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Cursor updating table oracle

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For UPDATE and DELETE operations, the cursor identifies the rows that would be affected.

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You can name a cursor so that it could be referred to in a program to fetch and process the rows returned by the SQL statement, one at a time.There are two types of cursors − Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement.Programmers cannot control the implicit cursors and the information in it.When you fetch a row the current row position moves to next row.What I love about writing SQL Tuning articles is that I very rarely end up publishing the findings I set out to achieve. We have a table containing years worth of data, most of which is static; we are updating selected rows that were recently inserted and are still volatile. For the purposes of the test, we will assume that the target table of the update is arbitrarily large, and we want to avoid things like full-scans and index rebuilds.In DB2 you can use WITH HOLD clause in DECLARE CURSOR statement to specify that the cursor remains open when a COMMIT is issued. Oracle does not provide WITH HOLD and WITHOUT HOLD clauses in cursor declaration, but a cursor remains open after COMMIT unless FOR UPDATE is specified.In this chapter, we will discuss the cursors in PL/SQL. A cursor holds the rows (one or more) returned by a SQL statement.A cursor contains information on a select statement and the rows of data accessed by it.This temporary work area is used to store the data retrieved from the database, and manipulate this data.Create a stored procedure like this - assuming that pk is the primary key of table1: for select table1.pk, t2.f1, t2.f2 from table1, t2 where table1= t2into :v_pk, :v_f1, :v_f2 do begin update table1 set f1 = :v_f1, f2 = :v_f2 where table1= :v_pk end; source: Ann Harrison on listserv PL/SQL ORACLE PROCEDURE (WALIKHAN09): DECLARE v_F1 T2. F2%TYPE; /* cursor declaration */ CURSOR c_ct IS SELECT FI, F2 FROM T2; BEGIN OPEN c_ct; LOOP FETCH c_ct INTO v_F1, v_F2; /* if there are no more rows to fetch, exit the loop */ EXIT WHEN c_ct%NOTFOUND;/* UPDATING TABLE */UPDATE T1 a SET a. Have you tuned that SQL statement so that it effeciently pulls the data out of the database? Take the COMMIT out of the loop and see if that helps your performance.