I'm looking for documentation pointers to learn what I need to put together
a distributed database system. I've read through "Oracle 9i Database
Administrator's Guide: Distributed Database Concepts" and Oracle Database
Concepts: Introduction to the Oracle Server: Distributed Databases
Overview", but I don't see how to do what I want.
I would like to set up a distributed database system with location
transparency and a shared schema (i.e. horizontal fragmentation). I'll
provide a little more context: I have three databases, running on separate
systems, all of which use the identical schema. So, each has entries in a
table "foo", which are unique. I'd like to provide a global access to this
data, so a client can effectively query the set of databases. So, asking
for all entries in the "foo" table would retrieve the contents of db1.foo,
db2.foo, and db3.foo. Ideally, when all is said and done, I'm planning to
wrap this in an enterprise java bean to provide an object interface.
Database links looked like the closest idea I could find, but they don't
deal well with the idea that my "foo" table has entries spread across the db
instances.
A pointer in the right direction would be greatly appreciated.
Jason ja***@fc.hp.com 7  3963 
"J Goldman" <ja***@fc.hp.com> wrote in message
news:3f********@usenet01.boi.hp.com... I'm looking for documentation pointers to learn what I need to put
together a distributed database system. I've read through "Oracle 9i Database
Administrator's Guide: Distributed Database Concepts" and Oracle Database
Concepts: Introduction to the Oracle Server: Distributed Databases
Overview", but I don't see how to do what I want.
I would like to set up a distributed database system with location
transparency and a shared schema (i.e. horizontal fragmentation). I'll
provide a little more context: I have three databases, running on
separate systems, all of which use the identical schema. So, each has entries in a
table "foo", which are unique. I'd like to provide a global access to
this data, so a client can effectively query the set of databases. So, asking
for all entries in the "foo" table would retrieve the contents of db1.foo,
db2.foo, and db3.foo. Ideally, when all is said and done, I'm planning to
wrap this in an enterprise java bean to provide an object interface.
Database links looked like the closest idea I could find, but they don't
deal well with the idea that my "foo" table has entries spread across the
db instances.
A pointer in the right direction would be greatly appreciated.
Jason
ja***@fc.hp.com
Why do you want them spread over 3 machines? On one machine you might want
to partition the data into 3 tables and access the partition. You could use
database links and views, but it is going to be very inefficient.(the link
might have to retrieve the whole table and resolve the query on the database
you are attached to - ouch, dragging all that data over a link.) Whereas a
RAC might be better.
Jim
"J Goldman" <ja***@fc.hp.com> wrote in message news:<3f********@usenet01.boi.hp.com>... A pointer in the right direction would be greatly appreciated.
Jason
ja***@fc.hp.com
I would like to set up a distributed database system with location
transparency and a shared schema (i.e. horizontal fragmentation). I'll
provide a little more context: I have three databases, running on separate
systems, all of which use the identical schema. So, each has entries in a
table "foo", which are unique. I'd like to provide a global access to this
data, so a client can effectively query the set of databases. So, asking
for all entries in the "foo" table would retrieve the contents of db1.foo,
db2.foo, and db3.foo. Ideally, when all is said and done, I'm planning to
wrap this in an enterprise java bean to provide an object interface.
Your scenario has 'DISASTER AHEAD' inscribed all over it. You would be
better off by using a few 1000 of voting machines using punchcards.
Your approach would require to use UNIONs for everything, which means
the database will resort to full table scan and sorting for ALL sql
you sunmit.
Need I say more? Why do you want this? Are you up for a career move,
or do you like getting sacked by HP?
Sybrand Bakker
Senior Oracle DBA
"Jim Kennedy" <kennedy-down_with_spammers@no_spam.comcast.net> wrote in
message news:eb*******************@rwcrnsc52.ops.asp.att.n et... "J Goldman" <ja***@fc.hp.com> wrote in message
news:3f********@usenet01.boi.hp.com... I'm looking for documentation pointers to learn what I need to put together a distributed database system. I've read through "Oracle 9i Database
Administrator's Guide: Distributed Database Concepts" and Oracle
Database Concepts: Introduction to the Oracle Server: Distributed Databases
Overview", but I don't see how to do what I want.
