By Thomas Kyte
Now in its 3rd variation, this best-selling publication keeps to deliver you the superior pondering on easy methods to observe Oracle Database to provide scalable functions that practice good and convey right effects. Tom Kyte and Darl Kuhn percentage an easy philosophy: "you can deal with Oracle as a black field and simply stick information into it, otherwise you can know the way it really works and take advantage of it as a robust computing environment." should you opt for the latter, then you’ll locate that there are few info administration difficulties that you just can't clear up speedy and skillfully.
This absolutely revised 3rd version covers the advancements as much as Oracle Database 12c. major new content material is incorporated surrounding Oracle's new cloud characteristic set, and particularly using pluggable databases. each one function is taught in a proof-by-example demeanour, not just discussing what it really is, but additionally the way it works, the way to enforce software program utilizing it, and the typical pitfalls linked to it.
Don’t deal with Oracle Database as a black-box. Get this e-book. Get lower than the hood. Turbo-charge your profession.
- Revised to hide Oracle Database 12c
- Proof-by-example process: permit the proof be your advisor
- Dives deeply into Oracle Database’s strongest beneficial properties
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Additional resources for Expert Oracle Database Architecture: Third Edition
This serialization will be a huge limiting factor in scaling. Think of the ramifications if this technique was used on web sites that processed orders, and this was how we generated order numbers. There would be no multiuser concurrency, so we would be forced to do everything sequentially. The correct approach to this problem is to use the best code for each database. In Oracle 12c this is as follows (assuming the table that needs the generated primary key is T): EODA@ORA12CR1> create sequence s; Sequence created.
And all of the databases are, in fact, ANSI compliant (ANSI compliance does not mean you support 100% of the standard, not by a long shot, see the next section “Impact of Standards” for details), but they still work differently. There are ambiguities, backward compatibility issues, and so on, to be overcome. For example, SQL Server supports the ANSI method of NULL comparison, just not by default (if it did, it would break thousands of existing legacy applications built on that database). In this case, one solution to the problem is to write the query like this instead: select * from t where ( x = l_some_variable OR (x is null and l_some_variable is NULL )) However, this leads to another problem.
Did you know that many commercially available databases are SQL99-compliant to at least some degree? Did you also know that it means very little as far as query and application portability goes? Starting with the SQL92 standard, the standards have four levels: • Entry-level: This is the level to which most vendors have complied. It is a minor enhancement of the predecessor standard, SQL89. No database vendors have been certified higher and, in fact, the National Institute of Standards and Technology (NIST), the agency that used to certify for SQL-compliance, does not even certify anymore.