Welcome
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
Backup and Restore Guide
These topics describe how to use the HCL® 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.
Backup and restore configuration parameter reference
Backup and restore configuration parameters
These topics describe the configuration parameters that you use with the ON-Bar, ontape, and archecker utilities.
The archecker utility configuration parameters and environment variable
These topics describe the AC_CONFIG environment variable and the configuration parameters that you use with the archecker utility.
AC_MAX_RESTORE configuration parameter
Use the AC_MAX_RESTORE configuration parameter to specify the number of processes to be started during a parallel table level restore using archecker. Each process will perform physical restore of a table from a dbspace.

HCL Informix® V15.0 documentation
Welcome to the documentation for HCL Informix® 15.0 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 DataBlade® 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
  These topics describe how to use the HCL® 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.
  - Overview of backup and restore
    These topics provide an overview of backup and restore concepts. They also provide information about planning for backup and restore operations.
  - ON-Bar backup and restore system
  - ontape backup and restore system
  - Backup and restore a Remote Secondary Server(RSS)
  - Integrated Backup Encryption
    These topics provide information about Integrated Backup Encryption.
  - HCL Informix® Primary Storage Manager
    HCL Informix® Primary Storage Manager is an application that manages storage devices used for backup and restore requests that are issued by ON-Bar. This storage manager supports both serial and parallel processing for backup and restore requests.
  - archecker table level restore utility
  - Backup and restore configuration parameter reference
    - Backup and restore configuration parameters
      These topics describe the configuration parameters that you use with the ON-Bar, ontape, and archecker utilities.
      - ON-Bar and ontape configuration parameters and environment variable
        Many properties of the ON-Bar and ontape utilities are controlled by configuration parameters in the onconfig file. ON-Bar also has an environment variable.
      - The archecker utility configuration parameters and environment variable
        These topics describe the AC_CONFIG environment variable and the configuration parameters that you use with the archecker utility.
        AC_CONFIG file environment variable
        Set the AC_CONFIG environment variable to the full path name for the archecker configuration file (either ac_config.std or user defined).
        AC_DBSPACE configuration parameter
        Use the AC_DBSPACE parameter in the AC_CONFIG file to specify a list of dbspaces that the archecker utility will verify during a backup verification process.
        AC_DEBUG configuration parameter
        The AC_DEBUG configuration parameter causes debugging messages to be printed in the archecker message file. Use this parameter only as directed by technical support.
        AC_IXBAR configuration parameter
        Use the AC_IXBAR configuration parameter to specify the location of the IXBAR file.
        AC_LTAPEBLOCK configuration parameter
        Use the AC_LTAPEBLOCK configuration parameter to the ontape block size for reading logical logs.
        AC_LTAPEDEV parameter
        Use the AC_LTAPEDEV configuration parameter to specify the local device name that is used by the ontape utility.
        AC_MAX_RESTORE configuration parameter
        Use the AC_MAX_RESTORE configuration parameter to specify the number of processes to be started during a parallel table level restore using archecker. Each process will perform physical restore of a table from a dbspace.
        AC_MSGPATH configuration parameter
        Use the AC_MSGPATH parameter in the AC_CONFIG file to specify the location of the archecker message log (ac_msg.log).
        AC_SCHEMA configuration parameter
        Use the AC_SCHEMA configuration parameter to specify the path name to the archecker schema command file.
        AC_STORAGE configuration parameter
        Use the AC_STORAGE configuration parameter in the AC_CONFIG file to specify the location of the directory where archecker stores its temporary files.
        AC_TAPEBLOCK configuration parameter
        Use the AC_TAPEBLOCK configuration parameter to specify the size of the tape block in kilobytes when an archive is performed either the onbar -b command or the ontape -t command.
        AC_TAPEDEV configuration parameter
        Use the AC_TAPEDEV configuration parameter to specify the local device name that is used by the ontape utility.
        AC_TIMEOUT configuration parameter
        Use the AC_TIMEOUT configuration parameter to specify the timeout value for the onbar and the archecker processes if one of them exits prematurely.
        AC_VERBOSE configuration parameter
        Use the AC_VERBOSE parameter in the AC_CONFIG file to specify either verbose or terse output in the archecker message log (ac_msg.log).
      - Informix® Primary Storage Manager configuration parameters
        The HCL Informix® Primary Storage Manager uses the information in some specific configuration parameters.
      - Event alarm configuration parameters
        When you set configuration parameters for use with the ON-Bar and ontape utilities, also determine if you need to adjust the ALARMPROGRAM and ALRM_ALL_EVENTS configuration parameters.
  - Cloud Backup
    These topics provide information about storing and retrieving the backups directly to the ecosystem of selected cloud providers, namely Amazon S3 and Softlayer Object Storage.
  - Appendixes
- Enterprise Replication
  These topics describe 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.
Migrating and upgrading
You can upgrade to the 15.0 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 DataBlade® 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.

AC_MAX_RESTORE configuration parameter

Use the AC_MAX_RESTORE configuration parameter to specify the number of processes to be started during a parallel table level restore using archecker. Each process will perform physical restore of a table from a dbspace.

Default value: 1

Starting with Informix server version 15.0.1.x, while restoring a table from level 0 backup, instead of processing dbspaces serially, archecker will create one dedicated process per dbspace provided in AC_DBSPACE. The individual processes will read pages from L0 backup from storage manager, find the table in the dbspace and will then restore the backed up rows. AC_MAX_RESTORE is introduced to control the number of processes to be created.

Note: Parallel physical table level restore is not supported on Windows platform.

If verbose mode is set to print logs on console, then each process will print the logs related to the number of rows it processed. Also, each process will create a message log file based on the AC_MSGPATH configuration parameter value, the file will have a <pid> as extension. For example, if AC_MSGPATH is set to /tmp/msg_file.log, then the corresponding process message file will be /tmp/msg_file.log.<process ID>.