SQL Plan Management, Part 3 Database. Journal. com. Synopsis. Oracle Database 1. R1 offers a new tool set, SQL Plan Management SPM, that. Oracle DBA capture and preserve the most efficient execution plans for. SQL statement. The final article in this series illustrates how to use SPM. SQL statement performance before. Oracle 1. 1gs cost based optimizer. It also. reveals several SQL Plan Management features that allow extremely granular. SQL Management Base SMB. Sql Optimizer Tool For Mysql' title='Sql Optimizer Tool For Mysql' />The previous. Oracle Database 1. SQL Plan Management SPM features can be. SQL Plan Baselines for Oracle 1. Sql Optimizer Tool For Mysql' title='Sql Optimizer Tool For Mysql' />Views are a valuable tool for the SQL Server Developer, because they hide complexity and allow for a readable style of SQL expression. They arent there for reasons. 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Tune SQL like a pro with DB Optimizer, IDERAs SQL database optimization tool, which offers performance optimization suggestions, visual tuning diagrams and more. Synopsis. Oracle Database 11gR1 offers a new tool set, SQL Plan Management SPM, that lets any Oracle DBA capture and preserve the most efficient execution plans for. The 1 SQL Server community and education site, with articles, news, forums, scripts and FAQs. MdofCC' alt='Sql Optimizer Tool For Mysql' title='Sql Optimizer Tool For Mysql' />This tutorial explains how to backup the information from your MySQL databases and restore it when needed. MySQL Export How to backup your MySQL databaseSQL statements for new application code would choose the most efficient. This. article the final one in this series will show how to use SPM to Limit. SQL statements when they attempt to take. Oracle 1. 1g optimizer features. Capture SQL. Plan Baselinesfor specific SQL. Control the. evolution of existing SQL Plan Baselines. Manage the. contents of the SQL Plan. Management Baseline SMB, including how to purge obsolete or undesired SQL Plan. Baselines. SPM Scenario 3 Using SQL Performance Analyzer SPA Against Prior Optimizer Versions. The first. scenario  in the prior article. SPM could be used to capture SQL Plan Baselines for SQL. Oracle 1. 0g to Oracle 1. That scenario involved actually executing the. SQL Workload on an existing Oracle 1. An. alternate method to solve this issue is to simulate an Oracle 1. Oracle 1. 1g database environment by manipulating the value for. OPTIMIZERFEATURESENABLE. Preparing the Simulation. To illustrate. this scenario, Ill utilize the same SQL statements that I captured earlier. SQL Tuning Set STSSPM2. SPM Scenario. 2 in the previous article. Before I perform any new analyses, however. Ill first remove any SQL Plan Baselines from the SQL Management Base SMB. Ill use function DBMSSPM. DROPSQLPLANBASELINE. SPM2. 3. 1. Then Ill prepare a new SQL. Performance Analyzer SPA task named SPASPM3. SQL workload in the STSSPM2. SQL Tuning Set see Listing. Analyzing SQL Workloads. Next, Ill aim. SPA task SPASPM3. R2 and. an 1. 1g. R1 Oracle database environment. Ill first clear my Oracle 1. Ill then set initialization parameter OPTIMIZERFEATURESENABLE. Oracle 1. 0g database. Finally. Ill analyze the workload in that mode by performing a test execution of the SPASPM3. Once this sequence is completed, Ill then repeat the same. OPTIMIZERFEATURESENABLE to a value of 1. SPA will evaluate the workload in an Oracle 1. The code I used to do this is shown in Listing. Comparing Relative Workload Performance. Once the two workload test executions are complete, my next task is to. SQL statements whose performance would have. I used the code in Listing. SQL statements which had poorer performance. To show the flexibility of SQL Performance Analyzer here, Ive eschewed using a. Ive chosen to compare statements based on estimated execution time. Capturing SQL Plan Baselines for Regressing Statements. As the resulting analysis report shows, two statements would be negatively. Ill capture the execution plans for these statements into SQL Plan Baselines. This will prevent the CBO from running these SQL statements using the 1. The code in Listing. Controlling SQL Plan Evolution. Oracle. 