Db2 cursor insensitive. So use this if the requirement really demands it.


  1. Db2 cursor insensitive. We will see how and where the INSENSITIVE feature is shown below. . To prevent cursors from closing after commit operations, declare your scrollable cursors WITH HOLD. You can define a cursor as INSENSITIVE in a DECLARE CURSOR statement that is used in a compound SQL (compiled) statement. The following table lists the fetch orientation keywords that you can specify and their meanings. Close sensitive scrollable cursors that as soon as they are no longer needed. Using a cursor is like keeping your finger on a particular line of text on a printed page. Learn the key differences between sensitive and insensitive scrollable cursors in SQL, along with syntax examples to enhance your database programming skills. Sep 6, 2019 · Notes: Scrollable cursors need more DB2 processing than Normal Cursors. In this case, the cursor must be defined INSENSITIVE or ASENSITIVE. In most cases the SELECT statement requires Db2 to build a temporary table or work file with the result table of the cursor, and Db2 cannot guarantee that changes made outside the cursor will be visible. These keywords apply to both row-positioned scrollable cursors and rowset-positioned scrollable cursors. If you specify the STATICREADONLY INSENSITIVE option for the DB2_SQLROUTINE_PREPOPTS registry variable or the SET_ROUTINE_OPTS The cursor, cursor-name, is defined as SENSITIVE, but the content of the SELECT statement makes the cursor read-only. Using a cursor enables controlled row-by-row data access, critical for COBOL applications that perform complex processing on each row of data. By default, cursors are moved by 1 row at a time in the result table in sequential order starting from the first row. Specifies that the cursor does not have sensitivity to insert, update, or delete operations that are made to the rows underlying the result table. If you specify the STATICREADONLY INSENSITIVE option for the DB2_SQLROUTINE_PREPOPTS registry variable or the SET_ROUTINE_OPTS Scrollable and non-scrollable cursors: When you declare a cursor, you tell Db2 whether you want the cursor to be scrollable or non-scrollable by including or omitting the SCROLL clause. INSENSITIVE Specifies that the cursor does not have sensitivity to inserts, updates, or deletes that are made to the rows underlying the result table. As a result, the size of the result table, the order of the rows, and the values for each row do not change after the cursor is opened. As a result, the size of the result table, the order of the rows, and the values for A FETCH INSENSITIVE on a SENSITIVE STATIC SCROLL cursor is not sensitive to changes made outside the cursor, unless a previous FETCH SENSITIVE has already refreshed that row; however, positioned updates and delete changes with the cursor are visible. Checking whether the Updates made by other Starting with Version 9. Specifies the cursor is not sensitive to insert, update, or delete operations performed on the database table after the result table is created. Once defined, it enables the program to retrieve and work with one row at a time. You can enable insensitive cursors by setting the DB2_COMPATIBILITY_VECTOR registry variable to hexadecimal value 0x1000 (bit position 13), and then stop and restart the instance to have the new setting take effect. Db2 has a mechanism called a cursor. 7 Fix Pack 2 and later fix packs, you have the option of making cursors insensitive to subsequent statements by materializing the cursor at OPEN time. So use this if the requirement really demands it. What is a Cursor in DB2 Mainframe? A cursor in DB2 is a database object that acts as a pointer to the result set of a query. Those are - A fetch orientation keyword indicates the absolute or relative position of the cursor when the FETCH statement is executed. If INSENSITIVE is specified, the cursor is read-only and the result table is materialized when the cursor is opened. Usage of SENSITIVE & INSENSITIVE in scrollable cursors also affects the performance. The . This clause determines whether the cursor moves sequentially forward through the result table or can move randomly through the result table. To remove this limitation SCROLL clause is used to indicate whether the cursor moves sequentially through the result table or can move randomly through the result table. If it is coded, the cursor is read-only, and the result table is formed when the cursor is opened. Sensitive scroll cursor is the cursor that is sensitive to insert, update, or delete operations performed on the database table after generating the result tab Every cursor in the DB2 falls under any one of the above two categories. The DECLARE CURSOR statement defines a cursor. Data modification statement based cursors - Modifying or deleting rows from the database table separates the cursors into two categories. May 6, 2014 · To start with we will see first what is an insensitive cursor. Use the following methods to prevent false out-of-space indications: Check applications such that they commit frequently. If there is a requirement to Scroll thru the result table and this can not be achieved effectively by using Normal cursors then go for it. If you bind a package with the STATICREADONLY INSENSITIVE parameter of the BIND command, all read-only and ambiguous cursors are insensitive. Let us see how the keyword 'INSENSITIVE' is used to declare this type of cursor. INSENSITIVE can only be specified for cursors declared as INSENSITIVE or SENSITIVE STATIC (or if the cursor is declared as ASENSITIVE and Db2 defaults to INSENSITIVE). o0jny 9pu0 zeg tyauj hiou 0t5lbv6 bget5 1yc tecmp tv