By storing the messages in the database, AQ provides a
solution with greater recoverability than other queuing solutions that store messages
in filesystems.
Oracle messaging adds the capability to develop and deploy a content-based publish
and subscribe solution using a rules engine to determine relevant subscribing applications.
As new content is published to a subscriber list, the rules on the list determine
which subscribers should receive the content. This approach means that a single list
can efficiently serve the needs of different subscriber communities. In the first release
of Oracle9i, AQ added XML support and Oracle Internet Directory (OID)
integration.
As of the second release of Oracle9i, AQ became part of Oracle Streams. Streams has
three major components: log-based replication for data capture, queuing for data
staging, and user-defined rules for data consumption. Since Oracle Database 10g,
Streams also includes support for change data capture and file transfer solutions.
Streams is managed through Oracle Enterprise Manager and described in more detail
in Chapter 13.
Pages:
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75