As With any other db/Persistence API , queueing/messaging API must(May
be It should be re-emphasized) support transactional API
and no wonder Oracle AQ supports this.
Set based processing , Enqueueing and Dequeueing array of messages, XML
based payloads
possible with AQ.
While Oracle AQ supports Transactional API in Persistent Queues which it
conveniently leverages the Oracle Database Tables (Queue Tables,IOTs to
be precise)
it was not supporting transactional API in Buffered messages.
EnQueueing and DeQueueing into Persistent Messages have the same
overhead as of doing Select,Insert and/or delete into IOT tables as the
case maybe.
Buffered Messages dont have this overhead with the downside of retention.
Thursday, June 26, 2008
Tuesday, June 10, 2008
Question on "nested txns" vs "autonomous txns"]
For people who have requirements to code a Autonomous txn in Oracle which is called in general as a "Nested Top level (sub)transaction",
Things to watchout are esp in the context of temp tables,
Autonomous transactions just happen in another transaction but within the same session of parent/main txn and so your temp tables/gtt s created in main txn should be accessible from within autonomous txn except for the uncommitted changes done to it in main txn immediately (Infact if you cannot even populate a same gtt/temp table which has been already populated in main txn, you would get error in autonomous txn )
I did some study and found that use of autonmous txn is 99% for auditing/logging purposes and as Thomas Kyte(asktom) says any other use of them is sure a problem in design/code.You would need to really check your logic for such a use case before you decide some txn as a autonomous txn.
I would summarise the following for autonomous and nested txns:
Autonomous Txn:
Nested Txn:
Please see autonomous and nested transaction example.
Autonomous txn Example (In PL/SQL)
create table audit_test
(
name varchar2(20),
join_date date,
identifier varchar2(200),
log_id number
)
/
Truncate table audit_test
/
Create or replace procedure commit_test
is
pragma autonomous_transaction ;
v_nr number;
begin
select nvl(max(log_id),0) into v_nr from audit_test;
dbms_output.put_line('Maximum before autonomous txn In Child:'||v_nr); --(0)Autonomous Child txn wont see uncommitted changes in Parent.
insert into audit_test values('laksA',sysdate-1,'TestA',2);
commit; --Autonomous Child txn has to a commit/rollback always
end;
/
declare
v_nr number ;
begin
set transaction isolation level serializable name 'Parent'; -- named 'Parent' txn
-- This main/parent transaction sees db as of this time for multi -statement consistency
-- Without "serialization" isolation level this main txn would see the committed changes of autonomous child txn below
insert into audit_test values('laks',sysdate,'Test',1) ;
commit_test; -- calls autonomous child txn
select max(log_id) into v_nr from audit_test ;
dbms_output.put_line('Maximum after autonomous txn In Parent : '|| v_nr); --Output should be 1 with "serializable" and 2 without it in parent txn.
rollback ; -- Doesnt affect committed changes of the autonomous child transaction.
end;
/
Nested Transaction eg (In PL/SQL_)
create table audit_test
(
name varchar2(20),
join_date date,
identifier varchar2(200),
log_id number
)
/
Truncate table audit_test
/
Create or replace procedure commit_test
is
v_nr number;
begin
-- set transaction name 'Child' ; You cannot start a true nested txn like this.
select nvl(max(log_id),0) into v_nr from audit_test ;
dbms_output.put_line('Maximum before child txn in Child:'||v_nr); --(1) Nested Child txn always sees uncommitted changes in Parent txn
insert into audit_test values('laksA',sysdate-1,'TestA',2);
commit; --Everything done in Child as well as in Parent prior to callign Child gets committed.
end;
/
declare
v_nr number ;
begin
set transaction isolation level serializable name 'Parent'; -- named 'Parent' txn
-- This main/parent transaction sees db as of this time for multi -statement consistency
-- Parent would always sees uncommitted/committed changes in nested child txn.
insert into audit_test values('laks',sysdate,'Test',1) ;
commit_test; -- calls nested child txn named 'Child'
select max(log_id) into v_nr from audit_test ;
dbms_output.put_line('Maximum after Child Txn in Parent '|| v_nr); --Output should be 2 in parent txn always.
rollback ; --No Use at all .
end;
/
Looks like there is no true nested transaction API support in Oracle.
All these transaction concepts esp isolation level for a transaction implemented by DBMS vendors are requirements from TPC(Transaction Processing performance council) which sets few standards and req, to publish benchmark results.
