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The critical operations recorded in the alert log include All startup and shutdown commands, including intermediate commands such as ALTER DATABASE MOUNT All errors internal to the instance (for example, any ORA-600 errors) Any detected datafile block corruptions Any record locking deadlocks that may have occurred All operations that affect the physical structure of the database, such as creating or renaming datafiles and online redo logfiles All ALTER SYSTEM commands that adjust the values of initialization parameters All log switches and log archives The alert log entry for a startup shows all the nondefault initialization parameters This information, together with the subsequent record of changes to the instance made with ALTER SYSTEM commands and to the database physical structures made with ALTER DATABASE commands, means that it is always possible to reconstruct the history of changes to the database and the instance This can be invaluable when trying to backtrack in order to find the source of a problem TIP For many DBAs, the first thing they do when they are asked to look at a database for the first time is locate the alert log and scan through it, just to get an idea of what has been going on Trace files are generated by the various background processes, usually when they encounter an error These files are located in the BACKGROUND_DUMP_DEST directory, along with the alert log If a background process has failed because of an error, the trace file generated will be invaluable in diagnosing the problem Exercise 3-3: Use the Alert Log In this exercise, locate the alert log and find the entries for the parameter changes made in Exercise 3-1 and the startups and shutdowns in Exercise 3-2 1 Connect to your database with either SQL*Plus or SQL Developer, and find the value of the BACKGROUND_DUMP_DEST parameter:.

Creation of a new hard link updates the link count (the number of links to a file); the significance of this will be seen shortly If the function fails, it returns a value of zero and sets the error string in $! Note that you cannot create hard links across file systems, because the new directory entry must refer to the inode of a file on the same file system Use symbolic links instead Since the notion of a duplicate directory entry for an existing file is a Unix feature, other operating systems are unlikely to support this option They may, however, support symbolic links via the symlink function Certainly Mac OS and Windows support symbolic links in the form of aliases and shortcuts, respectively A symbolic link is similar in principle to a hard link; however, rather than duplicating the

select value from v$parameter where name='background_dump_dest';

7:

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information about an existing inode, a symbolic link contains a reference (the path) to the file you want to link to:

Note that this value can also be found with Database Control 2 Using whatever operating system tool you please (such as Windows Explorer, or whatever file system browser your Linux session is using), navigate to the directory identified in Step 1 3 Open the alert log It will be a file called alert_SIDlog, where SID is the name of the instance Use any editor you please (but note that on Windows, Notepad is not a good choice because of the way carriage returns are handled WordPad is much better) 4 Go to the bottom of the file You will see the ALTER SYSTEM commands of Exercise 3-1 and the results of the startup and shutdowns

Because a symbolic link is a reference to a file, rather than a physical pointer to a real file, you can create a symbolic link on any file system and have it point to any other file system Symbolic links do not update the link count either This is significant because the link count of an inode is used by the file system to determine whether a file is to be deleted completely The unlink function deletes a link from a file system If you a delete a link, you are only deleting the directory entry that relates the file name you see in the file list to the physical file By deleting a link, you effectively remove access to the file For most files you create, there will be only one link to the file (the name you originally gave it) Once the link count in the inode reaches zero, the file system deletes the file in question In effect, therefore, the unlink function does not actually delete a file; it only decrements the link count for the inode number to which the directory entry relates

An Oracle database is defined by its data dictionary The data dictionary is not very comprehensible For this reason, Oracle provides a set of views onto the data dictionary that are much easier to understand These views provide the DBA with a tool for understanding what is happening in the database The instance also has a set of tables (which are in fact C data structures) that are not easily understandable These are externalized as the dynamic performance views that are key to understanding what is happening within the instance

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