Welcome
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
Enterprise Replication
The describes the concepts of data replication using HCL Informix® Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.
Appendixes
configuration parameter and environment variable reference
You can use configuration parameters and environment variables to configure the behavior of .
CDR_MAX_DYNAMIC_LOGS Configuration Parameter
Specifies the number of dynamic log file requests that can make in one server session.

HCL Informix® V15.0.0 documentation
Welcome to the documentation for HCL Informix® 15.0.0 and related client tools and products.
Product overview
HCL Informix® is a fast and scalable database server that manages traditional relational, object-relational, and dimensional databases. Its small footprint and self-managing capabilities are suited to embedded data-management solutions.
Installing
These topics describe how to install HCL Informix® database servers, client products, and modules.
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.
- Backup and Restore Guide
  The HCL® Informix® Backup and Restore Guide describes how to use the HCL Informix 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 HCL Informix® Enterprise Replication, including how to design your replication system, as well as administer and manage data replication throughout your enterprise.
  - About Enterprise Replication
    HCL Informix® Enterprise Replication generates and manages multiple copies of data at one or more sites, which allows an enterprise to share corporate data throughout its organization.
  - Planning and designing for Enterprise Replication
    Before you set up your replication system, plan how to include Enterprise Replication into your database server environment, design your database schema by following Enterprise Replication requirements, and then design your replication system between database servers.
  - Setting up and managing Enterprise Replication
    After you design your replication system, you define it and start replication.
  - Push data feature
  - Loopback replication
  - Appendixes
    - The cdr utility
      You use the cdr utility to configure and control from the command line on your UNIX™ or Windows™ operating system.
    - configuration parameter and environment variable reference
      You can use configuration parameters and environment variables to configure the behavior of .
      - CDR_APPLY Configuration Parameter
        Specifies the minimum and maximum number of data sync threads. The value is updated dynamically as needed.
      - CDR_AUTO_DISCOVER configuration parameter
        Use the CDR_AUTO_DISCOVER configuration parameter to enable connectivity autoconfiguration for a high-availability cluster or Enterprise Replication domain, or to autoconfigure replication.
      - CDR_DBSPACE Configuration Parameter
        Specifies the dbspace where the syscdr database is created.
      - CDR_DELAY_PURGE_DTC configuration parameter
        Specifies how long to retain rows in delete tables to support the delete wins conflict resolution rule.
      - CDR_DSLOCKWAIT Configuration Parameter
        Specifies the number of seconds the data sync component waits for the database locks to be released.
      - CDR_ENV Configuration Parameter
        Sets the environment variables CDR_ALARMS, CDR_LOGDELTA, CDR_PERFLOG, CDR_ROUTER, or CDR_RMSCALEFACT.
      - CDR_EVALTHREADS Configuration Parameter
        Specifies the number of group evaluator threads to create when starts, and enables parallelism.
      - CDR_LOG_LAG_ACTION configuration parameter
        Specifies how responds to a potential log wrap situation.
      - CDR_LOG_STAGING_MAXSIZE Configuration Parameter
        Specifies the maximum amount of space that Enterprise Replication uses to stage compressed log files in the directory specified by the LOG_STAGING_DIR configuration parameter.
      - CDR_MAX_DYNAMIC_LOGS Configuration Parameter
        Specifies the number of dynamic log file requests that can make in one server session.
      - CDR_MAX_FLUSH_SIZE configuration parameter
        Specifies the maximum number of replicated transactions that are applied before the logs are flushed.
      - CDR_MEM configuration parameter
        The CDR_MEM configuration parameter is used to specify Enterprise Replication's method for memory-pool allocation.
      - CDR_NIFCOMPRESS Configuration Parameter
        Specifies the level of compression the database server uses before sending data from the source database server to the target database server.
      - CDR_QDATA_SBSPACE Configuration Parameter
        Specifies the list of up to 32 names of sbspaces that uses to store spooled transaction row data.
      - CDR_QUEUEMEM Configuration Parameter
        Specifies the maximum amount of memory that is used for the send and receive queues.
      - CDR_SERIAL Configuration Parameter
        Enables control over generating values for serial columns in tables that are defined for replication.
      - CDR_SUPPRESS_ATSRISWARN Configuration Parameter
        Specifies the data sync error and warning code numbers to be suppressed in ATS and RIS files.
      - CDR_TSINSTANCEID configuration parameter
        Specifies how to generate unique identifiers for time series instances across replication servers. If a replicate includes a column with a TimeSeries column, the CDR_TSINSTANCEID configuration parameter must be set to a different value on every participating replication server before you create any time series instances.