JTA/JTS (java transaction API/java transaction service) is also a driving force for Transaction API provided by vendors. Oracle implementation of transaction API is much different from other DB vendors and also for performance/integrity reasons Oracle doesnt provide some features.
Things to watchout are esp in the context of temp tables,
Autonomous transactions just happen in another transaction but within the same session of parent/main txn and so your temp tables/gtt s created in main txn should be accessible from within autonomous txn except for the uncommitted changes done to it in main txn immediately (Infact if you cannot even populate a same gtt/temp table which has been already populated in main txn, you would get error in autonomous txn )
I did some study and found that use of autonmous txn is 99% for auditing/logging purposes and as Thomas Kyte(asktom) says any other use of them is sure a problem in design/code.You would need to really check your logic for such a use case before you decide some txn as a autonomous txn.
I would summarise the following for autonomous and nested txns:
Autonomous Txn:
- Autonomous txn is just a different independent transaction from the main/parent txn but within the same session . Hence does not share transactional resources as that of main/parent txn.
- Cannot see uncommitted changes in main/parent txn for consistency reasons. (Note: Consistency is always at transactional level and not at session level)
- After a commit in autonomous txn you return immediately to the transactional context of main/parent transaction.i.e after a commit in autonomous txn you are back to parent txn.
- Autonomous txn since they operate within the same session they can access the gtt/temp tables but cannot see data in them already populated by main/parent txn. Infact they get error when they try to populate them if done already in parent txn. But they can populate them if not already populated in parent/main txn which would be a rare case.
- Changes made in autonomous txn are visible to parent/main txn based on isolation level set by main/parent transaction using the "set transaction isolation level .." statement in pl/sql. Oracle,by default makes committed changes visible(i,e "read committed" isolation level is default for any DML statement level) but "serializable" isolation level can be set for a transaction level using "set transaction isolation level serializable" statement for multi-statement read consistency. i.e the main/parent transaction would not see any committed changes made later by other transactions including autonomous txn which is also a different txn. Hence if your parent/main txn starts with a set transaction ..serializable it wont see any committed changes done in the autonomous child txn of it. Normally you would use this "serializable" isolation level for a short time OLTP txns and most often go with default "read committed" statement level.
- Exceptions raised from within autonomous txn get rolled back to transaction level and not to statement level.
- Use of Autonomous txn in XA/distributed env was not supported in 9i and not sure of complications in later releases.
- Autonomous txn use cases are very rare and 99.99% they are for logging/auditing purposes.
Nested Txn:
- For Oracle nested txn simple mean a transaction done from within a parent/main txn as i explained already.You can only set savepoints and rollback to them as you know already. You can use JDBC 3.0 standard savepoints interface for this in java or use pl/sql savepoints to rollback incrementally as you said.
- Transaction isolation levels can also be set using jdbc APIs. Oracle as said above only support default "read committed" and "serialization" levels.
- In Oracle Nested txns always see uncommitted changes in parent/main txn and changes in nested child txns are also always visible for parent txn.
Please see autonomous and nested transaction example.
Autonomous txn Example (In PL/SQL)
create table audit_test
(
name varchar2(20),
join_date date,
identifier varchar2(200),
log_id number
)
/
Truncate table audit_test
/
Create or replace procedure commit_test
is
pragma autonomous_transaction ;
v_nr number;
begin
select nvl(max(log_id),0) into v_nr from audit_test;
dbms_output.put_line('Maximum before autonomous txn In Child:'||v_nr); --(0)Autonomous Child txn wont see uncommitted changes in Parent.
insert into audit_test values('laksA',sysdate-1,'TestA',2);
commit; --Autonomous Child txn has to a commit/rollback always
end;
/
declare
v_nr number ;
begin
set transaction isolation level serializable name 'Parent'; -- named 'Parent' txn
-- This main/parent transaction sees db as of this time for multi -statement consistency
-- Without "serialization" isolation level this main txn would see the committed changes of autonomous child txn below
insert into audit_test values('laks',sysdate,'Test',1) ;
commit_test; -- calls autonomous child txn
select max(log_id) into v_nr from audit_test ;
dbms_output.put_line('Maximum after autonomous txn In Parent : '|| v_nr); --Output should be 1 with "serializable" and 2 without it in parent txn.
rollback ; -- Doesnt affect committed changes of the autonomous child transaction.
