new features of oracle 11g - aioug & proprietary 4 features of 11g following are the oracle...
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New Features of Oracle 11g
By
Beena V T
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AGENDA
• Features of 11g
• 11g Features in detail
• Key Points - Coding PL/SQL program.
• Questions and Answers
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Features of 11g
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Features of 11g
Following are the Oracle Features of 11g
Virtual Column
REGEXP_COUNT function
Inline Pragma
New PLSQL compiler warning
PLSQL sub-program invocation
Restrictions in FORALL
Type with force option
Generalized Invocation
Trigger Enhancements
Fine grained dependency tracking
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Virtual Column
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Virtual Column
A column value is derived from an expression.
Oracle doesn't store any data related to virtual column.
Only expression is stored in data dictionary.
Virtual columns can be referenced in the WHERE clause.
Index-organized, external, object, cluster, temporary tables not supported
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Virtual Column – An Example
Virtual Column
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Virtual Column
The expression used in the virtual column definition has the following
restrictions:
It cannot refer to another virtual column by name.
It can only refer to columns defined in the same table.
If it refers to a deterministic user-defined function, it cannot be used as
a partitioning key column.
Cannot return an Oracle supplied, user-defined, or LOB or LONG
RAW.
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REGEXP_COUNT function
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REGEXP_COUNT Function
REGEXP_COUNT function returns number of times a pattern occurs in a source
string.
Syntax: REGEXP_COUNT(source_char,pattern, position, match_param)
SOURCE_CHAR is a character expression which is the search value.
PATTERN is the regular expression, which will be matched
POSITION is a positive integer from where search should begin
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REGEXP_COUNT – An Example
MATCH_PARAM is a text literal, controls matching behavior.
'i' specifies case-insensitive matching.
'c' specifies case-sensitive matching.
'n' allows a period (.) wild character to match a newline
'm‘ parses the source string as individual lines
'x' ignores whitespace characters.
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MATCH_PARAM is a text literal, controls matching behavior.
• 'i' specifies case-insensitive matching.
• 'c' specifies case-sensitive matching.
• 'n' allows a period (.) wild character to match a newline
• 'm‘ parses the source string as individual lines
• 'x' ignores whitespace characters.
Source_Char
Pattern
Position
Match_Param
REGEXP_COUNT – An Example
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Inline Pragma
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INLINE Pragma –Example 1
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INLINE Pragma
Every call to a procedure or function causes performance overhead.
This is noticeable when subprogram is called within a loop.
Avoiding procedures and functions is not an option.
Automatic subprogram inlining can reduce the overheads associated.
Replaces subprogram calls with a copy of the code at compile time.
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INLINE Pragma
Subprogram inlining controlled by PLSQL_OPTIMIZE_LEVEL
When PLSQL_OPTIMIZE_LEVEL=2 (the default).
PLSQL_OPTIMIZE_LEVEL=3, may inline code automatically.
INLINE pragma can turn on/off inlining.
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INLINE Pragma – Example 2
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INLINE Pragma – Example 2
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INLINE Pragma – Example 3
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INLINE Pragma Example 3
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INLINE Pragma
The INLINE pragma only affects the following types of statements,
• Assignment
• Call
• Conditional
• CASE
• CONTINUE-WHEN
• EXECUTE IMMEDIATE
• EXIT-WHEN
• LOOP
• RETURN
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Compiler Warning
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Compiler Warning
Before11g,
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Compiler Warning
In 11g, warning when exception handlers do not re-raise errors.
Note: This is only a warning message, so it only identifies
possible problem code, it doesn't prevent it.
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Compiler Warning
In 11g, warning when exception handlers do not re-raise errors.
Note: This is only a warning message, so it only identifies
possible problem code, it doesn't prevent it.
Warning
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Sub-Program Invocation
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PL/SQL Subprogram Invocations
Prior to 11g, only positional notation is allowed.
Oracle 11g allows positional, named and mixed notation.
Positional
Mixed
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Restrictions in FORALL
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FORALL Restriction
Before11g,
Update Entire
Row
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FORALL Restriction
In 11g, PLS-00436 restriction has been removed.
Columns can be referenced in SET and WHERE clauses of DML statements.
Update Selected
Column
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FORALL Restriction
SET and WHERE clauses contain references to individual columns in collection.
Using bulk-binds for DML is made easier.
Improved performance on update operation
No need to use ROW keyword, no longer whole row update required
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Type with force option
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Creating TYPE OBJECT,
Creating TYPE TABLE with OBJECT,
TYPE with FORCE option
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Try Altering TYPE OBJECT without FORCE option,
With FORCE option,
TYPE with FORCE option
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TYPE with FORCE option
Before11g, cannot replace type, with type or table dependencies.
In 11g, FORCE is used to overcome this issue
Applies to objects, varrays, and nested table types.
Also applies to inheritance in types.
Table dependencies still cause errors.
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Generalized Invocation
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Generalized Invocation
Allows a subtype to invoke a method of a parent type (supertype).
Syntax:
Example:
Step 1: Create type with some attribute and member function
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Generalized Invocation
Step 2: Create a subtype of this object, as below,
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Generalized Invocation
Step 3: Access method of parent type by calling subtype.
Note: Member functions of parent type can be invoked,
regardless of the depth of inheritance.
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Trigger Enhancements
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Execution Order – An Example
Before 11g,
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Execution Order
More than one trigger can be created for the same timing point.
In 10g, execution order of those triggers not guaranteed.
Oracle 11g now includes FOLLOWS clause to guarantee execution order.
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Execution Order – An Example
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Execution Order – An Example
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Compound Triggers
Allows code for one or more timing points to be combined into a single trigger.
The individual timing points can share a single global declaration section
Once a statement ends, trigger state is cleaned up.
Triggering actions are defined in the same way as any other DML trigger.
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Compound Triggers
Main body of the trigger has an optional global declaration section.
Each timing point sections contains a local declaration section.
Compound
Trigger
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Enable/ Disable Triggers
Triggers can be Enabled or Disabled explicitly at the time of creation in 11g
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Fine grained dependency
tracking
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Fine Grained Dependency
If referenced Object's Structure or definition is modified,
In Conventional Dependency Model,
• Dependent object will be marked "invalid' in data dictionary.
In New Dependency Model in 11g,
• Dependencies across objects can be tracked down up to object level.
Fine Grained Dependency is the one of key enhancement in Oracle 11g.
In 11g, object dependency concept moved from Object level into column level .
This will assure the minimum hindrance object Validation.
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Q & A
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Thank You