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Migrating to Sybase Adaptive Server Enterprise 11.5 5-21
Adaptive Server Enterprise 11.5 If Your Current Version is 4.x, 10.x, or 11.0.x
For more information, see the section on the set command in the
Adaptive Server Enterprise Reference Manual.
Sorted Order in Queries with Clustered Indexes
Queries on tables with clustered indexes have, in past releases,
returned results in a predictable order, that is, index order. However,
this behavior was never guaranteed by
select semantics. and was only
an artifact of linear processing.
Adaptive Server may now perform a parallel scan on a clustered
index if this is the best plan. In this case, results may not return in the
same order as before; they may, in fact, differ in order between
different executions of the same query. If the query specifies
rowcount,
the results may be completely different. This is not an error.
If you need results returned in a certain order, do not rely on the
existence of a clustered index. Use an explicit
order by clause.
Changes Due to Two-Phase Commit Enhancements
If you upgraded your existing two-phase commit configuration to
the new 11.5 configuration, make sure that user applications or
stored procedures reference sybsystemdb..spt_committab instead of
master..spt_committab. For more information about changes to two-
phase commit, see Chapter 6, “Implement: Making Required
Database Administration Changes”, as well as What’s New in Sybase
Adaptive Server Enterprise 11.5.
A Few Transact-SQL Programming Tips
How you code can affect optimizer decisions. The following sections
contain a few programming tips that may improve your processing
speed:
• Syntax That Can Slow You Down 5-21
• General Tips 5-24
• Learn More About Coding For Performance 5-25
Syntax That Can Slow You Down
The following examples show syntax that can take longer to process
than some simple alternatives:
- 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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