end;
/
Nested Transaction eg (In PL/SQL_)
create table audit_test
(
name varchar2(20),
join_date date,
identifier varchar2(200),
log_id number
)
/
Truncate table audit_test
/
Create or replace procedure commit_test
is
v_nr number;
begin
-- set transaction name 'Child' ; You cannot start a true nested txn like this.
select nvl(max(log_id),0) into v_nr from audit_test ;
dbms_output.put_line('Maximum before child txn in Child:'||v_nr); --(1) Nested Child txn always sees uncommitted changes in Parent txn
insert into audit_test values('laksA',sysdate-1,'TestA',2);
commit; --Everything done in Child as well as in Parent prior to callign Child gets committed.
end;
/
declare
v_nr number ;
begin
set transaction isolation level serializable name 'Parent'; -- named 'Parent' txn
-- This main/parent transaction sees db as of this time for multi -statement consistency
-- Parent would always sees uncommitted/committed changes in nested child txn.
insert into audit_test values('laks',sysdate,'Test',1) ;
commit_test; -- calls nested child txn named 'Child'
select max(log_id) into v_nr from audit_test ;
dbms_output.put_line('Maximum after Child Txn in Parent '|| v_nr); --Output should be 2 in parent txn always.
rollback ; --No Use at all .
end;
/
Looks like there is no true nested transaction API support in Oracle.
All these transaction concepts esp isolation level for a transaction implemented by DBMS vendors are requirements from TPC(Transaction Processing performance council) which sets few standards and req, to publish benchmark results.
JTA/JTS (java transaction API/java transaction service) is also a driving force for Transaction API provided by vendors. Oracle implementation of transaction API is much different from other DB vendors and also for performance/integrity reasons Oracle doesnt provide some features.
Monday, July 16, 2007
Cheat Attacks And Kernel Patches
It seems i blog once in a new moon these days.
I was going through an article http://www.cs.huji.ac.il/~dants/papers/Cheat07Security.pdf
Thought very nice and let me share it with readers of my blog.
Another interesting article i read on a Linux site is on a kernel patch introducing 2 new metrics PSS(Proportional Set Size) and USS(Unique Set Size) to find out more exactly how a process is using memory in a Linux computer system.
While existing VSS (Virtual memory size) and RSS(Resident size) of a process give you a picture of how much memory a process uses they never give you the exact picture of how much really your process contributes in memory use.
Here is the link , read on..
http://www.linuxworld.com/news/2007/042407-kernel.html
And one of my friends joked about writing only technical articles in my blog which makes it rather boring for him , i 've decided to add interesting incidents in my professional life as well
here.
I was going through an article http://www.cs.huji.ac.il/~dants/papers/Cheat07Security.pdf
Thought very nice and let me share it with readers of my blog.
Another interesting article i read on a Linux site is on a kernel patch introducing 2 new metrics PSS(Proportional Set Size) and USS(Unique Set Size) to find out more exactly how a process is using memory in a Linux computer system.
While existing VSS (Virtual memory size) and RSS(Resident size) of a process give you a picture of how much memory a process uses they never give you the exact picture of how much really your process contributes in memory use.
Here is the link , read on..
http://www.linuxworld.com/news/2007/042407-kernel.html
And one of my friends joked about writing only technical articles in my blog which makes it rather boring for him , i 've decided to add interesting incidents in my professional life as well
here.
Saturday, January 20, 2007
Emerging Trends
Aah. i am back to Google's blogger and I am posting this after nearly a 10 month gap. Finally managed to overcome all the forces which kept me away from blogging.
Let me go straightaway to things which i see are emerging in a bigger way with Oracle:
1) Oracle's Fusion Middleware-gaining grounds with lots of new standards like Java 5,Web2.0 and Java Persistance (JPA ) standards
2) Oracle Enterprise Manager Grid Control -(EMGC)- One stop place to manage all your Oracle products and related infrastructure , data center ,grid automation and also a whole lot of plugins to manage and monitor other vendor products in an enterprise.
3) Grid Computing in Oracle's vision has seen many changes in recent years with the emergence of whole lot of new features with Oracle 10g database and plenty of others to come with Oracle 11g database.