      - ENCRYPT_CDR Configuration Parameter
        Use the ENCRYPT_CDR configuration parameter to set the level of encryption for .
      - ENCRYPT_SMX Configuration Parameter
        Use the ENCRYPT_SMX configuration parameter to set the level of encryption for high-availability configurations on secondary servers and between Enterprise Replication servers.
      - GRIDCOPY_DIR Configuration Parameter
        Specifies the default directory used by the ifx_grid_copy procedure.
      - SHARD_EDGE_NODE configuration parameter
      - SHARD_ID configuration parameter
        Sets the unique ID for a shard server in a shard cluster.
      - SMX_COMPRESS Configuration Parameter
        Use the SMX_COMPRESS configuration parameter to specify the level of compression that the database server uses before sending data from the source database server to the target database server.
      - SMX_NUMPIPES Configuration Parameter
        The SMX_NUMPIPES configuration parameter sets the number of pipes for server multiplexer group (SMX) connections.
      - CDR_ALARMS Environment Variable
        Enables event alarms.
      - CDR_ATSRISNAME_DELIM Environment Variable
        Specifies the delimiter to use to separate the parts of the time portion of ATS and RIS file names that are in text format.
      - CDR_DISABLE_SPOOL Environment Variable
        Controls the generation of ATS and RIS files.
      - CDR_LOGDELTA Environment Variable
        Determines when the send and receive queues are spooled to disk as a percentage of the logical log size.
      - CDR_PERFLOG Environment Variable
        Enables queue tracing.
      - CDR_RMSCALEFACT Environment Variable
        Sets the number of data sync threads started for each CPU VP.
      - CDR_ROUTER Environment Variable
        Disables intermediate acknowledgments of transactions in the hierarchical topologies.
    - Grid routines
      Grid routines are used to create and maintain the grid and to administer servers in the grid by propagating commands from a source server to all other servers in the grid.
    - Enterprise Replication routines
      Enterprise Replication routines used to control if a replicated transaction is recaptured.
    - onstat -g commands for Enterprise Replication
      You can monitor and debug Enterprise Replication activity using onstat -g commands.
    - syscdr Tables
      These tables in the syscdr database contain progress information about consistency checking and synchronization operations.
    - SMI Table Reference
      The system-monitoring interface (SMI) tables in the sysmaster database provide information about the state of the database server. Enterprise Replication uses the following SMI tables.
    - Replication Examples
      This appendix contains simple examples of replication using the command-line utility (CLU).
    - Data sync warning and error messages
      Data sync warning and error messages describe problems with replicated transactions.
Migrating and upgrading
You can upgrade to the 15.0.0 release of HCL Informix® or migrate from other database servers to Informix. Upgrading is an in-place migration method that uses your existing hardware and operating system software. Some changes to the Informix database server can affect upgrading from a previous release.
Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
Embedding Informix®
When you embed HCL Informix®, you can use enterprise-class high-availability and high performance with embeddability features such as easy programmability, a small disk and memory footprint, and silent deployment.
Extending Informix®
Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix includes many built-in extensions that are fully integrated in the database server. Informix also provides modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix.
Data warehousing
In addition to designing and implementing Informix® dimensional databases, you can use tools to create data warehouse applications and optimize your data warehouse queries.
Designing databases
The first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
JSON compatibility
You can use the popular JSON-oriented query language created by MongoDB to interact with data stored in HCL Informix®.
Security
You can secure your Informix® database server and the data that is stored in your Informix databases. You can encrypt data, secure connections, control user privileges and access, and audit data security.
SQL programming
You can use the HCL Informix® implementation of the SQL language to develop applications for Informix database servers.
Troubleshooting HCL Informix®
Several troubleshooting techniques, tools, and resources are available for resolving problems that you encounter in your HCL Informix® database server environment.

CDR_MAX_DYNAMIC_LOGS Configuration Parameter

Specifies the number of dynamic log file requests that can make in one server session.

onconfig.std value

0

range of values

-1 add dynamic log files indefinitely
0 disable dynamic log addition
>0 number of dynamic logs that can be added

takes effect

when the database server is shut down and restarted, and the DYNAMIC_LOGS configuration parameter is set to 2 or when the cdr change onconfig command is used. For more information on the DYNAMIC_LOGS configuration parameter, see the HCL® Informix® Administrator's Reference.

The CDR_MAX_DYNAMIC_LOGS configuration parameter specifies the number of dynamic log file requests that Enterprise Replication can make in one server session. The DYNAMIC_LOGS configuration parameter must be set to 2.