sql tuning advisor

11g new Features-automatic SQL tuning (Automatic SQL Tuning)In Oracle 10g, an automatic SQL Tuning feature was introduced. In addition, ADDM monitors SQL statements that capture high lo

Tags: des style blog io using ar strong SP CTIAdvanced SQL Optimization (iii) Common optimization tools--12 Senior DBA teaches you Oracle development and optimization--Advanced SQL Optimization (i)--12 Senior DBA teaches you Oracle development and optimization-Performance optimization section1 autotraceSet Autotrace on2 Using SQL

Label:You find, the execution time of reports in your DatawarehouseApplication is significantly high. You suspect the lack of indexes toBeing the reason for the degradation in performance. which advisory CompOnent would you refer to, in order to determine the appropriate indexEs?A. Memory AdvisorB. Segment AdvisorC. SQL Access AdvisorD. Automatic Workload Repository (AWR)E. Automatic Database Diagnostic Monitor (ADDM)Answer:cYou find that the executio

Tags: ash text results SQL tuning SRC completion need to end TunA few days ago, a user developed QQ to find me, as follows:The free Dolphin. 16:12:01The island owner, my SQL can not find the results, could you help me see?Orchid Island Main 16:12:10How long is the result?The Free Dolphin 16:12:17How long has not produced the result, has not seen the result.Orchid

SQL Server Performance Tuning methodology and common tools, SQL Server Tuning In earlier articles, we mentioned the DETECT methodology in Performance Tuning. Here we will briefly review the DETECT methodology. Discover the problem: found the problem Lead e the conditions: E

I. Preface Index plays an important role in database performance. The advantages and disadvantages of index design directly affect the efficiency of DB execution. Therefore, when performing DB tuning, some of them will start to process the index. SQL server also provides a good tool for Database Engine Tuning Advisor a

Label:Original: SQL Server Tuning series advanced (How to index tuning)ObjectiveIn the previous article we analyzed the role of statistical information in the database, and we have learned how the database uses statistics to control the distribution of the contents of tables in the database. Children's shoes are not clear and can be clicked for reference.As a

either: Auto-capture:automatically captured Manual-load:manually evolved Manual-sqltune:automatically evolved by SQL Tuning Advisor Auto-sqltune:automatically evolved by Automatic SQL Tuning ENABLED Indicates the

Common SQL Tuning Tips and SQL Tuning tuningtips Create an appropriate index (refer to correct database index creation) Replace OR with UNION (applicable to index columns) Replace in and not in with exist and not exist Do not declare numbers in character format (this will invalidate the index an

Oracle tuning uses related SQL, oracle tuning related SQL Select * from v $ session where username is not null;Select username, count (username) from v $ session where username is not null group by username;Select count (*) from v $ process;Select value from v $ parameter where name = 'processs ';Select count (*) from

dedicated data buffers (keep buffer cache,nk buffer cache) are available for these tables. After Oracle 8 small tables can be forcibly cached to the keep pool. Using the best index Oracle Access objects sometimes have more than one index selection. Therefore, you should check each index on the current query object to ensure that Oracle uses the best index. Materialized aggregation operations with static table statistics One of the features of Oracle 10g

Tags: sdn is ola visible reason water personal tuning tunToday, while watching Tri Hua's SQL optimization book, he saw a case in which he solved the SQL performance problem, and Tri Hua the teacher successfully positioned the problem and solved it. Here, on the basis of Tri Hua teacher analysis and positioning, do further analysis and reasoning, so that we can st

Supports SQL tuning and SQL TUNING A friend of mine found me a few days ago and said that an SQL Performance problem exists to see if it can be optimized. The process is as follows: Snow Leopard 9:35:10 Are you there? Orchid island master 15:07:39 I forgot. What's the matter

inner table size is multiplied by the number of parallel service processes greater than the physical size.3) Pq_distribute (Tab_name, none,broadcast): This combination forces all data rows within the table to be broadcast to each consuming parallel query service process, while the outer data rows are randomly partitioned. This hint is recommended when the inner table is more than the outside hour. An important principle is that the none/broadcase hint is recommended when the inner table size is

:37YesOrchid Island Main 15:34:51Oh.Orchid Island Main 15:35:12Other, not quite understand your data in the situation, not very good fine optimization.Orchid Island Main 15:35:44Should still be quick.Snow Leopard 15:36:34GoodSnow Leopard 15:36:36Let me seeOrchid Island Main 15:37:16For example: The index of the other two tablesSnow Leopard 15:37:31WellOrchid Island Main 15:37:43The full table scan, although the table is small, but to 0.5s, should also be a small proportion.Snow Leopard 15:37:55I

Tags: establishing operations common Invalid database index characters NULL join exist Establish an appropriate index (refer to "pose for proper database indexing") Replace or with union (for indexed columns) Replace in, not exist with exist, not Do not declare numbers in character format (invalidates the index, resulting in a full table scan) Do not use SELECT * (List each column after select) Do not perform calculations in join and WHERE clauses (t

Label:Objective About SQL Server Tuning series is a huge content system, not a word two words can be analyzed clearly, this article first in the SQL tuning in the most commonly used query plan to parse, to do a good job of the basic grasp, tamping basic skills! Then we talk about the overall statement

weeks data in tens of millions of.Lan Hua Main 16:13:22Ok.Orchid Island Main 16:16:29So change the SQL:with T1 as (Select count (t.c1), t.c1,t.c2,t.c3,t.c4,t.c5From Tab1 twhere T.c2 not in (' Val1 ', ' val2 ', ' val3 ', ' val4 ', ' VAL5 ')and C1 is not NULLGroup by T.C1, T.C2,T.C3,T.C4,T.C5)Select T1.c1,t1.c2,t1.c3,t1.c4,t1.c5from T1Where NOT EXISTS (Select/*+ Use_hash (m,n) */M.C1, M.C2,M.C3,M.C4,M.C5from T1 m,tab2 Nwhere N.c2 > Sysdate-14and m.c1 = N.c1and t1.c2 = M.C2);Orchid Island Main 16:

can avoid Key lookup is perfect, let's revise non-clustered index to include it in the index with the Include keyword His fields are:[SQL] DROP INDEX idx_non_clust_salesorddetaildemo_modifieddate on salesorddetaildemo GO CREATE nonclustered INDEX idx_non_clust_salesorddetaildemo_modifieddate on salesorddetaildemo (ModifiedDate) INCLUDE ( ProductID, UnitPrice ) GO --Clear the cache, only for the development environment! DB

one index option. Therefore, you should check each index on the current query object to ensure that Oracle uses the best index.Materialized aggregation operations are calculated in a static tableSQL Access advisor, one of the 10 Gb features of Oracle, provides recommendations for indexing and materialized views. Materialized views can be used to pre-connect tables and pre-Digest Table data. (Translator)Oracle can update the data in the materialized v