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CDB/Runstats

CDB Software Active z/OS

Performance Db2

Vendor

CDB Software

Product Overview

The architecture of CDB/Runstats consists of several key components designed to enhance Db2 performance on z/OS. The core component is the RUNSTATS engine, which is responsible for collecting statistical data. This engine interacts directly with the Db2 catalog to gather and update statistics.

The reporting module provides the functionality to view and analyze the collected statistics. The scheduler component allows for automated runs, enabling the collection of statistics at predefined intervals. The utility uses a command-line interface (CLI) for administration, with commands like `RUNSTATS`, `REPORT`, and `SCHEDULE`.

The RUNSTATS engine uses the Db2 API to gather statistics, and the collected data is stored within the Db2 catalog tables. The communication between components is primarily through the CLI and configuration files. Security is managed through Db2's security features, including role-based access control (RBAC).

The utility does not expose any specific APIs, but it can be integrated into existing workflows through scripting. The configuration files store settings such as connection parameters, scheduling information, and logging preferences. The utility does not use separate databases or storage mechanisms beyond the Db2 environment.

Frequently Asked Questions

What is CDB/Runstats and what does it do?

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CDB/Runstats is a utility designed to gather and update database statistics for Db2 on z/OS. It provides a method to collect detailed performance data outside of the standard Db2 RUNSTATS process. This data is then used by the Db2 optimizer to create efficient access plans for SQL queries.

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What are the primary benefits of using CDB/Runstats?

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CDB/Runstats offers several advantages, including the ability to gather more comprehensive statistics than the standard Db2 RUNSTATS, the capability to schedule statistics collection outside of peak hours, and the potential to improve query performance by providing the optimizer with more accurate data. It also allows for the collection of statistics on specific objects or subsets of data.

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How does CDB/Runstats differ from the built-in Db2 RUNSTATS utility?

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CDB/Runstats extends the functionality of the native Db2 RUNSTATS by providing additional options for data collection and analysis. It can gather more detailed statistics, offers more flexible scheduling capabilities, and allows for the collection of statistics on specific data subsets. This can lead to more precise query optimization and improved overall database performance.

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Is CDB/Runstats a replacement for the Db2 RUNSTATS utility?

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No, CDB/Runstats is not a replacement for Db2 RUNSTATS. It complements the built-in utility by offering enhanced capabilities. Both utilities can be used together to ensure that the Db2 optimizer has the most accurate and up-to-date statistics for query optimization.

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What are the most common commands used with CDB/Runstats?

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Common commands include the RUNSTATS command to collect statistics, the REPORT command to view collected statistics, the SCHEDULE command to set up automated runs, and the MODIFY command to adjust configuration settings. The utility also includes commands for managing the statistics catalog and for troubleshooting.

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What is the syntax for running a basic RUNSTATS operation?

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The basic syntax for the RUNSTATS command is: `RUNSTATS TABLESPACE TABLE `. This command collects statistics for the specified table within the specified tablespace. Additional parameters can be added to customize the statistics collection, such as specifying the sampling rate or the types of statistics to gather.

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What configuration files or interfaces are used by CDB/Runstats?

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CDB/Runstats uses configuration files to store settings such as connection parameters, scheduling information, and logging preferences. These files are typically text-based and can be edited using a text editor. The utility also provides a command-line interface (CLI) for interacting with the system and managing its operations.

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What databases or storage mechanisms are used?

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CDB/Runstats interacts directly with the Db2 catalog to store and retrieve statistical data. It does not use separate databases or storage mechanisms beyond the Db2 environment. The collected statistics are stored within the Db2 catalog tables, which are then used by the Db2 optimizer.

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How does CDB/Runstats improve query performance?

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CDB/Runstats improves query performance by providing the Db2 optimizer with more accurate and detailed statistics about the data. This allows the optimizer to create more efficient access plans, reducing the time it takes to retrieve data. The enhanced statistics help the optimizer make better decisions about index usage, join order, and other optimization strategies.

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What is the return on investment (ROI) of using CDB/Runstats?

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The ROI of CDB/Runstats can be significant, as improved query performance can lead to reduced CPU consumption, faster response times, and increased system throughput. This can result in cost savings, improved user satisfaction, and better utilization of existing hardware resources. The specific ROI depends on the workload and the degree of performance improvement achieved.

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How does CDB/Runstats help with capacity planning?

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By providing detailed performance statistics, CDB/Runstats assists in capacity planning by helping to identify performance bottlenecks and resource utilization trends. This information can be used to forecast future resource needs, optimize database configurations, and make informed decisions about hardware upgrades.

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How does CDB/Runstats contribute to overall database health?

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CDB/Runstats contributes to overall database health by ensuring that the Db2 optimizer has the necessary information to make optimal decisions. This leads to more stable and predictable performance, reduced resource consumption, and improved system responsiveness. Regular use of CDB/Runstats helps maintain a healthy and efficient database environment.

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What authentication methods are supported?

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CDB/Runstats leverages the security features of the underlying Db2 system. Authentication is handled through Db2's security mechanisms, which may include methods such as RACF or other security products integrated with z/OS.

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What access control model is used?

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CDB/Runstats relies on the access control model provided by Db2 and the underlying z/OS security infrastructure. This typically involves role-based access control (RBAC) and the assignment of privileges to users or groups to control access to database objects and utility functions.

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What audit/logging capabilities exist?

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CDB/Runstats integrates with Db2's auditing and logging features. All operations performed by CDB/Runstats are logged through Db2's audit trails, providing a record of actions taken, user identities, and timestamps. This allows for comprehensive monitoring and security analysis.

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Are there any specific security considerations when using CDB/Runstats?

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Security considerations include ensuring that only authorized users have access to the CDB/Runstats commands and configuration files. It is also important to regularly review the audit logs to detect any unauthorized activity. Following Db2 and z/OS security best practices is essential for maintaining a secure environment.

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How is CDB/Runstats installed and configured?

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CDB/Runstats is typically installed by copying the executable modules to a designated library and configuring the necessary Db2 connection parameters. Configuration involves setting up the connection to the Db2 subsystem, defining the tablespaces and tables to be analyzed, and setting up any scheduling preferences. Detailed installation instructions are provided in the product documentation.

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How are updates and maintenance handled?

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Updates and maintenance for CDB/Runstats are typically provided through updated executable modules. These updates are applied by replacing the existing modules in the designated library. Regular maintenance involves reviewing the configuration, monitoring performance, and adjusting settings as needed to optimize performance.

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What monitoring capabilities are available?

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CDB/Runstats provides monitoring capabilities through its reporting features and integration with Db2's monitoring tools. The REPORT command can be used to view the collected statistics and assess the performance of the database. Db2's monitoring tools can also be used to track resource usage and identify potential performance issues.

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How are errors and issues handled?

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CDB/Runstats logs errors and issues to a designated log file. Users can review the log file to identify and troubleshoot problems. The product documentation provides guidance on common error messages and their resolutions. Support channels are available for more complex issues.

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