new sql capabilities in oracle database 10 g geoff lee, principal product manager peter linsley,...
TRANSCRIPT
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New SQL Capabilities in Oracle Database 10g
Geoff Lee, Principal Product Manager
Peter Linsley, PMTS
Oracle Corporation
Session id: 40088
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Agenda
Overview New Features Demo Summary Q&A
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Oracle8
Evolution of Oracle SQL Engine
Oracle8i Oracle9i Oracle9i R2
SQL /XML Integration
(XMLType, URIType, etc.) OLAPDatetime Types
ANSI Joins
CASE Expressions
XML DBSQL/XMLW3C StandardsData Mining
GridWeb ServicesRegular ExpressionsNative NumbersBLASTExpression Filter
Objects Extension
Data Cartridges
SQL/Java Integration
interMedia Types
Dat
a an
d P
roce
ssin
g c
om
ple
xity
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Oracle SQL Engine Architecture
Optimizer
Query Engine
Index Engine
Type Manager
Exten
sibility
Text
Text
SpatialUtilities Tools
Image
Image
Text
Spatial
Image
Data CartridgesSpatIal
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Agenda
Overview New Features
– Regular Expressions– Native Numbers– LOB Enhancements– Collection Enhancements
Demo Summary Q&A
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Introduction to Pattern Matching
Pattern matching and manipulation– Match 'abc', match email address, etc
LIKE often not expressive enough Non-native and client solutions have
drawbacks
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Introduction to Regular Expressions
Origins in mathematics First computerized in UNIX
– From ed, grep, perl, cgi, web, to everywhere
Multitude of applications– Validation in HTML FORMS – Bioinformatics– Server configuration– Datamining
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Oracle Regular Expressions
Native support to the database– Interfaces in SQL and PL/SQL– Based on POSIX standard– Sync with GNU, PERL, Java, XQuery, etc.
Patterns describing data become a property of the data
Powerful string manipulation within the database
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Enhanced Data Flow
Validate and Format
Filter and Format
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Key Features
POSIX Extended Regular Expressions Interfaces
– REGEXP_LIKE does pattern match?– REGEXP_SUBSTR what does it match?– REGEXP_INSTR where does it match?– REGEXP_REPLACE replace what matched.
Match options Locale Support LOB Support
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. match any character
a? match 'a' zero or one time
a* match 'a' zero or more times
a+ match 'a' one or more times
a|b match either 'a' or 'b'
a{m,n} match 'a' between m and n times
[abc] match either 'a' or 'b' or 'c'
(abc) match group 'abc'
\n match nth group
[:cc:] match character class
[.ce.] match collation element
[=ec=] match equivalence class
MetacharactersOperator DescriptionOperator Description
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REGEXP_LIKE
Determine whether pattern exists Find variations on the name 'Jon Stevens'
– John or Jon– Steven or Stevens or Stephen or Stephens
SELECT c1 FROM t1 WHERE REGEXP_LIKE(c1, ‘Joh?n Ste(ph|v)ens?’); Jon Stevens John Stephens John Stevens
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REGEXP_SUBSTR
Determine what text matched Extract matching variation
SELECT REGEXP_SUBSTR( ‘I am the real Jon Stevens’, ‘Joh?n Ste(ph|v)ens?’) FROM dual; Jon Stevens
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REGEXP_INSTR
Find out where the match occurred Find the matching word
SELECT REGEXP_INSTR( ‘I am the real Jon Stevens’, ‘Joh?n Ste(ph|v)ens?’) FROM dual; 15
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REGEXP_REPLACE
Replace matching text Supports back references in replacement text Fix alternative spellings
SELECT REGEXP_REPLACE (‘I am the real John Stephens.’, ‘Joh?n Ste(ph|v)ens?’,
‘Jon Stevens’) FROM t1; I am the real Jon Stevens.
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Using with DDL
Filter allowable data with check constraint– ZIP code column is VARCHAR2(5) but can hold
any 5 characters.
