Does oracle11grac use the Rexec service?

Oracle 12C: What's New - Enhancements to the RAC database.

what-if command evaluation.

With the new what-if command evaluation option via srvctl, it is now possible to determine the impact of running this command. This new addition to srvctl allows it to be emulated without actually executing or making any changes to the current system. This is especially useful when you want to make changes to an existing system but are uncertain about the outcome.

For example, if you want to know what happens when you stop a particular database, then you can use the following example:

srvctl stop database –d mydb –eval

crsctl eval modify resource -attr “value”

Improvements to SRVCTL.

There are also some new features for the srvctl command. The following shows how to use these new features to stop or start a database or instance resource on a cluster.

srvctl start database|instance –startoption nomount|mount|open

Oracle: Database Brand.

11g: database version.

rac: cluster.

has: High Availability Service

Oracle 11G's Cluster High Availability Service.

Not on the cluster, but on the database itself.

Every time we shut down a database, especially a large database, we are most worried about whether we can get up, which sounds ridiculous, because in the process of shutting down, if there is a problem in one link, resulting in inconsistent file content, then it may not be able to get up. And the larger the database, the longer it will take to shut down and the more likely it will be to make mistakes. Not to mention shutting down the server directly.

Suppose a transaction is being processed on one of them, it has been processed, it is about to be written to disk, and you happen to shut down the server, then the best result is that the transaction is gone, and the worst result is that the database consistency is broken, that is, the checkpoints of the two cluster databases are inconsistent, then you can only hehe. It's not necessarily that it can't be recovered, but it may take time, and the effect of recovery is really not guaranteed.

I think 3 is better, 2 are nodes, and one is a scan IP server.

At least one server (dual network cards) + shared storage Two servers are recommended.

Let's take a look at the reason for analyzing the cluster logs.

In general, it may be that the cluster registry is not found, this situation is generally a problem with shared storage, there may be a change in the drive letter, there is no raw on the bare device you made, etc.

Most domestic enterprises are still useless and not necessary.

11g RAC will not have any problems following this outfit.

You run the command lsnrctl status on the operating system to check the listening status and output some information.

You can see a file called it, which is the log of the listener, and you can find it by following the path.

Depending on the version, the name may also change, and the 12c one is called.

The listening logs and warning logs of Oracle 11g are located in the u01 oracle diag tnslsnr oracle listener directory and u01 oracle diag rdbms db1 db1 directory, listener directory and db1 directory. In both directories, there are the following directories: alert cdump hm incident incpkg ir lck metadata stage sweep t....