Troubleshooting guide

can have only one database connection in Replication Server. See also Replication Server
and route .
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data client – a client application that provides access to data by connecting to a data server.
See also client , client application , and data server .
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data distribution – a method of locating (or placing) discrete parts of a single set of data in
multiple systems or at multiple sites. Data distribution is distinct from data replication,
although a data replication system can be used to implement or support data distribution.
Contrast with data replication .
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data replication – the process of copying primary data to remote locations and
synchronizing the copied data with the primary data. Data replication is different from data
distribution. Replicated data is a stored copy of data at one or more remote sites throughout
a system, and it is not necessarily distributed data. Contrast with data distribution . See also
transaction replication .
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data server – a server that provides the functionality necessary to maintain the physical
representation of a table in a database. Data servers are usually database servers, but they
can also be any data repository with the interface and functionality a data client requires.
See also
client , client application , and data client .
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datatype – a keyword that identifies the characteristics of stored information on a
computer. Some common datatypes are: char , int , smallint , date , time , numeric , and float .
Different data servers support different datatypes.
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DBMS – an abbreviation for database management system, a computer-based system for
defining, creating, manipulating, controlling, managing, and using databases. The DBMS
can include the user interface for using the database, or it can be a standalone data server
system. Compare with RDBMS .
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ERSSD – an abbreviation for Embedded Replication Server System Database, which
manages replication system information for a Replication Server. See also Replication
Server .
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failback – a procedure that restores the normal user and client access to a primary
database, after a failover procedure switches access from the primary database to a
replicate database. See also
failover .
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failover – a procedure that switches user and client access from a primary database to a
replicate database, particularly in the event of a failure that interrupts operations at the
primary database, or access to the primary database. Failover is an important fault-
tolerance feature for systems that require high availability. See also failback .
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function – a data server object that represents an operation or set of operations.
Replication Server distributes operations to replicate databases as functions. See also
stored procedure .
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function string – a string that Replication Server uses to map a function and its parameters
to a data server API. Function strings allow Replication Server to support heterogeneous
replication, in which the primary and replicate databases are different types, with different
SQL extensions and different command features. See also function .
CHAPTER 7: Glossary
106 Replication Server