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CHAPTER 7 Test: Ensuring Stability and Performance
85
Writing Performance Scripts
This section discusses the basics of writing performance scripts:
• Write Benchmark Scripts
• Drivers
Write Benchmark Scripts
In general, you have to write special benchmark scripts rather than rewriting
applications as benchmarks.
To write the benchmark script:
• Add a function to
funcs.c for each transaction
• Generate any run-time data required (such as primary key to select or data
to insert)
• Write code to submit SQL or stored procedure(s) to Adaptive Server (for
example, using
dbsqlexec() calls)
Transaction
generation
Thin client to simulate
user execution of
transactions
• Strong multiuser load
testing
• Focus on back-end
server issues
• May increase development time for
creating multiuser test simulations,
though learning and development
curve generally less than keystroke
capture tools
• Adds time for debugging test harness
to prevent skewed results
• Depends on strong analysis of process
or transaction profiles
Production
load capture
Using tools to capture
real transactions in a
production environment,
including performance
and semantic
characteristics, and
resubmit in a test
environment for analysis
• Tests real production
loads, including ad
hoc queries
• Especially useful
when little or no
analysis of
transaction profiles is
available
• Introduces new software into a
production environment
• Production and test system
configurations must be identical for
valid performance analysis
Technique Description Advantages Disadvantages
- Migrating to Adaptive Server 1
- Enterprise 12.5 1
- 34982-01-1250-01 2
- Oct 2001 2
- Contents 3
- Introduction and Guide to 9
- Resources 9
- Other Sources of Information 11
- Migration Web Page 13
- Consulting Services 13
- If You Need Help 14
- Requirements 15
- Diagramming the System 16
- Availability Requirements 17
- Database Change Metrics 18
- Maintenance Procedures 18
- Service Level Requirements 19
- Current Performance Metrics 20
- Analyze: Documenting Your 23
- General Server Hardware 24
- CPU Resources per Machine 24
- Disk Configuration 24
- Physical Memory Utilization 26
- Software Configuration 27
- Sybase Configuration 28
- General Information 29
- Adaptive Server Objects 31
- Query Sybase System Tables 32
- Use System Stored Procedures 32
- Use Sybase Tools 32
- Ready to Migrate 33
- Review the Upgrade Process 34
- Determine Migration Approach 36
- Parallel With Replication 37
- Cutover Without Replication 39
- Phased Cutover 41
- Write a Migration Plan 43
- Update Hardware Resources 44
- Products 45
- Create Migration Scripts 46
- Implement: Making Required 47
- Application Changes 47
- If Your Version is 11.5 48
- Changes to Error Checking 50
- Changes in Error Numbers 51
- New and Changed Statistics 54
- Aggregate Optimization 56
- Costing Large I/O 56
- The optdiag Utility 56
- Trace Flag 302 56
- ANSI Joins 58
- 12.0 Query Processing Changes 60
- 50 Tables in a Query 61
- Abstract Query Plans 61
- Increased Optimization Time 62
- Changes to Transact-SQL 63
- New Reserved Words 64
- Change in Truncation Behavior 66
- Administration Changes 69
- Implement: Making Database 69
- Optimizer Changes 71
- Trace Flag 326 72
- Documentation Changes 73
- Backup Server 73
- Network Connections 74
- File Descriptors 74
- Non-Rewinding Tapes 74
- Starting Backup Server 74
- Dump Format 75
- Changes to dbids 76
- CIS Proxy Databases 77
- The sybsyntax Utility 77
- Changes to Documentation 78
- System Database Sizes 78
- Changes to System Tables 79
- New Database and Table Limits 80
- Configuration Parameters 82
- 86016 (84K) - 64-bit 83
- Increased Memory 84
- Test: Ensuring Stability and 87
- Performance 87
- Make Backups 88
- Summary of Testing Techniques 91
- Writing Performance Scripts 93
- General Error Handling 94
- Deadlock Handling 94
- Result Handling 95
- Time Measurement 95
- Runtime Data Generation 95
- Test Cycle: Summary of Tests 96
- Pre-Upgrade Single-User Tests 97
- Pre-Upgrade Multi-User Tests 98
- Test System Upgrade 99
- Post-Upgrade Multi-User Tests 99
- Untimed Benchmarks 100
- Timed Benchmarks 100
- Worksheets for Your Current 101
- Environment 101
- Backup and Restore Procedures 102
- Database Dump Details 103
- Data Architecture Worksheet 105
- Transaction Profile 107
- Host Configuration 109
- Physical Memory Usage 110
- Disk I/O Configuration 111
- Network Configuration 113
- Tape Configuration 114
- Adaptive Server Configuration 115
- Database Devices 116
- Databases and Segments 117
- Dump Devices 118
- Sample Migration Task Lists 119
- Migration Analysis 120
- Gather Business Requirements 121
- Develop Migration Strategy 121
- Migration Preparation 122
- Create Target Environment 123
- Perform Server Migration 124
- Perform Database Migration 124
- Perform Data Migration 124
- Perform Application Migration 124
- Upgrade Adaptive Server 125
- Complete Migration 125
- Migration Quality Assurance 126
- Perform User Acceptance Tests 127
- Set Up Replication Server 129
- Run Regression Test Suites 129
- Upgrade Server B (Shadow) 130
- Other Testing 131
- Perform Final Steps 132
- Staged Cutover Task Overview 137
- Migration Issue Checklists 139
- Logical Support Architecture 141
- Migration Strategy Design 142
- Pre-Upgrade Checklist 143
- .cfg) file 145
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