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Generating the Mimer SQL System Databanks

The Mimer SQL system databanks SYSDB, TRANSDB, LOGDB and SQLDB are generated by the SDBGEN program.

SDBGEN will load the system tables, see Data Dictionary Tables, and defines the data dictionary views detailed in the Mimer SQL Reference Manual.

Note: A databank created for one SYSDB cannot be accessed by using a different SYSDB even if identical data dictionary definitions are created in it.

Setting the Initial Size

The initial size for each of the Mimer SQL system databanks can be specified.

The size for the databanks is specified in Mimer SQL pages. The size of a Mimer SQL page is 2 kilobytes.

Setting Password for System Administrator

The database administration ident SYSADM is also created and a password (passwords are case-sensitive) must be specified for this ident.

For security reasons, the password specified for SYSADM is not echoed on the screen when it is entered. It should be chosen carefully and changed at appropriate intervals using Mimer SQL with the ALTER IDENT statement.

Caution: Care should be taken to safeguard the SYSADM password, because if it is lost it cannot be retrieved from the system and it is not possible to set a new one.

UNIX: A local database is set up on a UNIX node by running the dbinstall command (see the dbinstall man-page) and SDBGEN is started automatically when required.
The databank files are by default created in the database home directory which is not the ideal arrangement from a security and performance point of view, see Re-creating TRANSDB, LOGDB and SQLDB for guidelines relating to placement and organization.
If there is more than one disk available on the system, it is recommended that directories be created on those disks specifically for locating databanks. When created, the LOCAL definition for the database should be updated in the
/etc/sqlhosts file by changing the single home directory path to a directory path list that includes these directories. The list is colon separated as can be seen in the following example:
hotel /usr/db/hotel:/extra/db/hotel:/extra2/db/hotel
After this update is made, the database server can be stopped and the selected databank files can be moved from the database home directory to their new locations. When moved, the database server can be started again.

VMS: In order to create the Mimer SQL system databanks for a local database on an OpenVMS node, an entry for the database must be specified in the SQLHOSTS file. SDBGEN should then be executed to create the actual database. See SDBGEN Syntax for information on how to run SDBGEN.

Win: You set up a local database on a Windows node by running the Mimer Administrator. The Mimer Administrator invokes the SDBGEN program in order to create the system databanks when required.
The system databanks are distributed automatically, depending on the number of disks available. On-line Windows help is provided with both the Mimer Administrator and SDBGEN to guide you through setting up a local database.


UNIX: On UNIX, the dbinstall utility is used to create the system databanks.

Win: On Windows, the Mimer Administrator is used to create the system databanks.

The SDBGEN command has two purposes. Either to create a new set of system databank files, or to upgrade database files created in an earlier version of Mimer SQL to version 9.2.

The SDBGEN program is controlled by flagged information specified on the command-line.

The syntax (expressed in VMS-style) for creating databank files is as follows:

 SDBGEN [/PASSWORD=passw] [dbase] [syssz] [tfn] [tsz] [lfn] [lsz] [sfn] [ssz]

sdbgen Command-line Arguments

When creating databanks files:

 -p password
Password for SYSADM
Database name
Size of SYSDB
Filename for TRANSDB
Filename for LOGDB
Size of LOGDB
Filename for SQLDB
Size of SQLDB

If the password parameter is omitted, the SDBGEN command will prompt for all parameters that are missing, including the password for the SYSADM user.

If the password parameter is given, the SDBGEN command will not prompt for any missing parameters, but use default values.

If the dbase parameter is missing, the environment variable MIMER_DATABASE is used to determine which database the databank files should be created for.

The SDBGEN program syntax (expressed in VMS-style) for upgrading databank files to Mimer SQL version 9.2 is as follows:


Establishing the Ident and Data Structure

Once the local database environment has been created for a Mimer SQL database (database name, server parameters, system databanks, the SYSADM ident plus the system tables and views), the data structure for the database (idents, user databanks, tables, and so on) can be created using Mimer SQL data definition statements.

Mimer BSQL allows the execution of a sequential file which can then be used as a permanent record of the CREATE statements used to create the database objects, see the Mimer SQL User's Manual, Mimer BSQL.

Mimer BSQL also supports the saving of input and/or output to a log file (using the LOG command), so this facility could be used to create a permanent record of an interactive Mimer BSQL session which could be run again at a later date. Mimer BSQL, however, only has limited support for error handling.

An application program using embedded SQL (ESQL), JDBC or ODBC can also be used, but this requires more work on the part of the programmer and it provides a less concise record of the ident and data structure in the database.

Third party SQL tools are also available which may be used to create the database data structure.

Caution: A sequential file intended for non-interactive execution in Mimer BSQL can include user name and password information relating to any CONNECT statements used. For security reasons, such a file should be well protected in the operating system, preferably with any user name and password edited out of any permanent copy of the file.

The Example Database

An example database is delivered with Mimer SQL. It is owned by the ident MIMER_STORE and contains various objects to be able to describe and demonstrate functionality in Mimer SQL. For details about the example database see the feature description `The Example Database' on the Mimer SQL developer site,

The example database is based on a store that sells music and books, available in various formats, for example a music album may be available in Audio CD, Cassette, DVD Audio, and Vinyl. The store also has a web site, through which users can place orders. SQL stored procedures (SQL/PSM) support various aspects of the business logic.

The example database forms as the basis for examples given in the Mimer SQL documentation Set

UNIX: On UNIX, the dbinstall utility, used to create the system databanks, provides an option to create the example database
Win: On Windows, the Mimer Administrator is used to create the system databanks. The wizard used for this provides an option to create the example database.

The example database can be created manually by using the exload program, described in the next section.

The exload program

By using the exload program the example database can be created or removed. (The example database can also be removed by dropping the MIMER_STORE ident from any SQL command tool).

When the example database is installed default values are provided for passwords on idents and for databank file names. These default values can be changed by using the ALTER command after the installation is completed or by explicitly give names as command line arguments to the exload command, see the exload syntax below.

The exload syntax

The exload syntax (expressed in Unix-style) files is as follows:

 usage:exload [-s|-m] [-f|-r] [-p SYSADM-password] [database]
        -s         Single-user mode database access
        -m         Multi-user mode database access
        -f         Forced install (overwrites existing environment)
        -r         Remove the example environment
        -p passw   Password for SYSADM
        database   Name of database to access
        When creating the example database it is possible to change the default
        values for passwords and filenames. This is done by adding parameters
        after the 'database' parameter (that must be given in this case).
        These optional parameters must be added in the following order:

Exload Command-line Arguments

Single-user mode database access
Multi-user mode database access
Remove the example database
Install the example database even if it already exists. The old environment is dropped.
 -p SYSADM-pwd
Password for SYSADM
Database name
Password for MIMER_STORE ident
Password for MIMER_ADM ident
Password for MIMER_USR ident
Password for MIMER_WEB ident
Filename for MIMER_STORE databank
Filename for MIMER_ORDERS databank
Filename for MIMER_BLOBS databank

All parameters to exload are optional.

If no command line arguments are given when using exload, the following will happen:

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