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The data dictionary contains metadata: that is, data about data It describes the database, both physically and logically, and its contents User definitions, security information, integrity constraints, and (from release 10g onward) performance monitoring information are all part of the data dictionary It is stored as a set of segments in the SYSTEM and SYSAUX tablespaces In many ways, the segments that make up the data dictionary are like other regular table and index segments The critical difference is that the data dictionary tables are generated at database creation time, and you are not allowed to access them directly There is nothing to stop an inquisitive DBA from investigating the data dictionary directly, but if you do any updates to it you may cause irreparable damage to your database, and certainly Oracle Corporation will not support you Creating a data dictionary is part of the database creation process It is maintained subsequently by Data Definition Language (DDL) commands When you issue the CREATE TABLE command, you are not only creating a data segment to store your data in its rows, your DDL command has the side effect of inserting rows into many data dictionary tables that keep track of segment-related information including tablespace, extent, column and ownership related properties To query the dictionary, Oracle provides a set of views which come in three forms, prefixed with: DBA_, ALL_, or USER_ Most of the views come in all three forms Any view prefixed USER_ will be populated with rows describing objects owned by the user querying the view So no two users will see the same contents When user JOHN queries USER_TABLES, he will see information about only his tables; if you query USER_TABLES, you will see information about only your tables Any view prefixed ALL_ will be populated with rows describing objects to which you have access So ALL_TABLES will contain rows describing your own tables, plus rows describing tables belonging to anyone else that you have been given permission to see Any view prefixed DBA_ will have rows for every object in the database, so DBA_TABLES will have one row for every table in the database, no matter who created it Figure 3-10 describes the underlying concept represented by the three forms of dictionary views The USER_ views sit in the middle of the concentric squares and only describe an individual user s objects The ALL_ views in the middle display all the contents of the USER_ views, and in addition describe objects that belong to other schemas but to which your user has been granted access The DBA_ views describe all objects in the database Needless to say, a user must have DBA privileges to access the DBA_ views.

The function returns the location of the file pointed to by the symbolic link EXPR, or $_ if none is specified If the value cannot be determined, or if EXPR is not a symbolic link, the function returns undef Also be aware that symbolic links can be relative to the location of the link, rather than a full pathname The value returned to you will only be of any use if you are currently in the same directory as the link you are reading You may remember the access permissions information returned by stat earlier in this chapter The access permissions (mode) of a file can also be set using the chmod function:

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The MODE should be the numerical value associated with a specific file mode Normally, this information is represented as an octal value (as seen earlier) For example, to change the permissions of a file to be readable by everybody:

These views are created as part of the database creation process, along with a large number of PL/SQL packages that are provided by Oracle to assist database administrators in managing the database and programmers in developing applications TIP Which view will show you ALL the tables in the database DBA_TABLES, not ALL_TABLES There are hundreds of data dictionary views Some of those commonly used by DBAs are DBA_OBJECTS DBA_USERS DBA_TABLES A row for every object in the database A row describing every datafile

With Windows 95, the registry replaced INI files as the preferred location to store configuration data, and installers generally added a number of registry settings As more features were added to Windows, installers became more complex in an attempt to deal with these features; dealing with COM registration, MDAC versioning, event log sources, and COM+ applications all became part of the installation activities NET took a back-to-the-future approach with Windows Forms applications XCOPY deployment, where the EXE and DLL files were simply copied onto disk and run, was billed as a major improvement XCOPY fell short in many areas who created the shortcuts in the Start menu, where do per-user settings go, and how does a new version of the application get installed An alternative to XCOPY was trickle-down deployment, where the use of the AssemblyLoadFrom() method bought assemblies down across the network or Internet.

chmod 0444, $file;

There are many more than these, some of which will be used in later chapters Along with the views, there are public synonyms onto the views A query such as this,

The most common mistake when using this command is to specify a decimal rather than octal number Remember that Perl identifies octal numbers by a leading zero, or you can use the oct function to convert a decimal value to its octal equivalent The LIST is the list of file names whose mode you want to change, and the function returns the number of files that successfully had their modes changed To find out which files have not been successfully modified, you will either need to use a loop or use the grep function to identify the files in a list For example:

@failure = grep { not chmod 0444, $_ } @files; warn "Unable to change the mode of @failure" if @failure;

select object_name,owner, object_type from dba_objects where object_name='DBA_OBJECTS';

To change the user and group ownership of a file, you need to use the chown function:

shows that there is, in fact, a view called DBA_OBJECTS owned by SYS, and a public synonym with the same name

The USERID and GROUPID are the numerical IDs of the user and group, and LIST is the list of files whose ownership you want to change For example:

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