Release 10.1C: OpenEdge Replication:
User Guide
Source and target architecture requirements
Before OpenEdge Replication starts, the source and target databases are automatically checked to ensure that the databases are identical in the following ways:
- The logical structure—but not necessarily the physical structure—of the databases. (All user-defined areas must be identical except the AI areas.)
- The versions of the databases.
- The database block sizes.
- If large file support is enabled, it must be enabled on both databases.
- Before-Image (BI) block sizes.
Once OpenEdge Replication is configured and running, it will propagate any source database changes to the target database. For OpenEdge Replication to function properly, follow these source and target database guidelines:
- For safety, the target database should reside on a different machine than the source.
- Both the source and the target machines must have the same endian ordering, which is the way the multiple byte integers are stored in memory—either by MSB (most-significant byte) or LSB (least-significant byte). Those systems storing by MSB are called Big Endian, and those storing by LSB are called Little Endian.
The term endianess is used in general to describe when binary files are portable between platforms; those platforms with the same endianess may use binary data transparently. Typically, UNIX machines and Windows machines use different endian ordering for storage. Therefore, a Windows source database can be replicated to another Windows machine, but not to an HPUX machine. An HPUX source database can be replicated to another HPUX machine.
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