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4-2 Prepare: Writing a Plan and Getting Ready to Migrate
Determine Migration Approach Adaptive Server Enterprise 11.5
The Table 4-1 highlights the advantages and disadvantages of each
migration approach.
For more information on these approaches, see the following
sections:
• Parallel With Replication 4-3
• Cutover Without Replication 4-5
• Phased Cutover 4-7
Table 4-1: Migration approaches
Approach Advantages Disadvantages When Used
Parallel
With
Replication
Easy fallback to release
10.0.2.5 or later. You do not
need to rebuild release
10.0.2.5 or later databases.
Minimal system down
time.
Can be complex in OLTP
environments.
Replication Server must be
set up, requiring extra
hardware and software.
You must be at release
10.0.2.5 or later. You can
replicate from release 4.x,
but you cannot replicate to
release 4.x.
This approach is best for
large 7x24 production
databases, maintaining
high availability, when:
• Rebuilding a release
10.0.2.5 or later database
can take too long.
• The system may have a
large number of
transactions and
complex Transact-SQL
queries with subqueries.
Cutover
Without
Replication
Can be executed with
minimal resource
demands.
Highest risk. Requires
down time for critical
migration tasks.
Recovery can be time
consuming in a production
environment.
This approach is likely for
resource-constrained
environments.
Phased
Cutover
Low risk with low
development overhead.
Especially conducive to
testing.
May require additional
resources—either more
memory or a second
system, if both
pre-release 11.x and
release 11.x servers do not
perform acceptably on the
current system.
Requires tighter
coordination with
application groups and
database owners.
If neither of the other two
approaches seems
appropriate, you can use a
phased cutover.
- Migrating to Sybase® 1
- Table of Contents 5
- A. The Cyrano Migration Pack 9
- E. Migration Plan Checklist 12
- List of Tables 13
- Introduction and Guide to 15
- Resources 1 15
- Chapter Title Contents 16
- Technical Information Library 18
- Migration Web Page 19
- Migration Courses 19
- Sybase Press Books 20
- Third-Party Books 20
- Consulting Services 20
- Third-Party Tools 21
- If You Need Help 21
- Analyze: Documenting Business 23
- Requirements 2 23
- Acme Brokerage Company 24
- System Architecture 24
- Availability Requirements 25
- Database Change Metrics 25
- Maintenance Procedures 26
- Service Level Requirements 27
- Current Performance Metrics 28
- • Vendor issues 30
- Analyze: Documenting Your 31
- Environment 3 31
- CPU Resources per Machine 32
- Disk Configuration 32
- Network Configuration 34
- Tape Configuration 34
- Physical Memory Utilization 35
- Software Configuration 36
- Sybase Configuration 37
- SQL Server Objects 40
- If You Don’t Have Scripts 41
- Ready to Migrate 4 43
- Parallel With Replication 45
- Cutover Without Replication 47
- Phased Cutover 49
- Write a Migration Plan 50
- Update Hardware Resources 51
- Create Migration Scripts 52
- Implement: Making Required 55
- Application Changes 5 55
- Datatype Changes 57
- Table 5-3: Datatype hierarchy 59
- Name Hierarchy 59
- Subquery Processing Changes 62
- NULL Algodata Infosystems 64
- NULL New Age Books 67
- Binnet & Hardley 67
- Algodata Infosystems 67
- 250 no rows returned 68
- Enterprise 11.5 73
- Login and Password Changes 82
- RUN File Renamed 83
- New create table Permission 84
- New Backup Server 85
- Last Chance Threshold 85
- Reference Supplement 86
- Configuration Interface 88
- Old Name New Name 89
- Databases Online / Offline 90
- Increased Memory Requirements 92
- Figure 6-1: Areas of memory 93
- 4.x 125% 96
- 10.x 50% 96
- 11.0.x 25% 96
- Optional Space Considerations 98
- Test: Ensuring Stability and 101
- Performance 7 101
- Make Backups 102
- Summary of Testing Techniques 104
- • Production load capture 105
- Writing Performance Scripts 106
- Test Cycle: Summary of Tests 109
- Stage Purpose Best Technique 110
- Pre-Upgrade Single-User Tests 111
- Pre-Upgrade Multi-User Tests 111
- Test System Upgrade 112
- Post-Upgrade Multi-User Tests 113
- The Cyrano Migration Pack A 115
- For More Information 117
- A-4 The Cyrano Migration Pack 118
- Worksheets for Your Current 119
- Environment B 119
- Backup and Restore Procedures 121
- Database Dump Details 122
- Data Architecture Worksheet 124
- Transaction Profile 126
- Host Configuration 127
- Record CPU resources: 128
- Physical Memory Usage 129
- Operating System Configuration 134
- Detail the operating system 134
- SQL Server Configuration 135
- Table B-18: dbcc output 136
- Usage MB 2K Pages Bytes 136
- Database Devices 137
- Databases and Segments 138
- Dump Devices 139
- Migration Approach Outline 141
- In This Appendix 145
- Sample Task List Template 145
- Migration Analysis 146
- Migration Preparation 147
- Migration Quality Assurance 151
- Set Up Replication Server 154
- Run Regression Test Suites 154
- Perform Final Steps 156
- Staged Cutover Task Overview 161
- Migration Plan Checklist E 163
- Logical Support Architecture 165
- Migration Strategy Design 165
- E-4 Migration Plan Checklist 166
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