April 1999
Intermediate to advanced
552 pages
15h 39m
English
Content preview from Oracle Distributed Systems
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Chapter 10. Advanced Replication Installation
Many of the difficulties people experience with using advanced replication stem from incorrect or incomplete installations. Unfortunately, installation errors may go undetected until you have created and instantiated replication groups. But fortunately, it is possible to validate an installation before creating objects. If you carefully follow the instructions provided here, your installations should be successful.
Initialization Parameters
Several initializationparameters have a strong bearing on the performance and reliability of advanced replication. Table 10.1 summarizes these parameters.
Table 10-1. Initialization Parameters for Advanced Replication
Parameter Name | Default Value | Value Range | Remarks |
|---|---|---|---|
DISTRIBUTED_LOCK_TIMEOUT | 60 (seconds) | 60 ndash; 300 | The number of seconds that distributed transactions will wait for locked objects. The default may not be adequate for remote transactions to complete, particularly if you are on a slow network or a WAN. |
DISTRIBUTED_TRANSACTIONS | OS dependent; approximately TRANSACTIONS/4 | 0 ndash; TRANSACTIONS | The number of distributed transactions in which the database can participate at one time. If set to 0, no distributed transactions are allowed. Make sure it is set high enough to support your site’s activity. |
G LOBAL_NAMES | FALSE | TRUE or FALSE | Enforces global naming. It must be set to TRUE to use advanced replication. Even if you are not using advanced replication, TRUE is the recommended setting and may be required ... |
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