tuning oracle sql queries

) | Time |----------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 96 | 2 (0) | 00:03:18 || 1 | TABLE ACCESS by INDEX rowid| Test_sql_advisor | 1 | 96 | 2 (0) | 00:03:18 ||* 2 | INDEX RANGE SCAN | Test_sql_advisor_idx | 1 | | 1 (0) | 00:01:39 |---------------------------------------------------------------------------------------------------- predicate information (identified by Operation ID):------------------------------

Tags: implementation mechanism originally page organizes tables based on free article content index ClustFollowing the book on SQL tuning (SQL tuning or SQL optimization) in the essentials of high-performance SQL

valuable, while the Oracle lock mechanism is more advantageous, allowing Oracle applications to be more comfortable with DML operations, but this does not mean that you can do whatever you do, and in reality, even a lot of senior developers, are not very understanding of the characteristics and application of Oracle transactions, so often unnecessary use of manu

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

to go. In the development, we have to do some optimization of business logic, to avoid complex logic operations, especially to avoid a very large number of cycles of business logic processing, on the one hand we want to simplify business logic, some business logic to the program to deal with, on the other hand we can use SQL very clever to achieve a lot of logic complex requirements, Avoid having to do a lot of complex logic processing, rather than

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

Oracle optimizations are generally divided into:1. SQL Optimization (Oracle now performs the necessary optimizations based on SQL statements, which should not be user-like, but must be and affect performance as correlated and nested queries)A, the condition of the

Oracle queries the average SQL Execution time (Code instance) through the v $ SQL view, oraclesqlOracle queries the average SQL Execution time (Code instance) through the v $ SQL View)

[Oracle] oracledba6 SQL Tuning sets, oracledba6tuning You want to use the SQL Tuning Advisor to generate recommendation S for badly written SQL statements in your development environment. W Hich three sources can you select for

Label:You want to use the SQL Tuning Advisor to generate recommendations for badly written SQL statements in your development environment. WHich Three sources can you select for the advisor to analyze? (ChooseThree.)A. Top SQLB. SnapshotsC. SQL Tuning SetsD. Index Access Pat

Label:You want to use the SQL Tuning Advisor to generate recommendations for badly written SQL statements in your development environment. WHich Three sources can you select for the advisor to analyze? (ChooseThree.)A. Top SQLB. SnapshotsC. SQL Tuning SetsD. Index Access Pat

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 execution of