oracle sql tuning books

archived redo logs are transmitted or submitted to a remote server, then the primary database is obviously in archive mode, and those files are generated. Running in this mode allows for a small amount of data loss, because recovery can be performed at any point before a failure, regardless of the type of failure. This is similar in MSSQL, but there are three states to choose from. SQL Server Books Online

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 for loop, the program queries the Customers tab

: 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 information on Pl/sqltoolkit,java integration an

| | ' 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, but the main process is very confused about w

statement by filtering out unwanted records before group by. The following two queries return the same result but the second one is obviously much faster. Low efficiency: SELECT JOB, AVG (SAL) From EMP GROUP JOB Having JOB = ' PRESIDENT ' OR JOB = ' MANAGER ' Efficient: SELECT JOB, AVG (SAL) From EMP WHERE JOB = ' PRESIDENT ' OR JOB = ' MANAGER ' GROUP JOB Translator by: This section and section 14 are the same. can skip over. 50. Date of Use When using the date is, be awa

The Oracle tutorial you are looking at is: Oracle SQL Performance Tuning Series learning three. 8. Use the Decode function to reduce processing time Use the Decode function to avoid repeatedly scanning the same record or repeating the same table. For example: SELECT COUNT (*), SUM (SAL) from EMP WHERE dept_no = 0020

SQL IsNull (oracle,mysql tutorial, MSSQL) IsNullReplaces null with the specified replacement value. GrammarIsNull (Check_expression, Replacement_value) ParametersCheck_expression An expression that will be checked for null. Check_expression can be of any type. Replacement_value An expression to be returned when check_expression is null. Replacement_value must be with Check_expresssion has the same ty