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Creating a synonym that points to another object eliminates the need to specify the schema owner or name of the object. This lets you create a layer of abstraction between an object and the user, often referred to as object transparency. Synonyms allow you to transparently manage objects separately from the users who access the objects. For example, you can use synonyms to set up multiple application environments within one database. Each environment would have its own synonyms that point to a different user s objects, allowing you to run the exact same code against several different schemas within one database. You might do this because you can t afford to build a separate box or database for development, testing, quality assurance, production, and so on. You can create synonyms for the following types of database objects: Tables Views or object views Other synonyms Remote objects via a database link PL/SQL packages, procedures and functions Materialized views

Consolidation of storage management Mirroring/triple mirroring equivalence Striping Mirroring across heterogeneous storage arrays Mirroring across different storage vendors Real application cluster support

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You can also define a synonym to be public, which means that any user in the database has access to the synonym. Sometimes, what lazy (or inexperienced) DBAs do is the following: grant all on books to public; create public synonym books for inv_mgmt.books; Now any user that can connect to the database can perform any INSERT, UPDATE, DELETE, or SELECT operation on the BOOKS table that exists in the INV_MGMT schema. DBAs might be tempted to do this so they don t have to bother setting up individual grants and synonyms for each schema that needs access. This is almost always a bad idea. There are a few issues with using public synonyms: Troubleshooting can be problematic if you re not aware of globally defined (public) synonyms. Applications that share one database can have collisions on object names if multiple applications use public synonyms that are not unique within the database Security should be administered as needed, not on a wholesale basis.

Many DBAs have numerous misconceptions about ASM. By revealing the truth about ASM, DBAs, SAs, and SAN administrators can make cognitive decisions about implementing ASM. First, ASM does not automatically rebalance the IO. The rebalance activity of an ASM diskgroup happens only when adding or dropping disks from the diskgroup. Second, ASMLIB is available only for Linux and Windows. ASMLIB is a support library for ASM that simplifies the management and discovery of ASM disks. ASMLIB is not a requirement to implement ASM but is highly recommended. Third, you can implement ASM without RAC. Although ASM tends to be implemented with RAC, it performs well in stand-alone non-RAC environments too. With ASM, Oracle installs and configures a lightweight cluster agent called Cluster Synchronization Services (CSS). More and more companies are adopting ASM in a single instance for ease of manageability and performance. On the same note, DBAs, SAs, and SAN administrators may be unaware of some hidden ASM features. You can leverage ASM mirroring technologies to simulate protection equivalence to mirroring and triple-mirroring technologies using normal and failure redundancy.

Sometimes it s useful to dynamically generate synonyms for all tables or views for a schema that needs private synonyms. The following script uses SQL*Plus commands to format and capture the output of a SQL script that generates synonyms for all tables within a schema: CONNECT &&master_user/&&master_pwd.@&&tns_alias -SET LINESIZE 132 PAGESIZE 0 ECHO OFF FEEDBACK OFF VERIFY OFF HEAD OFF TERM OFF TRIMSPOOL ON -SPO gen_syns_dyn.sql -select 'create synonym ' || table_name || ' for ' || '&&master_user..' || table_name || ';' from user_tables; -SPO OFF; -SET ECHO ON FEEDBACK ON VERIFY ON HEAD ON TERM ON; Notice the &&MASTER_USER variable with the two dots appended to it in the SELECT statement. A single dot at the end of an ampersand variable instructs SQL*Plus to concatenate anything after the single dot to the ampersand variable. So when you place two dots together, that tells SQL*Plus to concatenate a single dot to the string contained in the ampersand variable.

Knowing RMAN is a must when considering ASM. DBAs who are not intimate with RMAN do not have a choice but to learn and become experts with RMAN. There are numerous ways to transfer files from and to ASM, but believe it or not, nothing compares in performance and ease of maintenance than RMAN. ASM has the option to utilize technologies such as WebDav or FTP in conjunction with XML DB, but this option complicates the environment and supportability.

Table B-2. BugReport Interface (Continued)

You want to ensure that the data entered into the database conforms to certain business rules. For example, you need to ensure that a new department will not be mistakenly added under the same department number as an existing one. You want to enforce uniqueness with a primary key constraint.

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