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Each tube could carry messages from one specific office to another The wiring in an EBS establishes paths for event notifications The part designated to wire a system can do so without needing to know how the parts being wired actually work I ll call the wiring part a binder Like a contractor installing a pneumatic tube delivery system, a binder only needs a list of items to hook together The binder doesn t need to know why the items need to be connected, what type of traffic will be sent over the connections, or how the overall business works Binders connect outputs to inputs Outputs are outgoing calls, and inputs are methods to call, exposed by objects Outputs and inputs come into existence only after objects are created at run time (if you ignore the case of class methods, which can be called without having to create any objects).

l_uncompressed_blob := TO_BLOB('1'); UTL_COMPRESS.lz_compress (src => l_original_blob, dst => l_compressed_blob); UTL_COMPRESS.lz_uncompress (src => l_compressed_blob, dst => l_uncompressed_blob); DBMS_OUTPUT.put_line('Original Length : ' || LENGTH(l_original_blob)); DBMS_OUTPUT.put_line('Compressed Length : ' || LENGTH(l_compressed_blob)); DBMS_OUTPUT.put_line('Uncompressed Length: ' || LENGTH(l_uncompressed_blob)); DBMS_LOB.FREETEMPORARY(l_original_blob); DBMS_LOB.FREETEMPORARY(l_compressed_blob); DBMS_LOB.FREETEMPORARY(l_uncompressed_blob); END; SQL>

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ops$tkyte@ORA10G> insert into t values ( 'N' ); 1 row created Now, in another SQL*Plus session, if I execute ops$tkyte@ORA10G> insert into t values ( 'N' ); that statement will hang until I issue a COMMIT in the first blocking session So here we had an issue whereby a lack of understanding of the database feature (bitmap indexes), of what it did and how it worked, meant that the database was doomed to poor scalability from the start Once this issue was discovered, correcting it was easy We needed an index on the processed flag column, but not a bitmap index We needed a conventional B*Tree index here This took a bit of convincing because no one wanted to believe that use of a conventional index on a column with two distinct values was a good idea.

The UTL_MAIL package enables you to send and receive e-mail, along with attachments, CC, BCC, and return receipt features. Unlike most of the other packages in this chapter, you ll have to configure a couple things before you can use it. First, you must install the UTL_MAIL package in your database, as shown here: SQL> CONNECT sys/sys_passwd SQL> @$ORACLE_HOME/rdbms/admin/utlmail.sql SQL> @$ORACLE_HOME/rdbms/admin/prvtmail.sql After you install the package, you must define the SMTP_OUT_SERVER parameter in your init.ora initialization file or the SPFILE (if you re using it), as shown here: SQL> ALTER SYSTEM SET smtp_out_server='my.domain.com' SCOPE=SPFILE;

If you don t specify a value for the SMTP_OUT_SERVER parameter, then the SMTP server name defaults to the value of DB_DOMAIN and the port number defaults to 25.

But after setting up a simulation (I am very much into simulations, testing, and experimenting), we were able to prove that it was the correct approach There were two ways to approach the indexing of this particular column: Just create an index on the processed flag column Create an index only on the processed flag column when the processed flag is N that is, only index the values of interest Typically, we do not want to use an index where the processed flag is Y, since the vast majority of the records in the table would have the value Y Notice that I did not say We never want to use if you need to frequently count the number of processed records for some reason, then an index on the processed records may well prove useful..

Before a binder can do any binding, there must be objects to bind It is possible to centralize the instantiation of the main objects (the coordinators and workers), giving the responsibility to a dedicated component I ll call a builder In one form or another, functional roles are present in all software systems In a messy system, the roles are scattered across groups of parts, and the parts are generally heavily coupled to each other In a well-designed EBS, the roles are much more recognizable, with each part playing a clear role Once you ve worked with EBSs and roles long enough, you ll start to think of software systems as a network of parts with specific roles But don t underestimate the importance of wiring, because wiring is what is responsible for making the whole greater than the sum of the parts.

Because the SMTP_OUT_SERVER parameter isn t a dynamically modifiable parameter, you must restart the database at this point to use the SMTP server. Here s an example that shows how to send an e-mail using the UTL_MAIL package: SQL> BEGIN UTL_MAIL.send(sender recipients cc bcc subject message END; / SQL> => => => => => => 'salapati@netbsa.org', 'samalapati@yahoo.com', 'shannonalapati@yahoo.com', 'salapati@hotmail.com', 'Testing the UTL_MAIL Package', 'If you get this, UTL_MAIL package really works!');

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