Query subset and format with views– format phone number to (xxx) xxx-xxxx
Create functional based index
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Using with PL/SQL
Very powerful string manipulation abilitiessrc := REGEXP_REPLACE (src, ‘<regexp_1>’);src := REGEXP_REPLACE (src, ‘<regexp_2>’);
src := REGEXP_REPLACE (src, ‘<regexp_3>’);
Can enhance on existing abilities– Support PERL shorthand– Extract nth subexpression
Replace hundreds of lines of code– String manipulation functions can be simplified
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Performance Considerations
Pattern matching can be complex– Need to compile to state machine– Lex and parse– Examine all possible branches until match found
Compiled once per statement– Can be faster than LIKE for complex scenarios– Usually faster than PL/SQL equivalent
ZIP code checking 5 times faster
Write fast performing expressions.
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Agenda
Overview New Features
– Regular Expressions– Native Numbers– LOB Enhancements– Collection Enhancements
Demo Summary Q&A
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Native Floating-Point Data Types
Two new numeric data types BINARY_FLOAT, BINARY_DOUBLE
– IEEE 754 Standard for binary floating point arithmetic
– Part of numerous other standards (e.g, Java, XML Schema) and hardware platforms
– Prevalent in Business Intelligence, Life Sciences, Engineering/Scientific Computation, etc.
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Native Floating-Point Data Types vs. Number Data Type
More efficient than the NUMBER type– Hardware arithmetic/math are 5 – 10 times faster– Take up less space in memory/disk (5/9 vs. 1 –
22 Bytes each)– BINARY_DOUBLE has wider value range (e308
vs. e125)– No type convesion (use a byte-order neutral
storage format)
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Native Floating-Point Functions
New type conversion functions– TO_BINARY_FLOAT, TO_BINARY_DOUBLE– TO_NUMBER
SQL function support– Numberic functions (sin, cos, etc.)– Aggregate functions (sum, avg, stddev, etc.)– Analytic functions (sum, avg, stddev, etc.)
Seamless support in SQL, PL/SQL, Java, XML Schema registration, ODP.NET and OCI/OCCI
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Native Floating Point Constraints
create table floating_point_table1 (fltNnull binary_float constraint flt_null not null,dblNnull binary_double constraint dbl_null not null,fltUnq binary_float constraint flt_unq unique,dblUnq binary_double constraint dbl_unq unique,fltChk binary_float constraint
flt_chk check ( fltChk is not NaN ) ,dblChk binary_double constraint
dbl_chk check ( dblChk is not infinite) ,
fltPrm binary_float constraint flt_prm primary key);
* NaN (Not a Number) – e.g. 0/0, infinity/infinity
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Native Floating Point Constraints
create table floating_point_table2 (dblPrm binary_double constraint
dbl_prm primary key,fltFrn binary_float constraint flt_frn references
floating_point_table1(fltPrm) on delete cascade);
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Agenda
Overview New Features
– Regular Expressions– Native Numbers– LOB Enhancements– Collection Enhancements
Demo Summary Q&A
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LOB Enhancements LOBs are prevalent in storing
unstructured data (text, AVI, genomic/proteomic sequences, etc.)
