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Figure 27-20 Include witness server.
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Log Shipping and Database Mirroring
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5. Because we are already on the principal server, the option is grayed out, and we need to select the server that will be the mirror as shown in Figure 27-21. Select the Mirror Server Instance checkbox, and then click the Next button.
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Figure 27-21 Server instance selection.
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6. The next two pages ask for information about the principal and mirror server instances. This information is used to configure the endpoints. As discussed earlier, the endpoints are the ports to which SQL Server will listen when exchanging information. Specifically with mirroring, these are the ports in which the principal server sends over the log records to be applied to the mirror server and the acknowledgement of the application confirmed back to the principal. The following screens ask you to select the listener ports (default is 5022), whether the data transmitted is to be encrypted (default is yes), the name of the mirror server, and the name of the endpoint on each server itself, as shown in Figure 27-22, for the principal server.
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Figure 27-22 Principal server port and security configuration.
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Part VI
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Make sure your various firewalls have port 5022 open or else communication between the servers will not be available for mirroring. Note that SQL Server s normal port for other communications is different than 5022, so just because you can run T-SQL against SQL Server does not ensure that mirroring will be available as well.
7. Repeat this for the mirror server as shown in Figure 27-23.
Figure 27-23 Mirror server port and security configuration.
8. If different account names are used, then supply them in the screen shown in Figure 27-24. If the servers use the same domain account and password or the same user account and password on the local servers, then you can leave the information blank and click the Next button.
Figure 27-24 Service account configuration.
27
Log Shipping and Database Mirroring
9. At this point, all of the information for configuration of the endpoints and security has been defined. The Complete The Wizard screen gives an overview of all of the various data input (not shown). Click the Finish button. 10. If everything is set up correctly and the services can communicate properly, SQL Server establishes the endpoints on both the principal and mirror servers, as seen in Figure 27-25.
Figure 27-25 Successful endpoint configuration.
11. The following two windows after the endpoint configuration announce that mirroring has been configured but has not started. The Database Properties window for the database now shows that the Server network addresses show the principal and mirror configured and listening on TCP port 5022 as shown in Figure 27-26. 12. Prior to starting database mirroring, the mirror server must have a copy of the principal s database in a recovery state. If the database has been restored and is in a recovery state, then start mirroring in this pair by clicking the Start Mirroring button. Note
Prior to starting the mirror, make sure the database has been restored on the mirror. Additionally, make sure that at least one transaction log has been applied there, too.
Part VI
High Availability
Figure 27-26 Database Properties window showing mirror definition populated.
If you do not have a database in recovery state on the mirror, you get an error instructing you to restore the principal database. The following scripts illustrate how to properly restore a database and transaction log and leave it in recovery state. This then allows you to click the Start Mirroring button and mirroring to start successfully. The following script restores the database from a backup from the principal database s server share. Please note the final clause, NORECOVERY. This keeps the database closed so that the transaction log can be applied:
RESTORE DATABASE prod FROM DISK = '\\srvbox000fm\h$\sql\backup\prod_mirror.bak' WITH MOVE 'data_file' TO 'c:\sql\data\data_file.mdf', MOVE 'log_file' TO 'c:\sql\log\log_file.ldf', NORECOVERY;
For mirroring to be properly initialized, one transaction log has to be applied to the mirror database. The following script applies one log, and as with the RESTORE, it leaves the database in NORECOVERY mode so that when mirroring is started, the log records from the principal can be applied properly.
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