Cursor for updating table in sql oracle


26-Sep-2019 01:16

cursor for updating table in sql oracle-39

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In this scenario, the cursor result set can be limited using the traditional When we associate a SELECT statement with more than one table joined together to a cursor with a FOR UPDATE clause, we end up locking all the tables in the FROM clause of the SELECT statement, where we just need to lock a single table for our purpose.The FOR UPDATE OF clause helps us in locking up the intended table rather all available tables.create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL primary key, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created.

Hi Tom, Great to visit ask tom site i'm keep on learning oracle things here. i have loaded with "SRC_key = 16" new source data into tables which we used in this view. Short question: If I delete cca 3M entries from table of cca 6.5 rows (and 19 columns), would it be beneficial to re-index? Hello, I want to use TDE tablespace encryption on my database.Thus, any TCL operation on the cursor record set has to be done only after fetching all the rows from the cursor context area using a loop process similar to the above listing example.The row limiting clause introduced in the Oracle version 12c, Fetch First ..Rows Only does not seem to work with the FOR UPDATE clause.

When the Fetch clause is used with a cursor having a FOR UPDATE clause, the PL/SQL unit fails when we try to open the cursor with an ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY, etc. The error description shows that the internal mechanism for the Fetch clause uses either a DISTINCT or a GROUP BY clause which is not permitted alongside the FOR UPDATE clause.Once we open a cursor having a FOR UPDATE clause, all the rows returned by the SELECT statement are locked for our changes until a commit or a rollback is placed to release the lock.



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