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Progress DBA ADMIN - Absolute-path Databases
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Progress DBA ADMIN - Absolute-path Databases

An absolute-path database is used in most production situations. With an absolute-path
database, extents associated with the database can be stored anywhere on the system. The
control area contains absolute paths to each extent. Absolute-path databases should not be
copied using OS tools; rather, PROBKUP and PROCOPY should be used so that all underlying
files are properly backed up or copied.

Posted on: 12/26 15:09
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Progress DBA ADMIN - Relative-path Database Creation
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Progress DBA ADMIN - Relative-path Database Creation


Schema must be loaded into an empty relative-path database to make it useful. Any standard
technique for loading schema, such as a dump and load or by using PROCOPY, can be used.
The database maintains its relative-path as long as its structure is not changed. As soon as areas
or extents are added, the database becomes an absolute-path database.

Posted on: 2016/8/26 16:33
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Progress DBA ADMIN - Relative-path Databases
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Progress DBA ADMIN - Relative-path Databases



Relative-path databases are the simplest form of Version 9 databases. They contain most of the
properties associated with pre-Version 9 (single volume) databases, in that they are made up of
a minimum number of files and can be copied with OS commands. A relative-path database
stores all extents associated with the database in the same directory as the control area. The
control area contains relative paths to all the extents. You would use a relative-path database in
the following situations:
• When the database needs to be opened across a network for demonstration purposes
• When the database needs to be copied with OS tools, as when installing a demonstration
database
• When the database is the master database to be associated with a new application

Posted on: 2016/7/17 21:48
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Progress DBA ADMIN - Shared Memory
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Progress DBA ADMIN - Shared Memory


Shared memory is an area in system memory that multiple users can access concurrently. You
might have to adjust the maximum shared-memory segment size and the total number of
available segments to improve system performance.

Posted on: 2016/6/10 15:40
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Progress DBA ADMIN - Processes
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Progress DBA ADMIN - Processes

Brokers, servers, clients, and background writers run as processes. Processes implement the
client, the server, or the functions for both on a node. Processes also coordinate communication
among nodes, and provide operating system and application services for the node. A kernel or
system parameter in the operating system limits the number of active processes that can run on
a system. You might have to raise the parameter to allow for more processes.

Posted on: 2016/5/14 21:09
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Progress DBA ADMIN - File Descriptors
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Progress DBA ADMIN - File Descriptors


A file descriptor is an identifier assigned to a file when it is opened. There is a system limit on
the number of file descriptors. Each database process (clients, remote client servers, and the
broker) uses several file descriptors. You might have to adjust the system

Posted on: 2016/4/6 21:45
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Progress DBA ADMIN - Spin Locks
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Progress DBA ADMIN - Spin Locks


The database engine uses a spin lock algorithm to control access to shared-memory structures.
You can control how the database engine uses spin locks with the Spin Lock Retries (-spin)
startup parameter.

Posted on: 2016/3/16 21:30
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Progress DBA ADMIN - Multi-user Mode
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Progress DBA ADMIN - Multi-user Mode


A database running in multi-user mode enables more than one user to access it simultaneously.
A broker coordinates all the database requests from all the users using a single database. For
example, the broker process locks the database to prevent any other broker or single-user
process from opening it. Also, all users must request access from the broker to connect to the
database.

Posted on: 2016/3/2 20:54
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Progress DBA ADMIN - Single-user Mode
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Progress DBA ADMIN - Single-user Mode


A database running in single-user mode allows one user to access a specified database at a time.
If another user is already accessing a database, you cannot connect to that database from a
different Progress session. The database engine uses a lock file (.lk) to lock out other users.
Running a database in single-user mode is helpful when you perform system administration
tasks that require exclusive access to the database.

Posted on: 2016/2/16 17:11
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Progress DBA ADMIN - Connection Modes
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Progress DBA ADMIN - Connection Modes


Progress databases run in one of two connection modes: single-user or multi-user. Connection
modes control how many users can access a database simultaneously

Posted on: 2016/1/29 22:07
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