(One i am curiously waiting for is the Query Caching or Result Set Caching with Oracle 11g database from application development perspective and the other much waited featue is RAC Rolling upgrade with 11g from Database administration )
Let me go straightaway to things which i see are emerging in a bigger way with Oracle:
1) Oracle's Fusion Middleware-gaining grounds with lots of new standards like Java 5,Web2.0 and Java Persistance (JPA ) standards
2) Oracle Enterprise Manager Grid Control -(EMGC)- One stop place to manage all your Oracle products and related infrastructure , data center ,grid automation and also a whole lot of plugins to manage and monitor other vendor products in an enterprise.
3) Grid Computing in Oracle's vision has seen many changes in recent years with the emergence of whole lot of new features with Oracle 10g database and plenty of others to come with Oracle 11g database.
(One i am curiously waiting for is the Query Caching or Result Set Caching with Oracle 11g database from application development perspective and the other much waited featue is RAC Rolling upgrade with 11g from Database administration )
Monday, February 27, 2006
Spfile or Pfile dilemma
Here is something which would be useful in determining what was used to start an oracle instance:
We have 5 possible answers(Clearly Spfile is the way to go in future..just in case you are still having 8i and 9i instances and switching over to spfiles):
1. On Startup the DB first looks for spfileYourSID.ora in the default location (eg On windows it would most probably be $ORACLE_HOME/database or $ORACLE_HOME/dbs on unix) and then looks for spfile.ora in the same default location.Spfile in the default location is used with the default name and no pfile was used.
This would be the case for all default 9i DBs created from 9i onwards.
2. A pfile in the default location with the default name(init.ora) was used and a nondefault spfile was used using IFILE parameter in pile pointing to the non defailt location of spfile.
Here on instance startup the db looks for default spfile and if not there goes for default pfile which in turn points to the spfile in nondefault location.
3. A nondefault pfile was used and a nondefault spfile was used.
Here you specified a non default pfile on instance startup for some reasons known to you.
4. A pfile in the default location with the default name was used and no spfile was used.
i.e It's high time you read about spfile and switch to spfile here.
5. A nondefault pfile was used and no spfile was used.
Same as above in case 4.
We have 5 possible answers(Clearly Spfile is the way to go in future..just in case you are still having 8i and 9i instances and switching over to spfiles):
1. On Startup the DB first looks for spfileYourSID.ora in the default location (eg On windows it would most probably be $ORACLE_HOME/database or $ORACLE_HOME/dbs on unix) and then looks for spfile.ora in the same default location.Spfile in the default location is used with the default name and no pfile was used.
This would be the case for all default 9i DBs created from 9i onwards.
2. A pfile in the default location with the default name(init
Here on instance startup the db looks for default spfile and if not there goes for default pfile which in turn points to the spfile in nondefault location.
3. A nondefault pfile was used and a nondefault spfile was used.
Here you specified a non default pfile on instance startup for some reasons known to you.
4. A pfile in the default location with the default name was used and no spfile was used.
i.e It's high time you read about spfile and switch to spfile here.
5. A nondefault pfile was used and no spfile was used.
Same as above in case 4.
Friday, January 27, 2006
Blogging and drawing inspiration --Mistaken
In my previous article,i had posted some tips for some quick real time tuning using OEM (9i) without the actual screen shots(for those who view it in other than IE) and for those who want to see the document with pictures here is the download link.
http://rapidshare.de/files/11994839/
Guide_to_Real_Time_Performance_Tuning_
Of_Oracle.doc.html
It would be a good starting point for those who want to see how OEM can be used for tuning ..Pls read the Oracle documentation carefully if you need more understanding of the underlying concepts and issues.
Again , i reiterate....
--------------------------------
It's a natural thing that everyone wants a blog to write whatever they feel and want to share some good things they are interested with others.
When i post good articles from people who have a great experience and well known in Oracle arena here, i do it with the genuine and sincere attempt to just share it with my friends and not to gain any other thing.
If copying the blog template and posting articles by others in my blog hurt/affect the original authors they can mail me so that i would stop doing so.
I accept my mistake that i had misspelled the author's name in one occassion and express my sincere apologies to the author.
Well, i hope people would see that i am genuine here and have nothing here to take credit/gain popularity/"whatever" one can possibly think of.
-------------------------
http://rapidshare.de/files/11994839/
Guide_to_Real_Time_Performance_Tuning_
Of_Oracle.doc.html
It would be a good starting point for those who want to see how OEM can be used for tuning ..Pls read the Oracle documentation carefully if you need more understanding of the underlying concepts and issues.
