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How to update records without invalidating cursor oracle

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In the first, a variable is declared in the outer block and is referenced successfully in a nested block.

In the second, a variable is declared in a nested block and referenced from the outer block, resulting in an error as the variable is out of scope.

By caching the results of queries, Oracle can avoid having to repeat the potentially time-consuming and intensive operations that generated the resultset in the first place (for example, sorting/aggregation, physical I/O, joins etc).

The cache results themselves are available across the instance (i.e.

I haven't explicitly tested UPDATE and DELETE statements, but the assumption is that they are affected, too.

The behaviour is documented in the following note on MOS: "Insert Statement On Partitioned Tables Is RE-Started After Invalidation (Doc ID 1462003.1)" which links to Bug "14102209 : INSERT STATEMENT' IS RESTARTING BY ITSELF AFTER INVALIDATION" where you can also find some more comments on this behaviour.

The optional declaration section allows variables, types, procedures and functions do be defined for use within the block.This article examines this view and a few other related ones, focusing on characteristics that may surprise us.Please note that the "Object" in this article is not related to "object-oriented" database or programming, but rather to the database object such as a table or view.It's probably not that well known that Oracle can actually rollback / re-start the execution of a DML statement should the cursor become invalidated.By rollback / re-start I mean that Oracle actually performs a statement level rollback (so any modification already performed by that statement until that point gets rolled back), performs another optimization phase of the statement on re-start (due to the invalidation) and begins the execution of the statement from scratch.The columns OWNER and OBJECT_NAME of DBA_OBJECTS are self-explanatory.Although the OBJECT_NAME is documented to be a VARCHAR2 column of length 30 characters (even in the Oracle Database 11g Documentation), since at least Oracle8i, this column has been of data type VARCHAR2 with a length of 128!The scope of these declarations is limited to the code within the block itself, or any nested blocks or procedure calls.The limited scope of variable declarations is shown by the following two examples.The issue seems to be that Oracle at that point is no longer sure if the partition information compiled into the cursor for the partitioned target table is still correct or not (and internally raises and catches a corresponding error, like "ORA-14403: Cursor invalidation detected after getting DML partition lock", leading to the re-try), so it needs to refresh that information, hence the re-optimization and re-start of the cursor.Note that this also means that the DML statement might already have performed modifications to other partitions but after being invalidated attempts to modify another partition it hasn't touched yet - it just needs an attempt to modify a partition not touched into yet by that statement.