table as select.
• Insert as select.
22

7. Security
 Create user accounts in Oracle.
 Leverage default Role and Privs.
 Map user accounts to Role.
23

SQL/Oracle Tool for Migration
 Oracle Migration Workbench
 OEM/Grid Control
 Upgrade SQL to ver. 2005 with Transparent Gateway
 Oracle APEX
 Scripting
24

Presentation sql server to oracle a database migration roadmap

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Presentation sql server to oracle a database migration roadmap