Again , i reiterate....
--------------------------------
It's a natural thing that everyone wants a blog to write whatever they feel and want to share some good things they are interested with others.
When i post good articles from people who have a great experience and well known in Oracle arena here, i do it with the genuine and sincere attempt to just share it with my friends and not to gain any other thing.
If copying the blog template and posting articles by others in my blog hurt/affect the original authors they can mail me so that i would stop doing so.
I accept my mistake that i had misspelled the author's name in one occassion and express my sincere apologies to the author.
Well, i hope people would see that i am genuine here and have nothing here to take credit/gain popularity/"whatever" one can possibly think of.
-------------------------
Real Time Tuning using OEM--Some Tips
This is an article which i had prepared for one of my clients in using OEM for some quick tuning and as a starting point for configuring , using OEM & its tuning packs.
Unfortunately i couldn't post the pictures here ..would be posting it shortly.
CONTENTS
INTRODUCTION
OEM Tuning Pack
OMS and OEM Repository
Configuring the OEM console for using the Oracle Management Server (OMS) option
STEP 1:
STEP 2:
STEP 3:
STEP 4:
STEP 5:
Index Tuning Wizard
Oracle Expert
SQL Analyze
Unfortunately i couldn't post the pictures here ..would be posting it shortly.
Guide to Real Time Performance Tuning Of Oracle
Version 1.0
CONTENTS
Guide to Real Time Performance Tuning Of Oracle
Configuring the OEM console for using the Oracle Management Server (OMS) option
INTRODUCTION
Oracle Enterprise Edition provides a lot of features for Real Time Tuning of an Oracle Database which can be used efficiently to serve as an aid in the tuning process and can help the DBA in identifying the performance bottlenecks in any Oracle system which undergoes constant changes as a result of business changes and also in improving the response time of the application to the satisfaction of the end users.
Oracle Enterprise Edition provides a lot of GUIs in its Tuning Packs that can be launched from OEM console with the Oracle Management Server (OMS) login option.
OEM Tuning Pack
OEM Tuning Packs include the Index Tuning Wizard, Oracle Expert and SQL Analyze as some of the important tools which can help the DBA in accelerate the tuning and also more importantly identify the workload pattern to get the accurate tuning recommendations for the Oracle Database under tuning. These tuning packs require the OEM console to be configured for using with an OEM repository under the OMS option.
OMS and OEM Repository
The Oracle Management Server (OMS) uses an OEM Repository to store all the tuning session details and many other DB related task details in it. OMS uses this repository to store all the tuning statistics and Job details(if jobs are configured) apart from many other things in the OEM repository for all the target databases to which one connects from the OEM console using the OMS option.
Configuring the OEM console for using the Oracle Management Server (OMS) option
OEM console needs to be configured properly for using the Oracle Management Server option. This can be done using the Enterprise Manager Configuration Assistant(EMCA) that can be launched in Oracle for Windows NT platform from the Configuration and Migration Tools menu.
The following steps would illustrate the use of EMCA to configure OEM console for using the OMS option:
STEP 1:
STEP 2:
If you are configuring the OMS to used an OEM repository for the first time, then select the first option. Selecting this option enables one to configure the local OMS on the server. This configuration would create an additional Windows NT service with the naming convention Oracle
STEP 3:
This step would help in creating a repository for the OMS in the server. This OEM repository for the local OMS is just another Oracle Schema which can be configures either in one of the existing databases or in a new database exclusively for the OEM repository.
If you are creating a repository for the first time use the first option here.
STEP 4:
Depending on whether you need to create a new database exclusively for hosting your OEM repository or use one of your existing databases for storing the OEM repository choose either the “Typical” or “Custom” options here.
STEP 5:
If you have chosen the “Typical” option here then you would end up in the following screen which would help you in creating a new database with the default naming conventions, a new Schema (a Repository user along with the configuration data in tables and associated objects under the user).
This new database would be like any other database except for the fact that it would be hosting the OEM repository and everytime one would be connecting to this database whenever you are launching OEM console using the OMS option.
In case you want a “Custom” configuration of OEM repository then you would be presented with the following screen from where you can choose to create a new database( as above) or use an existing database for hosting the OEM repository as below:
One would be prompted to give the OEM repository name and password details later. In case you are choosing an existing database option then you would be prompted to furnish the details of an user having DBA rights in the existing database so that using this DBA login credentials the OEM repository schema can be created in the existing database.
