oracle sql tuning tips

Http://www.sqlservercentral.com/articles/Performance+Tuning/70647/Tips to optimize your SQL statementsby Brian Ellul, 2010/07/29 Introduction There is a huge difference between writing an SQL statement which works and one which works well and performs well. sometimes developers are too focused on just writing their

The following applies to Oracle 10.2.0.5 and aboveOne query is slow, and the original SQL is as follows:1 Select 2A.*3 from(Select 4 Ssi.id,5 'Small_station_info'TB,6(SelectSbi.name7 fromScene_base_info SBI8 whereSbi.id=Ssi.antenna_selection) asAntenna_selection,9 Ssi.antenna_height,Ten Ssi.down_angle, One Ssi.azimuth_angle, A SSI. ITI_ID, - Sa.longitude, - Sa.lati

read times. The ways to refine each statement are:Check Optimizer statistics，Check the interpretation plan for the most efficient access pathMeasuringtry to replace SQL constructs, and test for possible new indexes, manifested views, and partitions. Test the performance of the entire application using the optimized SQL statement. Is overall performance improved? The method is reliable, but somewhat dilator

of the SQL statement, and combine its resource consumption and related statistics, trace files to analyze its execution plan is reasonable;2, through the correction measures (such as adjusting the SQL execution plan, etc.) to adjust the SQL to shorten its execution time, here is the guiding principle of tuning is the

SQL optimization skills (Oracle), SQL optimization skills oracle SQL optimization tips (1): Connection sequence in the Where clause: oracle parses the where clause in order from bottom

Author: Jiangnan BaiyiFrom 8 I to 10g, Oracle constantly evolved its own SQL tuning intelligence, and some secret-level optimization tips have expired.However, I like to be ineffective. I don't have to worry about it. I love to stick to toad for Oracle Xpert, and I love to d

Oracle tips skills Oracle tips skills Recently, many people in the group have discussed oracle Security Issues. Today I have found some materials to learn more. Obtain the attributes of the current Oracle SESSION (useful for det

system to maintain data consistency and sequential recovery of important signs. Iv. further study Management: You can test the OCP certificate, the Oracle first has a systematic study, and then look at Oracle Concepts, Oracle online document, Oracle will have a more in-depth understanding of the principles, and can be

that does not read data or execute plans, however, Oracle has provided a large number of built-in SQL optimization tools since 10 Gb. For example: ADDM, SQL Access Advisor, SQL Tuning Advisor, Automatic SQL

in a plan baseline. If Plan_name is also specified, the corresponding execution plan is displayed.Note: In order to preserve backward compatibility, the statement will be compiled with this storage outline if the stored outline pair of an SQL statement for a user session is active. In addition, even if automatic scheduled capture is enabled for the session, the optimizer is not stored in SMB with a plan that is generated by the storage outline.Althou

Tags: SQL statement Oracle Shortcut key toolbar1, class SQL Plus Windows: File->new->command window, this is similar to Oracle's client tool SQL Plus, but it is much more useful.2, set the keyword automatic capitalization: tools->preferences->editor, will keyword case select uppercase. When you enter

Tips for using temporary tables in Oracle stored procedures 1. Oracle temporary table knowledge in Oracle, temporary tables are divided into SESSION and TRANSACTION. SESSION-level temporary table data exists throughout the SESSION, the temporary table data at the TRANSACTION level disappears after the TRANACTION ends,

PL/SQL Developer usage tips, shortcut keys1, set the keyword automatic capitalization: tools->preferences->editor, will keyword case select uppercase. When you enter SQL statements in a window, the keywords are automatically capitalized, and the others are lowercase. This is easy to read code, and to maintain a good coding style, in the same way, in Tools->prefer

oracle| Tips Author: Liu Yingbo Collection and finishing Time: April 29, 2004 Reprint please indicate the source, thank you! 1. Find Useless index: DML performance is low, one of the most serious reasons is the existence of useless indexes. All SQL inserts, updates, and deletions become slower when they need to modify a large number of indexes when each row

of this method will clear the parameters, but the URL method will not lose parameters, so I recommend the URL method.2. Observe the debug recordWhen debug mode is turned on, the desired operation is performed, and then the view debug is used to see the operation record.3. Add the customized informationIn addition to some of the default log information, we can also add our customized information, such as printing some parameter values of the halfway step. This can take advantage of some PL/

Label:1, class SQL Plus Windows: File->new->command window, this is similar to Oracle's client tool SQL Plus, but it is much more useful. 2, set the keyword automatic capitalization: tools->preferences->editor, will keyword case select uppercase. When you enter SQL statements in a window, the keywords are automatically capitalized, and the others are lowercase. T

Oracle Database Operation tips Oracle Database Operation tips The ORACLE tutorial is an Oracle database operation skill set. [Editor's note:] Oracle (

1, class SQL Plus Windows: File->new->command window, this is similar to Oracle's client tool SQL Plus, but it is much more useful.2, set the keyword automatic capitalization: tools->preferences->editor, will keyword case select uppercase. When you enter SQL statements in a window, the keywords are automatically capitalized, and the others are lowercase. This is

Label:1, class SQL Plus Windows: File->new->command window, this is similar to Oracle's client tool SQL Plus, but it is much more useful. 2, set the keyword automatic capitalization: tools->preferences->editor, will keyword case select uppercase. When you enter SQL statements in a window, the keywords are automatically capitalized, and the others are lowercase. T