1. 1g has coined the term SQL plan evolution. SQL. statements execution. As I outlined in the first. SPM intercepts a new execution plan. SQL statement that already exists in the SMB, then SPM saves that plan. SMB as part of that SQL statements history however, SPM doesnt permit the plan to be used until its been evaluated for. If SPM determines that the new plan does improve. SPM will then change the plans status to ACCEPTED. This concept, also known as plan. SPMs automatic evolution of SQL. SMB. To. demonstrate these concepts, Ive created a simple SQL statement SPM31. Sales History schema. To create a clean slate against which SPM. Ill first clear any SQL Plan Baselines from. SMB that are tagged with a comment string of SPM and flush both the Library. Cache and Database Buffer Cache, as shown in Listing. Once thats done, Ill use the code shown in Listing. SQL Plan Baseline capture by setting. OPTIMIZERCAPTURESQLPLANBASELINE to FALSE. SQL Plan Baseline manually from the. Library Cache with function DBMSSPM. LOADPLANSFROMCURSORCACHE. Bind Value Peeking and Adaptive Cursor Sharing. Ive. deliberately used bind variables in SQL statement SPM31. SQL. Plan Management interacts with bind variable. The cost based optimizer has been able to take advantage. Oracle Release 9. CBO determine a. more accurate execution plan based on the first set of values that are supplied. Oracle. 1. 1g also introduces a new feature called Adaptive. Cursor Sharing that interacts extremely effectively with bind. The bottom line here is that SPM will. SQL Plan Baseline. If I. re execute the same query but use different values for the bind variables, its. To prevent this, SPM still stores the execution plan as part. SQL statements plan history. SMB, but the new plan wont be used until SPM verifies it as a better plan. Ill expand this discussion. Adaptive Cursor Sharing works. Requesting SQL Plan Baseline Evolution. On. the other hand, what will happen when SPM detects a better plan due to. Ill simulate this scenario by adding an index on the CUSTLASTNAME. SH. CUSTOMERS. table. This index will have a dramatically positive effect on the performance. SQL statement SPM31. SH. CUSTOMERS. table is no longer required to provide the result set. Once Ive reactivated. SQL Plan Baseline capture by setting initialization parameter OPTIMIZERCAPTURESQLPLANBASELINE. TRUE at a session. Ill execute the statement again and verify the resulting SQL Plan. Baseline that is captured. The CBO will compile a new execution plan that will. SMB for this statement see Listing. SPM evolves this new plan. SQL Plan Baseline. When I execute function DBMSSPM. EVOLVESQLPLANBASELINE. Oracle 1. 1gwill immediately evaluate. SQL Plan Baselines and evolve any that result in improved. This function returns a CLOB that lists any SQL Plan Baselines that. Ive. shown the results of this plans evolution in Listing. SQL Plan Baseline will now be utilized. SQL statement is executed, Ive also run an EXPLAIN PLAN. NOTESdirective. Automatic Plan Evolution Via SQL Tuning Advisor. Oracle 1. 1g also provides for automatic evolution of SQL Plan Baselines via the. SQL Tuning Advisor. SQL statements. And. Automatic SQL Tuning AST batch process. SQL Tuning Advisor during its regularly scheduled nightly run. AST can also recommend the acceptance of a SQL Profile whenever that Profile. SQL Plan Baseline. For more. information on Automatic SQL Tuning, see this. Modifying SQL Plan Baseline Attributes. Oracle 1. 1g permits extremely granular. SQL Plan Baselines. Ibm Spss Statistics Crack. To illustrate, Ive prepared three SQL statements. SPM32. sql. Once executed, I captured their execution plans directly from the Library. Cache, loading them into the SMB as SQL Plan Baselines using DBMSSPM. LOADPLANSFROMCURSORCACHE. Lastly. I applied function DBMSSPM. ALTERSQLPLANBASELINE. SQL Plan Baseline. These modifiable. ENABLED. Setting this attribute to its non default value of NO tells Oracle 1. A SQL. Plan must be marked as both ENABLED and ACCEPTED, or the CBO will ignore. Its possible that a SQL Plan Baseline could actually reference more than one.