The screens which follow from hereon are self explanatory and any user having a basic understanding of the Oracle DB should be able to finish the configuration process.
In case you run into any problems in configuring the OMS you can always restart the whole process at any time and even if you have ended up with a wrong configuration , one can always drop the repository and recreate a new one.
Index Tuning Wizard
This wizard helps us in arriving at a proper and effective indexing strategy. This Index tuning wizard can go a long way in helping the DBA arrive at a right combination of the indexes for the application and helps in improving the response time of the SQLs which consume more system resources by identifying new possible indexes.
This wizard also gives justifications for the recommended indexes and also generates the script to implement the recommended indexing changes. These recommended changes and the script can then be reviewed by the DBA to arrive at a final Indexing recommendations. Thus the tool helps the DBA in Indexing strategy and thereby accelerating the tuning process
Oracle Expert
This is a very powerful tool which can automate the process of collecting statistics at database, instance, schema and workload levels and help in arriving at recommendations at a more generic level. With real time workload and actual CPU, Memory details of the live system, Oracle Expert recommendations would be extremely effective in performance tuning to the DBA. The manual way of collecting Statspack reports and then using them to arrive at tuning recommendations can be partially automated using this Oracle Expert and also help the DBA in speeding up the tuning process by arriving at recommendations not only at the SQL level but also at the Instance level.
SQL Analyze
SQL Analyze is a powerful SQL tuning tool which comes along with many other wizards like Virtual Indexing wizard, Hint Wizard etc.
SQL Analyze helps the DBA in automating the tuning of resource intensive SQLs by identifying the SQLs under different categories similar to the SQL reports sections in Statspack reports and helps the DBA in tuning them with many supporting utilities like Virtual Indexing wizard.
Virtual Indexing Wizard in particular is one of the most useful and effective tool which helps in identifying the performance improvement without actually creating those recommended indexes.
Conclusion
Oracle tuning of existing systems/already running systems needs to be done with extra care so as to minimize those changes which need more development/maintenance effort and also possibly those inevitable testing efforts. At the same time tuning should also meet the end users objectives in the shortest possible time. Oracle’s tuning tools described here come very handy for the DBA to meet the above requirements.
Blogging and drawing inspiration --Mistaken
It's a natural thing that everyone wants a blog to write whatever they feel and want to share some good things they are interested with others.
When i post good articles from people who have a great experience and well known in Oracle arena here, i do it with the genuine and sincere attempt to just share it with my friends and not to gain any other thing.
If copying the blog template and posting articles by others in my blog hurt/affect the original authors they can mail me so that i would stop doing so.
I accept my mistake that i had misspelled the author's name in one occassion and express my sincere apologies to the author.
Well, i hope people would see that i am genuine here and have nothing here to take credit/gain popularity/"whatever" one can possibly think of.
When i post good articles from people who have a great experience and well known in Oracle arena here, i do it with the genuine and sincere attempt to just share it with my friends and not to gain any other thing.
If copying the blog template and posting articles by others in my blog hurt/affect the original authors they can mail me so that i would stop doing so.
I accept my mistake that i had misspelled the author's name in one occassion and express my sincere apologies to the author.
Well, i hope people would see that i am genuine here and have nothing here to take credit/gain popularity/"whatever" one can possibly think of.
Friday, January 06, 2006
Good Oracle Books
Thomas Kyte's Good Oracle (Must Read) for DBAs and Developers
---------------------------------------------------------------------------------
1. Expert Oracle Database Architecture: 9i and 10g Programming Techniques and Solutions
2. Expert one-on-one: Oracle
3. Effective Oracle By Design
---------------------------------------------------------------------------------
1. Expert Oracle Database Architecture: 9i and 10g Programming Techniques and Solutions
2. Expert one-on-one: Oracle
3. Effective Oracle By Design
(you can go for 1 as it contains 10G and also 3 if possible )
For SQL*PLUS and PL/SQL the following are good books
------------------------------------------------------------------------
1 Mastering Oracle SQL and SQL*PLUS -- By Lex De Haan
2 Mastering PL/SQL -- By Connor McDonald
For General Oracle Concepts from Scalability and Performance of Oracle Applications perspective
----------------------------------------------------------------------------------------------------------------------
1. Scaling Oracle 8i (Eventhough the name says 8i it is a very good book whose concepts still apply)
-- By James Morle(Expert on Scalability,RAID and SAN/NAS concepts)
(Good thing is this book can be downloaded from www.scalabilities.co.uk site -- http://www.scaleabilities.co.uk/book/scalingOracle8i.pdf)
Other Good Books are :
1.Practical Oracle 8i -- Jonathan Lewis (Again the name'8i' is a misnomer as it is a good book that holds true still)
2. Cost Based Oracle Fundamentals -- Jonathan Lewis (A very good book of recent times )
If you want to understand how Oracle’s Cost Based Optimizer works, you will want to read this book. To get you started, there is a pdf of Chapter 5 (Clustering Factor) that you can download from Apress
2. Cost Based Oracle Fundamentals -- Jonathan Lewis (A very good book of recent times )
If you want to understand how Oracle’s Cost Based Optimizer works, you will want to read this book. To get you started, there is a pdf of Chapter 5 (Clustering Factor) that you can download from Apress
Yahoo! Photos
Got holiday prints? See all the ways to get quality prints in your hands ASAP.
