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HCL Informix V14.10
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Informix®
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Informix®
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Informix®
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Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
System administration
These topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning
HCL Informix®
database servers.
Performance Guide
The
Informix® Performance Guide
describes how to configure and operate your
HCL Informix®
database server to improve overall system throughput and to improve the performance of SQL queries.
Performance monitoring and the tools you use
You can use performance monitoring tools to create a performance history, to monitor database resources at scheduled times, or to monitor ongoing transaction or query performance.
Monitor transactions
You can use the
onlog
and
onstat
utilities to monitor transactions.
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
System administration
These topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning
HCL Informix®
database servers.
List of utilities
HCL Informix®
includes utilities and applications that you can use to perform administrative tasks and capture information about configuration and performance.
Administrator's Guide
The
Informix® Administrator's Guide
provides the information required to administer
HCL Informix®
.
Administrator's Reference
The includes comprehensive descriptions of
HCL Informix®
configuration parameters, the system-monitoring interface (SMI) tables in the sysmaster database, the syntax of database server utilities such as
onmode
and
onstat
, logical-log records, disk structures, event alarms, and unnumbered error messages.
DB-Access User's Guide
The
Informix® DB-Access User's Guide
describes how to use the
DB-Access
utility to access, modify, and retrieve information from
Informix®
database servers.
High-Performance Loader User's Guide
The describes how to use the
HCL Informix®
to load and unload large quantities of data efficiently to or from
Informix®
databases.
Performance Guide
The
Informix® Performance Guide
describes how to configure and operate your
HCL Informix®
database server to improve overall system throughput and to improve the performance of SQL queries.
Performance basics
Performance measurement and tuning issues and methods are relevant to daily database server administration and query execution.
Performance monitoring and the tools you use
You can use performance monitoring tools to create a performance history, to monitor database resources at scheduled times, or to monitor ongoing transaction or query performance.
Evaluate the current configuration
Before you begin to adjust the configuration of your database server, evaluate the performance of your current configuration. You can view the contents of your configuration file with
onstat
commands.
Create a performance history
As soon as you set up your database server and begin to run applications on it, you should begin scheduled monitoring of resource use. As you accumulate data, you can analyze performance information.
Monitor database server resources
Monitor specific database server resources to identify performance bottlenecks and potential trouble spots and to improve resource use and response time.
Monitor transactions
You can use the
onlog
and
onstat
utilities to monitor transactions.
Using the onlog utility to monitor transactions
The
onlog
utility displays all or selected portions of the logical log. This utility can help you identify a problematic transaction or gauge transaction activity that corresponds to a period of high utilization, as indicated by your periodic snapshots of database activity and system-resource consumption.
Using the onstat utility to monitor transactions
If the throughput of transactions is not very high, you can use some
onstat
utility commands to identify a transaction that might be a bottleneck.
Monitor sessions and queries
Monitoring sessions and threads is important for sessions that perform queries as well as sessions that perform inserts, updates, and deletes. Some of the information that you can monitor for sessions and threads allows you to determine if an application is using a disproportionate amount of the resources.
Effect of configuration on CPU utilization
The combination of operating-system and
Informix®
configuration parameters can affect CPU utilization. You can change the settings of the
Informix®
configuration parameters that directly affect CPU utilization, and you can adjust the settings for different types of workloads.
Effect of configuration on memory utilization
The combination of operating-system and
Informix®
configuration parameters can affect memory utilization.
Effect of configuration on I/O activity
The configuration of your database server affects I/O activity.
Table performance considerations
Some performance issues are associated with unfragmented tables and table fragments.
Boosted Partition Free Space Caches (PFSC)
Indexes and index performance considerations
Informix®
provides several types of indexes. Some performance issues are associated with indexes.
Locking
The database server uses locks, which can affect concurrency and performance. You can monitor and administer locks.
Fragmentation guidelines
One of the most frequent causes of poor performance in relational database systems is contention for data that resides on a single I/O device. Proper fragmentation of high-use tables can significantly reduce I/O contention. These topics discuss the performance considerations that are involved when you use table fragmentation.
Queries and the query optimizer
These topics describe query plans, explain how the database server manages query optimization, and discuss factors that you can use to influence the query plan. These topics also describe performance considerations for SPL routines, the UDR cache, and triggers.
Optimizer directives
Optimizer directives
are comments that tell the query optimizer how to execute a query. You can use optimizer directives to improve query performance.
Parallel database query (PDQ)
You can manage how the database server performs PDQ and you can monitor the resources that the database server uses for PDQ.
Improving individual query performance
You can test, monitor, and improve queries.
Appendix
SNMP Subagent Guide
The describes the Simple Network Management Protocol (SNMP) and the software that you need to use SNMP to monitor and manage
HCL Informix®
database servers and databases.
InformixHQ Guide
InformixHQ is a modern web console for visualizing, monitoring, and managing your Informix server instances. It is purpose built for ease-of-use, scaling out, and optimizing DevOps needs. It provides critical performance management capabilities, monitoring how key performance metrics are changing over time and tracking how efficiently Informix is running your workload even when you’ve stepped away from your screen. Its monitoring system feeds directly into a customizable alerting system so you can be immediately alerted via email, Twilio, or PagerDuty whenever an issue occurs on one of your Informix database server instances. InformixHQ is designed to be scalable to efficiently manage and monitor as many Informix database server instances as you need. Moreover, it's a tool that can be shared by the DBAs, the app developers, the ops engineers, and management and accessed from any desktop, laptop, or mobile device. InformixHQ is the centralized hub for graphical monitoring, alerting, and administration of your Informix database servers.
Backup and Restore Guide
The
Informix® Backup and Restore Guide
describes how to use the
Informix®
ON-Bar
and
ontape
utilities to back up and restore database server data.
These utilities enable you to recover your databases after data is lost or becomes corrupted due to hardware or software failure or accident.
Enterprise Replication
The describes the concepts of data replication using
Informix® Enterprise Replication
, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.
Monitor transactions
You can use the
onlog
and
onstat
utilities to monitor transactions.
Using the onlog utility to monitor transactions
The
onlog
utility displays all or selected portions of the logical log. This utility can help you identify a problematic transaction or gauge transaction activity that corresponds to a period of high utilization, as indicated by your periodic snapshots of database activity and system-resource consumption.
Using the onstat utility to monitor transactions
If the throughput of transactions is not very high, you can use some
onstat
utility commands to identify a transaction that might be a bottleneck.
Related information
Evaluate the current configuration
Create a performance history
Monitor database server resources
Monitor sessions and queries
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