oracle pl sql performance tuning tips techniques

SQL execution is slow, how fast and accurate optimization. SQLHC is one of the best tools. By getting all the SQL execution plans, list the actual performance bottlenecks, listing the number of rows on the table where SQL resides, the data and distribution of each column, the existing index, the actual ex

(Setup method: Menu tools–>preferences–> user interface –> key configuration)New SQL window: Ctrl+shift+sNew command window: ctrl+shift+cNew Test window: ctrl+shift+tPL/SQL developer beautification: ctrl+shift+fRedo: Ctrl+shift+zUndo: Ctrl + ZClear: Ctrl+d (use caution, unrecoverable, I am disabled O (∩_∩) o~)Check all: Ctrl + AIndent: TabCancel indent: Shift+tabUppercase: Ctrl+shift+xLowercase: ctrl+shift

The scope of the PL/SQL variable, which is valid within the current block.DeclareV_num number (5,2): = 1.23;BeginDeclare V_num char (10);BeginV_num: = 12345;Dbms_output.put_line (V_num);EndDbms_output.put_line (V_num);EndSql> Declare2 v_num Number (5,2): = 1.23;3 begin4 Declare V_num char (10);5 begin6 V_num: = 12345;7 Dbms_output.put_line (V_num);8 End;9 Dbms_output.put_line (V_num);Ten end;11/123451.23PL/

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 processin

(Setup method: Menu tools–>preferences–> user interface –> key configuration)New SQL window: Ctrl+shift+sNew command window: ctrl+shift+cNew Test window: ctrl+shift+tPL/SQL developer beautification: ctrl+shift+fRedo: Ctrl+shift+zUndo: Ctrl + ZClear: Ctrl+d (use caution, unrecoverable, I am disabled O (∩_∩) o~)Check all: Ctrl + AIndent: TabCancel indent: Shift+tabUppercase: Ctrl+shift+xLowercase: ctrl+shift

(Setup method: Menu tools–>preferences–> user interface –> key configuration)New SQL window: Ctrl+shift+sNew command window: ctrl+shift+cNew Test window: ctrl+shift+tPL/SQL developer beautification: ctrl+shift+fRedo: Ctrl+shift+zUndo: Ctrl + ZClear: Ctrl+d (use caution, unrecoverable, I am disabled O (∩_∩) o~)Check all: Ctrl + AIndent: TabCancel indent: Shift+tabUppercase: Ctrl+shift+xLowercase: ctrl+shift

Two test samples were made in the art of simulating Oracle performance diagnostics. The book says not to bear relies_on. Cache (Result_cache relies_on (test1,test2)). The test proved incorrect, and the function F1 () did not use relies_on, but the changes on the table affected the function. C:\Documents and Settings\guogang>sqlplus Gg_test/[email Protected]_ggSql*plus:release 10.2.0.1.0-production on Monday

-align:middle; "/>There is a question worth thinking about: developing or testing why not in the front of the application of the PID before and after the implementation of the white space function trim, rather than put on the database side to execute, which not only aggravate the workload of the database server,It is also easy to cause the full table scan of large tables due to improper use of the function to reduce the execution speed of SQL; althoug

is much higher than that of the composite Index query efficiency, while in 11.2.0.3 version Verify that the ad hoc query efficiency of the common composite index is more efficient than the efficiency of the bitmap index) Create TableT (name_id, gender not NULL, location not NULL, Age_range not NULL, data) as Selectrownum, Decode ( Floor(Dbms_random.value (0,2)),0,'M',1,'F') gender, Ceil (Dbms_random.value (0, -) Location , decode ( Floor(Dbms_random.value (0,4)),0,' Child',1,' Young',2,'Middle

Tags: oracle plsql indexed viewA view and index of the start of PL/SQL basics PL/sql: Process language (Procedure Language) and structured language (structured Query Language)The combination of the programming language, is theSQLextensions that support multiple data types, s

View and index of basic PL/SQL PL/SQL: a programming Language combined with a Structured Language (Structured Query Language). It is an extension of SQL and supports multiple data types, such as large objects and Collection types, you can use control statements such as condi

: (Exception) This section starts with exception and ends with end Demo: declare– Optional variable, constant, cursor, user-defined special type begin– must --sql statement --pl/sql statement exception– Optional --Exception handling Section END; -Must be declared, executed, and made up of exce

The SQL Tuning toolset (SQL Tuning set,sts) is an integral part of the Oracle 10g SQL Tuning Advisor feature. Each tuning toolset contains o

. Setup method: Right- --special copy 6. Custom shortcut keys Plsql developer has a lot of keys reserved for users to customize, which is very hight thing. Unlike the overbearing Word, basically all the keys have been pre-defined features, the change is very headache. Usually, after opening plsqldeveloper, the most frequently done thing is to open Sqlwindow and CommandWindow, the two operations have defined shortcut keys,alt+s and ALT + C, So take the mouse to point three things only need to p

Label:I. What is PL/SQL?PL/SQL (procedural language/sql) is an extension of Oracle in the standard SQL language.PL/SQL not only allows the e

–> user interface –> key configuration) New SQL window: ctrl+shift+s new command window: ctrl+shift+c new test window: ctrl+shift+t PL/SQL Developer: Ctrl+shift+f Redo: ctrl+shift+z undo: Ctrl + Z clear: ctrl+d (use with caution, not recoverable, I am disabled Oh O (∩_∩) o~) Check all: Ctrl + a indent: tab Cancel indent: Shift+tab uppercase: Ctrl+shift+x lowercas

Brief introduction There are a number of sources available for how to tune your database systems and applications. DB2 tuning techniques such as OLTP applications (previously published in the ibm®db2® Developer's Garden) some suggestions from table space and index design to buffer pool memory allocation are given through the use of transaction and data parallelism and analysis of query scenarios. These asp

Tags: style blog http java color useI. What is PL/SQL?PL/SQL (procedural language/sql) is an extension of Oracle in the standard SQL language.PL/SQ