Tuesday, January 03, 2006
Project Raptor is available now
Oracle has released a new tool called Raptor. This tool is a java-based GUI for accessing Oracle databases. It allows to perform SQL and PL/SQL and to browse database objects.
It includes a lot of useful features, e.g:
- Multiple database connections
- Database reports (pre-defined and user-defined)
- SQL Formatting
- PLSQL debug
- PLSQL OWA output
- ...
http://www.oracle.com/technology/software
/htdocs/eaplic.html?
http://download.oracle.com/otn/other/
raptor-0715.zip
Moreover it is free to use.
At this moment, an early adopters release is available, the production release is scheduled for early 2006.
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Wednesday, December 28, 2005
New Ways to see the World
I stumbled upon this interesting series of World maps at this site while reading some blogs.
The population map which shows each country extended according to their Population size is very interesting.
(Surprised to see the size of India , Canada and Australia!!).
http://www.odt.org/Index.htm
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Tuesday, December 27, 2005
Middleware matters!!
Couple of weeks before i was desperate to jump into the Oracle Java enterprise programming.
The result of which i was fiddling with my 1 GB RAM DELL laptop to have a complete Oracle 10G infrastructure and App server running.
For folks who have such bizarre desires here is an interesting article on Oracle 10G App server topography by Mr. John Garmany.
http://www.dba-oracle.com/art_dbazine_oracle_server_topography.htm
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Thursday, December 22, 2005
Oracle's HTML DB technology making its inroads
Oracle is pushing its HTML DB technology for faster and easier way of building data driven web sites strongly and it has
built its Metalink site (The ulitmate Oracle knowledge and support website) newly using HTML DB.
The famous Oracle Asktom website is also running using HTML DB technology.
It would be interesting to wait and see how Oracle would market its use and applications.
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Thursday, December 15, 2005
Optimization Can be Funny at Times!!
Sometimes people spend hours of effort on optimizing things which they might be running(if at all) only once and the actual process itself may take possibly less time than the effort spent. Funny ..Is'nt it?
That's why Cost Benefit Analysis and predicting your benefits is an important measure for Oracle Performance Consulting projects.
This is well brought out by Cary Milsap and Jeff holt's book on "Optimizing Oracle Performance".
Earlier i had promised an article on Hotsos Profiler and why it is given great importance in scientific approaches to Oracle Performance Consulting projects.
Unfortunately i had been working on many other things including working on my own 10046 Resource Profiler in Perl similar to Hotsos.
I would definitely highlight the salient features and concepts behind the Hotsos and Sparky Data collection tool at Hotsos by Cary Milsap et al.
Anyone interested in knowing about how Oracle RDBMS kernel mesaures itself in terms of CPU usage timing and Wait Event Statistics should read the above book by Cary Milsap along with Richmond Shee's book on Oracle Wait Event Tuning.
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Friday, December 09, 2005
The Art of Writing Good SQL -- By David Aldridge
This is a good article by Mr. David Aldridge and the original source is here. http://oraclesponge.blogspot.com).
My sincere apologies for not getting the author's name right and i was so careless and lazy that i pasted the entire article here without the orginal source link.
The article was really a comprehensive one and pls do read it at the above link.
Anways here is what the aricle outlines.
-- Excerpts from the above orginal source...
"
Writing Good SQL
My sincere apologies for not getting the author's name right and i was so careless and lazy that i pasted the entire article here without the orginal source link.
