By Thomas Kyte
This publication explains easy & develop approximately Oracle database and He wrote approximately his adventure, that is nice ;)
I recommend Oracle Developer & DBA learn this publication. i think this e-book is helpful...
Read or Download Expert Oracle Database Architecture: 9i and 10g Programming Techniques and Solutions PDF
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Additional info for Expert Oracle Database Architecture: 9i and 10g Programming Techniques and Solutions
Total Blocks, Total Bytes, Total MBytes: The total amount of space allocated to the segment measured in database blocks, bytes, and megabytes. • Unused Blocks, Unused Bytes: These represent a portion of the amount of space never used. These blocks are allocated to the segment but are currently above the HWM of the segment. • Last Used Ext FileId: The file ID of the file that contains the last extent that contains data. qxd 8/22/05 4:35 PM Page xxxix ■SETTING UP YOUR ENVIRONMENT • Last Used Ext BlockId: The block ID of the beginning of the last extent; the block ID within the last used file.
I’m referring to the Advanced Queuing (AQ) software that is burned into the database, functionality they were trying to reinvent. • The developers had no idea what the beans did in the database or where to look for potential problems. That was hardly the end of the problems on this project. We then had to figure out • How to tune SQL without changing the SQL. Oracle 10g actually does permit us to accomplish this magical feat for the first time to a large degree. • How to measure performance. • How to see where the bottlenecks are.
PL/SQL has been around for a very long time—over 18 years of tuning has gone into it. In fact, the Oracle10g compiler itself was rewritten to be, for the first time, an optimizing compiler. You will find no other language so tightly coupled with SQL or any as optimized to interact with SQL. Working with SQL in PL/SQL is a very natural thing, whereas in virtually every other language—from Visual Basic to Java—using SQL can feel cumbersome. It never quite feels “natural”; it is not an extension of the language itself.