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FAST REFRESH: Under the fast refresh mechanism, Oracle will use a materialized view log to log all changes to the master tables. It ll then use the materialized view log to update the materialized view. The materialized view log is a table based on the associated materialized view. Each of the tables involved in the join in the materialized view needs its own materialized view log to capture changes to the tables. Oracle can also use data from partition maintenance operation or a data load made by using the SQL*Loader direct-path method to perform the fast refresh of a materialized view. FORCE: If you choose this option, Oracle will try to use the fast refresh mechanism. If it isn t able to use it for some reason, it ll use the complete refresh method. NEVER: This refresh option never refreshes a materialized view. Obviously, this isn t a viable option for a materialized view whose master tables undergo significant change over time. The default refresh type is FORCE.

You must also edit the /home/oracle/.bash_profile file as follows, so the environment variables are set correctly each time the user oracle logs ins: umask 022 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ORACLE_BASE=/u01/app/oracle ORACLE_HOME=$ORACLE_BASE/product/10.2.0/db_1 PATH=$ORACLE_HOME/bin:$PATH LD_LIBRARY_PATH=$ORACLE_HOME/lib export ORACLE_BASE ORACLE_HOME export PATH LD_LIBRARY_PATH

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Even after you specify the query rewrite mechanism, the Oracle cost-based optimizer may not always automatically rewrite a query, accessing the master tables instead of the materialized view. Thus, even though you have a materialized view, the optimizer ignores it, defeating the purpose of creating and maintaining the materialized view. The Oracle optimizer does this because some conditions for query rewrite may not have been met. You can use the Oracle-supplied DBMS_MVIEW package to diagnose this and other materialized view problems. You can use the DBMS_MVIEW package s procedures in the following way: Use the EXPLAIN_MVIEW procedure to see what types of query rewrite are possible. Use the EXPLAIN_REWRITE procedure to see why a particular query is not being rewritten to use the materialized view. Use the TUNE_MVIEW procedure to enable a query rewrite. This procedure will suggest how you can rewrite a materialized view to make it eligible for a query rewrite. The TUNE_MVIEW procedure also tells you how to satisfy the requirements for a fast refreshable materialized view. The procedure will take your input and produce a materialized view creation script (and any necessary materialized view logs) that is ready to implement.

If you re installing the Oracle 10.2 software on a server where you already have other Oracle databases, Tip make sure you back up those databases first. Delete the ORACLE_HOME environment variable that you re currently using, and stop all running services if you re installing software in an already existing Oracle Database 10g Release 2 (10.2) home.

In this section, I ll show you how to create a basic materialized view, using some of the options that I described in the previous sections. If you aren t sure about which materialized views to create, you can take advantage of Oracle s SQL Access Advisor, which can make specific recommendations regarding the use of indexes and materialized views. The SQL Access Advisor can design a materialized view and tell you whether it s eligible for a query rewrite. The Using the SQL Access Advisor section, later in this chapter, covers the SQL Access Advisor in detail. There are three steps required to get the materialized views going, although the creation itself is simple: 1. Grant the necessary privileges. 2. Create the materialized view log (assuming you re using the FAST refresh option). 3. Create the materialized view.

To ensure that your Oracle installation won t abort in the middle, make sure you satisfy the following requirements: Make sure you have enough temporary space. There is usually only a small amount of temporary space on most UNIX servers something like 100MB or so. If this is the case on your system, your Oracle installation will fail midway through, because Oracle uses the temporary directory on the server heavily during the installation process. You have two ways to get around this problem. You can either ask your system administrator to increase the size of the temporary directory on the server, or you can change the environment variable for the temporary directory. Usually, you do this by setting the TMPDIR environment variable to something other than /tmp and making sure that there is at least 400MB of space under this temporary directory. Here s how I changed my temporary space during the Oracle installation: $ export TMPDIR=/test01/app/oracle/tmp $ export TMP=/test01/app/oracle/tmp Make sure the swap space is set to a high amount, at least satisfying Oracle s requirements specified in the operating system specific installation guide. Oracle provides a matrix recommending varying swap space requirements based on the size of the available RAM. Make sure you allocate about 500MB to avoid any swapping or paging problems on the server. Make sure your Oracle kernel is modified to meet your installation requirements. Even if you install the server software correctly, if kernel parameters such as SHMMAX and SEMMNS are not set high enough and you have a large number of processes in your initialization file, your database creation will fail.

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