The ORDERED hint causes Oracle to join tables in the order in which they appear in the FROM clause.If you omit the ORDERED hint from a SQL statement performing a join, then the optimizer chooses the order in which to join the tables. You might want to use the ORDERED hint to specify ...
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In a time critical situation, one such alternative is the "SQL Patch". The SQL patch allows a user to "insert hints" into a query whose text cannot be edited due to the application constraints using an undocumented API called DBMS_SQLDIAG_INTERNAL.I_CREATE_PATCH(). This undocumented ...
Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
在多表联合查询中,当使用Ordered提示改变SQL执行计划之后,通常我们很难再次控制结果集中进一步Join的顺序. 这时候我们可以使用Oracle提供的另外一个Hints: Leading 提示. 这个Hints在Oracle9i中的含义为: TheLEADINGhint causes Oracle to use the specified table as the first table in the join order. ...
We also don’t want to discuss what hints make sense and which do not. In this article we just want to explain the mechanics of adding different hints for SQL Server to ABAP code.Especially for cases where customers move from Oracle to SQL Server, there is one very significant differenc...
"Simple" SQL to check for alpha or numeric charcters isn't working right "String or binary data would be truncated.\r\nThe statement has been terminated." "String or binary data would be truncated" and field specifications “Unable to enlist in the transaction” with Oracle linked serve...
Use the ANALYZE command to collect statistics that can be used by Oracle to implement a cost-based approach to SQL statement optimization. You can supply additional "hints" to the optimizer as needed. Call the DBMS_APPLICATION_INFO.SET_ACTION procedure before beginning a transaction to register ...
Use theANALYZEcommand to collect statistics that can be used by Oracle Database to implement a cost-based approach to SQL statement optimization. You can supply additional "hints" to the optimizer as needed. Call theDBMS_APPLICATION_INFO.SET_ACTIONprocedure before beginning a transaction to register...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source nam...