The article was really a comprehensive one and pls do read it at the above link.
Anways here is what the aricle outlines.
-- Excerpts from the above orginal source...
"
Writing Good SQL
I think that there are at least five elements to consider. In no particular order:
- Understanding what you are trying to do
- Knowledge of SQL syntax
- Appreciation of the data and the structure
- Optimization
- Measurement of performance
| " |
Tuesday, December 06, 2005
Oracle Federated Search
Here is a new Search link which gives a Federated Search for most of Oracle products and releases which include the following :
- Oracle Database 8i, 9i Release 2, 10g Release 1, 10g Release 2, Express Edition
- Oracle Application Server 9i Release 2, 10g Release 1, 10g Release 2
- Oracle Collaboration Suite 9i Release 2, 10g Release 1
http://otn.oracle.com/pls/db102/db102.federated_search
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Monday, November 14, 2005
Evolution of Oracle App.Server
Pls see this link for interesting information on Oracle App.Server and how it is evolving along with the DB server.
http://www.rittman.net/archives/000745.html
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Friday, November 04, 2005
Monday, September 19, 2005
Free Download : Oracle Jdeveloper with ADF
EASY WEB APPLICATION DEVELOPMENT USING ADF IN JDEVELOPER 10G
You can download free JDeveloper with ADF(For Windows) from,
http://download.oracle.com/otn/java/jdeveloper/10121/jdev1012.zip
(Around 200MB only )
Note : With ADF(Application Development Framework) in Oracle JDeveloper 10G you can rapidly develop J2EE applications using the
MVC (Model 2 with Struts controller) scalable architecture. ADF Data model and binding helps the J2EE developer with faster development
using the in built ADF runtime components. Just focus on Business services model , draw the business model dragging the enitity beans components.
You can develop a full HTML/web application in just 8 easy wizard driven steps. In addition if you have addtional knowledge on J2EE design you can deploy the components as web services or ADF UIX clients or whatever J2EE component you wish at each level.
For more info on this,
You can Download good presentations from experts at TUSC
http://team.tusc.com/pls/inet/inet_Download_Info_pkg.Get_Info?in_item=doc2004-jdeveloper_web_dev.zip
and http://team.tusc.com/pls/inet/inet_Download_Info_pkg.Get_Info?in_item=laoug2003-quick_web.zip
You can download free JDeveloper with ADF(For Windows) from,
http://download.oracle.com/otn/java/jdeveloper/10121/jdev1012.zip
(Around 200MB only )
Note : With ADF(Application Development Framework) in Oracle JDeveloper 10G you can rapidly develop J2EE applications using the
MVC (Model 2 with Struts controller) scalable architecture. ADF Data model and binding helps the J2EE developer with faster development
using the in built ADF runtime components. Just focus on Business services model , draw the business model dragging the enitity beans components.
You can develop a full HTML/web application in just 8 easy wizard driven steps. In addition if you have addtional knowledge on J2EE design you can deploy the components as web services or ADF UIX clients or whatever J2EE component you wish at each level.
For more info on this,
You can Download good presentations from experts at TUSC
http://team.tusc.com/pls/inet/inet_Download_Info_pkg.Get_Info?in_item=doc2004-jdeveloper_web_dev.zip
and http://team.tusc.com/pls/inet/inet_Download_Info_pkg.Get_Info?in_item=laoug2003-quick_web.zip
Sunday, September 18, 2005
Oracle Performance Tuning-Never Dare to enter this sea without sufficient experience
As Steve(DatabaseJournal) points out Oracle Performance Tuning can be like drowning into a pool ..It can be a big confusion of sorts for those who involve in it for the first time without prior experience and sufficient knowledge/skills in this area.
A typical newbie would try to keep his/her hands on everything which may suggest need tuning without a fixed direction.
Tuning Oracle is a profession where your knowlege of how Oracle works would be under real test and expereince counts a lot.
You need to hit the right balance on looking at hit ratios(checklist based tuning) as well as focussing with extended sql trace (Wait interface tuning) and most imortantly on how your business management see this. The more they give importance to the tuning exercise the more would be your efforts..
If just making things work at some acceptable level is what you need, don't waste extra time on it..(personal lessons learnt)
Would come up with an interesting article on Extended SQL tracing(10046 event) and hotsos resource profiler(Why Cary Milsap charges you heavily for this..)
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