oracle sql certification book

: Network Disk DownloadContent IntroductionEditing the volume of information contained in this book can improve your programming skills to a new level. You'll learn how to write dynamic PL/SQL programs and Oracle database interfaces, perform complex computations, and use advanced techniques to control error conditions. In addition, you will receive up-to-date inf

Tags: oracle plsql performance Language SQLThese days to see the Oracle PL/SQL Real-combat this book, out of the study of the performance of the statement, the downstream standard on the impact of the code.1. Progressive processing The program declares a cursor c1, and then implicitly opens the cursor with a cursor fo

Database concurrent access, where two or more users access the same data at the same time, is the biggest problem for the database engine to design and implement a moderate response. A well-designed, performance-capable database engine can easily serve thousands of users at the same time. And the "weak" database system with more users to access the system will greatly reduce its performance. In the worst case, it could even cause the system to crash. Of course, parallel access is the most impor

Oracle optimization is itself a difficult thing to do and everything involved. Let's talk about my optimization experience (for beginners only):Many of the optimization experiences mentioned in the book include indexes, table structures, scalar queries, and database-level optimizations, but 80% of optimizations can be statement-level optimizations. The optimized objects include: procedure, function, and SQL

| | ' Publishing house is ' | | V_pubhouse); End Loop; Dbms_output.put_line (' Total record is: ' | | v_myrows| | ' Article '); sql> exec Fenyeceshi (' books ', 2,2); The book ID is: 3 the name is: Angle publishing house is 20 book ID is: 4 name is: Anglele publishing House is 10 Total records: 4 Total Pages: 2 pages ？？ : This will get the result,

rationally;② Historical Data Quick cleanup: ALTER TABLE t truncate partition P1;.Disadvantages:① too many partitions also increase overhead, and in general, tables above the million data level are considered for partitioning.② too many partitions also result in a workload on partition maintenance.4. Index Organization table (index-organized Tables)The table itself is the index, and the index itself is the table. For configuration tables that are rarely updated.Pros: eliminate back tables and ap

(belonging to understanding knowledge) Desc user_views; Select text from user_views where view_name= ' test1_v1 '; The diagram is equivalent to a SELECT statement that defines an illustration that defines an SQL statement that does not occupy space, and that using view does not improve performance, but simplifies the SQL statement (Extended Knowledge: Oracle 8i