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Note that in the Windows examples, before launching SQL*Plus there is a set command. This is to nominate which database instance to connect to. There might be many instances (running or not) on any one machine; SQL*Plus needs to know which one you want to connect to so that it knows which parameter file to read. Setting the ORACLE_SID environment variable (you will need to export it on UNIX) avoids any possible confusion; you should always set this variable, probably in an operating system login script, especially if you have more than one database on one server. Having acquired a privileged connection, you can issue startup or shutdown commands. There are variations possible for the startup command, but these are only used when doing maintenance work. For normal usage, a simple startup will do, as shown in Figure 5-3, issued from the graphical version of SQL*Plus after connecting with operating system authentication. There are variations in the shutdown command. Without any argument, shutdown will wait until all users have voluntarily disconnected. This is not going to happen in an Oracle Collaboration Suite environment; there will always be processes logged into the database, whether it is an infrastructure database or a datastore database. The argument you need to make the shutdown command succeed, rather than hang as it waits, is one of transactional, immediate, or abort.

a database While the connection method using the SID is still available even in 11g Release 2, users are encouraged to use the SERVICE_NAME parameter in the CONNECT_DATA section of the local naming file Although services were introduced long ago, from a single-instance user s point-of-view, it wasn t entirely clear why one should prefer the service name to the ORACLE_SID Indeed, using services seemed to introduce more problems! Most of the networking issues in an Oracle environment are caused by incorrectly specified service names on the database and/or the local naming configuration The most common of these errors is possibly the infamous ORA-12514 error: TNS: listener does not currently know of service requested in connect descriptor.

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So what exactly are these services In a nutshell, they are logical entities you can define in Oracle RAC databases that enable you to group database workloads and route connection requests to the optimal instances that are assigned to offer the service In single-instance Oracle, services can be used to provide additional levels of granularity for statistics aggregation and tracing However, the full potential of services is realized in RAC environments by controlling which instances in the cluster perform a specific workload at different times for a given priority In many consolidation projects, individual services are created per application consolidated in the cluster Other than that, there is hardly a limit to the creativity of the users when it comes to defining services For instance, you can create services on a departmental basis or to reflect a certain type of workload such as batch processing or online reporting.

From the user s point of view, the most important part of a SSL or TLS handshake the first steps used to negotiate the secure communications channel is the server certificate. Among other things, the server certificate is what essentially authenticates the server with the client application, proving the server s identity to the client. The client application uses the server certificate three ways before continuing the rest of the handshake. First, the client application uses the server certificate to match the domain name of the certificate with the domain name of the site it s connecting to. Second, the certificate expiration date is checked. Third, the client application verifies the server certificate has been signed by a well-known, trusted certificate authority. If one or more of these checks fail, the client application will alert the user and ask how to proceed. Although the domain and expiration checks are important, SSL certificates are largely based on a certain amount of trust, as illustrated in Figure 10-2. Creating a chain of trust back to a final certificate that everyone agrees is trustworthy helps verify the validity of individuals. There are a number of trustworthy root certificates, issued by certificate authorities.

The transactional shutdown will disconnect all sessions that aren t doing anything but let other sessions finish their currently running statement or transaction before disconnecting them. This is the polite way to shut down a database. An immediate will disconnect all users immediately and roll back any currently active transactions. Either of these shutdown methods is clean. After the shutdown there are no incomplete transactions and all work is saved to the database. An abort will terminate the instance right away; no work is written to disk, no incomplete work is rolled back. The effect is exactly as though the power had been cut off or the server rebooted. There is nothing wrong with an abort, except that some maintenance work (such as backups) may not be possible until the instance recovery mechanism (invoked automatically after the next startup) has repaired the damage. An immediate or transactional shutdown may take a long time; abort is always virtually instantaneous. The fastest way to achieve a clean shutdown is first, abort the instance. Second, start it up in the restricted mode. This will trigger the instance recovery mechanism but prevent anyone from logging in. Third, shut down cleanly with immediate. A SQL*Plus script to do this is the following: connect sys/oracle as sysdba shutdown abort startup restrict shutdown immediate

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