Implicit charset conversion Between CLOB and NCLOB
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LOB Performance Improvements
5x performance gain for accessing inline (< 4KB) LOBs
Temporary LOBs uses reference counting to provide orders of magnitude performance gain
– Reference on Read– Copy on Write
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Ultra-Sized LOBs
Terabyte (8 – 128 TB) sized Lobs– DB_BLOCK_SIZE (2 – 32 KB) x (4GB –1)– New DBMS_LOB.GET_STORAGE_LIMIT
function– OCI, JDBC, and DBMS_LOB now
supports LOBs greater than 4GB OCILobRead2(), OCIWriteAppend2(), and
OCILobWrite2() functions Same APIs for JDBC and DBMS_LOB
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Data Interface for Persistent LOBs
Client DML (insert/update) can bind char buffers (up to 4GB) to LOB values without the locator
– OCI, JDBC, and ODP.NET support– Up to 32KB with PL/SQL
No server round-trip to get the locator before insert/update
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Datetime Enhancements The best implementation of ANSI SQL
timestamp with (local) time zone– Expanded region time zone names support
Default: $ORACLE_HOME/oracore/zoneinfo/timezone.dat (146 KB)
Larger set: ORACLE_HOME/oracore/zoneinfo/timezlrg.dat (380 KB)
– ORA_TZFILE specifies the file used by the database
– Loaded into SGA during instance startup– Valid region names are listed in
v$timezone_names
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Agenda
Overview New Features
– Regular Expressions– Native Numbers– LOB Enhancements– Collection Enhancements
Demo Summary Q&A
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Collection Types Enhancements User-defined types, collection types,
and Ref type simplify complex-structured data modeling
Collections types are used for mapping containment relationships in real world applications
– For example, a shopping cart contains a number of items
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VARRAY Enhancements Type evolution of VARRAYs
CREATE TYPE email_list_typ AS OBJECT ( section_no NUMBER, emails email_list_arr);/CREATE TYPE email_varray_typ AS VARRAY(5) OF
email_list_typ;/ALTER TYPE email_varray_typ MODIFY LIMIT 100
CASCADE;
Support VARRAY columns in temporary tables– Provides application development flexibility
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Nested Table Enhancements
Use a different tablespace for a Nested Table’s storage table
– Tables with Nested Table columns can distribute I/O load among tablespaces
CREATE TABLE purchase_orders ( order_items_column order_items_typ )NESTED TABLE order_items_columnSTORE AS order_items_column_nt (TABLESPACE
users);
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ANSI SQL Multiset Operations for Nested Tables A Nested Table stores unordered
elements– A set contains only unique
elements– A multiset can contain duplicate
elements
Full range of Multiset operations on Nested Tables
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Multiset Operations for Nested Tables Cardinality, Collect, Multiset Except, Multiset
Intersection, Multiset Union, Powermultiset, Powermultiset_by_Cardinality, and Set operations
– Powerful tools to find frequent item sets (market basket analysis)
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Multiset Operation Examplecreate type categories as table of int;/ create table carts (c1 int, c2 categories)
nested table c2 store as tb1_c2; insert into carts values(1, categories(1,2,3,4));insert into carts values(2, categories(2,4,6)); select t1.c2 multiset intersect t2.c2 from carts
t1, carts t2 where t1.c1=1 and t2.c1=2;
categories(2,4) <- frequent set
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Comparisons of Nested Tables
Equal and Not Equal, In, Submultiset, Member Of, Empty, and Is [Not] A Set
SELECT * FROM customer cWHERE item_typ(2) MEMBER OF c.freq_set;
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Agenda
Overview New Features Demo Summary Q&A
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D E M O N S T R A T I O N
SQL for Data Grids
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Aggregated Information
Web Service
JDBC/JXQISOAP
XQuery EngineAggregated Information
EISOracle SQL
Engine
HTTP/SOAP
J2EETM CA
Streams
HeterogeneousServices
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XQuery FLWOR Expressions A FLWOR (flower) expression binds some
expressions, applies a predicate, and constructs a new result.
FOR var IN expr
LET var := expr WHERE expr
RETURN expr
FOR and LET clauses generate a list of tuples of bound expressions
WHERE clause applies a predicate, eliminating some of the tuples
RETURN clause is executed for each surviving tuple, generating a list of outputs
ORDER BY expr
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Agenda
Overview New Features Demo Summary Q&A
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Summary
Oracle Database 10g SQL engine – Data Grid information aggregation from diverse
and distributed data sources– Seamless integration with Java, XML, and
essential data processing capabilities– A comprehensive set of high-performance and
standards-based (SQL-2003, W3C, J2SE, POSIX, etc.) features
– Simplified application development, deployment, and management
– RAS, manageability, and security
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Next Steps….
Relevant web sites to visit for more information– http://otn.oracle.com/products/database/
application_development/– OTN SQL/PL-SQL discussion forum– http://otn.oracle.com/tech/xml/xmldb/htdocs
/xquery.html
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Reminder – please complete the OracleWorld online session survey
Thank you.
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AQ&Q U E S T I O N SQ U E S T I O N S
A N S W E R SA N S W E R S
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