oracle index hint

Oracle forced index using HINT First of all, it depends on whether your Oracle optimizer uses RBO or CBO,(1) If RBO is used, it will be performed in the Rule Order.(2) If CBO is used, you can use the HINT method to modify it. Syntax:SELECT/* +

Oracle forced index using HINT, oraclehint First of all, it depends on whether your Oracle optimizer uses RBO or CBO,(1) If RBO is used, it will be performed in the Rule Order.(2) If CBO is used, you can use the HINT method to modify it. Syntax:SELECT/* +

Turn from: Use of Oracle index hintThe distribution of data stored in the database is clearer than the Oracle optimizer, where the optimizer cannot make the most of the query path selection, using the hint (hint) artificial fixed query path to a certain extent to generate a

Label:Use hint to force a specified index when the Oracle Optimizer is unable to use a reasonable index.To continue the example of Oracle performance optimization operation VII, Oracle defaults to the fact that the values of the columns in the table are evenly distributed ac

specified table, which is only valid for the cluster object.For example:SELECT/* + CLUSTER */BSEMPMS. EMP_NO, DPT_NO from bsempms, BSDPTMSWHERE DPT_NO = 'tec304 'and bsempms. DPT_NO = BSDPTMS. DPT_NO;8./* + INDEX (TABLE INDEX_NAME )*/Indicates the method used to scan the selected index on the table.For example:SELECT/* + INDEX (BSEMPMS SEX_INDEX) USE SEX_INDEX b

Original: SQL Server Tuning Series play turn three (use index hint (Hint) to boot statement maximum optimization run)ObjectiveThis article continues to play the content of the module, about the location of the index in SQL Server No need to say, this article will analyze how to use the

Label:ObjectiveThis article continues to play the content of the module, about the location of the index in SQL Server No need to say, this article will analyze how to use the Hint Bootstrap statement to fully use the index to run, as well as a solid grasp of the previous series of content before entering the content analysis of this module.Gossip, enter the cont

ObjectiveThis article continues to play the content of the module, about the location of the index in SQL Server No need to say, this article will analyze how to use the Hint Bootstrap statement to fully use the index to run, as well as a solid grasp of the previous series of content before entering the content analysis of this module.Gossip, enter the content of

always access the target partition index on the target table in parallel with the default parallelism calculated based on the relevant system parameters. Here the optimizer may make some adjustments to the computed default parallelism, that is, the actual degree of parallelism of the target SQL using format 2 is not necessarily the default degree of parallelism for the current system.You can specify multiple target indexes in Parallel_index

Tags: Oracle performance optimization To use parallel hint on a non-partitioned index:The following full table scan parallel hint can take effect: Sql>select/*+full (Dept) parallel (DEPTNBSP;2) */deptnofromdept; Executionplan----------------------------------------------------------planhashvalue: 587379989--------------------------------------------

When we want a query to take advantage of an index, we typically add an index hint to the query, like this Copy Code code as follows: SELECT Id,name from TB with (index (Ix_xttrace_bal)) where bal In a production environment, the optimizer generally does not consider other indexes because of the reas

{ "ok" : 0.0, "errmsg" : "WiredTigerIndex::insert: key too large to index, failing 1483 { : \"Shandong partition | Shandong partition manufacturers | Shandong partition price | Shandong activity partition | Shandong hotel activity partition | Yantai activity glass partition | Shandong activity board |Shandong separated??...\" }", "code" : 17280 } MongoDB would not create an index on a colle

PHP hint notice:undefined index problem, Undefined index: refers to the existence of your code: "Variables are not defined, assigned to use" error, this is not a fatal error, will not let your PHP code run forcibly aborted, but there is a potential problem of the danger ......Occurs when reading data:Notice:undefined Index:name in ...Notice:undefined Index:key in

Although it is possible to hide this hint by setting the error display, there is a hidden danger that these prompts are logged in the server's log, causing the log file to be unusually large Usually use $_post['],$_get['] to get the parameters in the form will appear Notice: Undefined index:--------; We often receive forms POST the data Times undefined index err

Oracle compound index + null index usage problems, oracle Index Yesterday, I discussed an SQL Optimization Problem in the QQ group. The statements are roughly as follows: Select A, min (B) from table group by;-- Neither A nor B has the not null constraint. Column A has no

Tags: des blog http io ar os using SP forHttp://www.cnblogs.com/sopost/archive/2010/10/11/2190076.html in the SQL statement optimization process, we often use the hint, now summarize the SQL optimization process common Oracle Usage of hint:1./*+all_rows*/Indicates that the cost-based optimization method is selected for the statement block, and the optimal through

Oracle Performance Analysis 5: Index Structure and scan mode of data access methods, oracle Index The previous article describes full scan. This article describes the index structure and scan methods, and describes each scan method later.When

Oracle-specific index type resolution, oracle-index resolution2.1 B-tree index (default type)The B-tree index is a common index in Oracle. W