GC_ROLLBACK_SEGMENTS (Oracle7 Only)
by Brian Laskey, David C. Kreines
Oracle Database Administration: The Essential Refe
- Dedication
- Preface
- I. DBA Tasks
- 1. Introduction
- 2. Installation
- 3. Maximizing Oracle Performance
- 4. Preventing Data Loss
- 5. Oracle Networking
- Oracle Names
- MultiProtocol Interchange
- Connecting to Non-Oracle Databases
- Network Manager Data Storage
- Using Network Manager
- Files Created by Network Manager
- Oracle Net8 Assistant
- Manual Network Configuration
- Sample SQL*Net Files
- SQL*Net Troubleshooting
- 6. Security and Monitoring
- 7. Auditing
- 8. Query Optimization
- 9. Oracle Tools
- 10. The Oracle Instance
- 11. The Oracle Database
- 12. Initialization Parameters
- 13. SQL Statements for the DBA
- SQL Commands by Task
- SQL Command Syntax
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- Reference Section
- column_constraint_clause
- auto_extend_clause
- for_clause
- filespec
- autoextend_clause
- global_index_clause
- local_index_clause
- table_constraint_clause
- table_ref_clause
- column_ref_clause
- column_constraint_clause
- index_organization_clause
- segment_attrib_clause
- partition_clause
- autoextend_clause
- 14. The Oracle Data Dictionary
- Static Data Dictionary Views
- Dynamic Performance Data Dictionary Views
- 15. System Privileges and Initial Roles
- 16. Tools and Utilities
Name
GC_ROLLBACK_SEGMENTS (Oracle7 Only)
Synopsis
Values:2 to unlimited
Default:20
Multiple Instances:Must have identical values
Specifies the maximum number of system-wide rollback segments when running Oracle Parallel Server. Set this parameter to the total number of rollback segments acquired by all instances in a parallel server, including the SYSTEM rollback segment. To provide for additional instances in the future, or additional rollback segments for the current instances, this parameter can be set to a higher value. Each rollback segment requires one distributed lock, specified by this parameter, in addition to the number specified by the GC_ROLLBACK_LOCKS parameter. The total number of distributed locks for rollback segments is:
| GC_ROLLBACK_SEGMENTS × (GC_ROLLBACK_LOCKS + 1) |
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