Create a static listener entry for the standby. Ideally, you would also be able to run multiple tests using the same workload and data. Remember that a connection between different socket sizes will always result in a connection of the lower number. This integration is not by chance. If you did have to set the transmit queue length to 10000, for example, you would use ifconfig: ifconfig eth0 txqueuelen 10000 For the receiver side, there is a similar queue for incoming packets.
Customizing Your Logical Standby Database or Creating a Local Dataset at the Logical Standby. At the bottom of the page see the next illustration is a place to specify the location of the network configuration files on the standby system. For example, here is the output from a ping going from Texas to New Hampshire about 1990 miles at night, when nothing else is going on edited a bit to make it fit on the page using 56 bytes and 64,000 bytes. However, events that have no impact on the availability of the primary database can impact its ability to transmit redo to the standby. Monitoring, tuning, and disaster recovery techniques are also covered in this comprehensive resource.
When we need to start or implement Oracle Data Guard. Later on in the process, you are told to do the same thing on the logical standby. Maximum Availability This mode emphasizes availability as its first priority and zero data loss protection as a very close second priority. Convert a physical standby database to a snapshot standby and begin capturing workload on your primary database. This book is written for implementer and goes far and beyond the Oracle Documentation. The redo copy latch is obtained, and, while holding the redo copy latch, the redo allocation latch is also obtained. Using Oracle Enterprise Manager Grid Control.
Step 1: Prepare the Standby System First we are going to make some more assumptions. So we need to configure for it now, not when it happens, because it will of course occur at 3 a. Manual effort is required because Data Guard is not yet able to coordinate point-in-time recovery across multiple databases participating in a distributed transaction. In addition, she has worked on a wide variety of projects in multi-platform environments. Each standby database has its own set of attributes and parameters. They fear that automatic failover may result in more data loss than acceptable, or that it may cause a split-brain condition, in which two primary databases each process transactions independent of the other. Now you are prepared for Chapter 2 and ready to begin adding to your knowledge of how to implement, manage, and get the most out of your Data Guard configuration.
More on that in Chapter 7. Your next step is to set up the standby system. Data Guard Configuration and Management Errors. The topic of configuring multiple standbys with different transport attributes is covered in Chapter 8 when we talk about choosing a standby database for a failover. The information is dense at times and sometimes I had to read over a section more than once to fully comprehend the material. The basic foundation of Data Guard centers around replication of changes.
At this point, since we have not yet started to create a standby database, we may not have installed the software at the standby server. With a basic understanding of Oracle database administration, you'll be able to easily follow the book. Manual failover operations give the administrator complete control of role transitions. Read Write Standby in Oracle Database 10g. In previous Data Guard releases, the database would have to be in the mount state when media recovery was active. No other method on the market offers the simplicity, transparency, and high performance of the Active Data Guard standby for maintaining a synchronized replica of a production database that is open read-only.
If you have increased the transmit queue length, it is considered a good idea to increase the receive queue as well. This architecture, along with significant Media Recovery enhancements in Oracle Database 11g, achieves very high performance. This can improve primary database performance and response time by offloading queries to an active standby database. The key difference between Data Guard and Active Data Guard is the state of the target database. This will restart the redo apply.
The next area of Data Guard architecture we will discuss is role management services that enable the rapid transition of a standby database to the primary database role. In this case, more really is better. This book is very timely given the significant enhancements in Data Guard 11g that revolutionize how users can leverage their standby databases for productive purposes while in standby role. Nevertheless, the mechanics of instance and crash recovery are the same. It actually takes about 75 percent fewer steps.