I would like to set up a distributed database system with location
transparency and a shared schema (i.e. horizontal fragmentation). I'll
provide a little more context: I have three databases, running on
separate systems, all of which use the identical schema. So, each has entries in
a table "foo", which are unique. I'd like to provide a global access to
this data, so a client can effectively query the set of databases. So,
asking for all entries in the "foo" table would retrieve the contents of
db1.foo, db2.foo, and db3.foo. Ideally, when all is said and done, I'm planning
to wrap this in an enterprise java bean to provide an object interface.
Database links looked like the closest idea I could find, but they don't
deal well with the idea that my "foo" table has entries spread across
the db instances.
A pointer in the right direction would be greatly appreciated.
Jason
ja***@fc.hp.com
Why do you want them spread over 3 machines? On one machine you might
want to partition the data into 3 tables and access the partition. You could
use database links and views, but it is going to be very inefficient.(the link
might have to retrieve the whole table and resolve the query on the
database you are attached to - ouch, dragging all that data over a link.) Whereas
a RAC might be better.
Jim
Well, the first reason why they're spread over three machines is that I'm
adding
this to an existing product, where the databases have already been set up
like this.
This is designed such that each machine controls its own domain and one
machine
cannot access another's data. Aside from security, locality of data is also
relevant.
I'm just adding a global management view to collect all that data.
I'll have to read up on RAC to see if that addresses my needs. Thanks.
Regards,
Jason ja***@fc.hp.com
Well, thanks for the vote of confidence. I appreciate your point that
this approach doesn't seem doomed to success. With that in mind,
can you offer any contructive suggestion on how I might provide
global access to this data? My other main thought has been to create
a set of entity EJBs local to each machine, along with a set of global
session beans. The global session beans would use something like a
dbhost parameter (where appropriate) to guide which db should be
read. Generic requests would query all of the DBs.
Jason ja***@fc.hp.com
"Sybrand Bakker" <po*****@sybrandb.demon.nl> wrote in message
news:a2**************************@posting.google.c om... "J Goldman" <ja***@fc.hp.com> wrote in message
news:<3f********@usenet01.boi.hp.com>... A pointer in the right direction would be greatly appreciated.
Jason
ja***@fc.hp.com
I would like to set up a distributed database system with location
transparency and a shared schema (i.e. horizontal fragmentation). I'll
provide a little more context: I have three databases, running on
separate systems, all of which use the identical schema. So, each has entries in
a table "foo", which are unique. I'd like to provide a global access to
this data, so a client can effectively query the set of databases. So,
asking for all entries in the "foo" table would retrieve the contents of
db1.foo, db2.foo, and db3.foo. Ideally, when all is said and done, I'm planning
to wrap this in an enterprise java bean to provide an object interface.
Your scenario has 'DISASTER AHEAD' inscribed all over it. You would be
better off by using a few 1000 of voting machines using punchcards.
Your approach would require to use UNIONs for everything, which means
the database will resort to full table scan and sorting for ALL sql
you sunmit.
Need I say more? Why do you want this? Are you up for a career move,
or do you like getting sacked by HP?
Sybrand Bakker
Senior Oracle DBA
"Jim Kennedy" <kennedy-down_with_spammers@no_spam.comcast.net> wrote in
message news:eb*******************@rwcrnsc52.ops.asp.att.n et... Why do you want them spread over 3 machines? On one machine you might
want to partition the data into 3 tables and access the partition. You could
use database links and views, but it is going to be very inefficient.(the link
might have to retrieve the whole table and resolve the query on the
database you are attached to - ouch, dragging all that data over a link.) Whereas
a RAC might be better.
Jim
Well, I did a little bit of reading and I'm not convinced that a cluster
approach will
really address my problem. I'm leaning towards more of an EJB approach that
I
mentioned in another response. Thanks for the suggestions though.
Regards,
Jason ja***@fc.hp.com
No, move all the data to 1 machine and have 3 schemas. Then you can create
a view that joins the 3 schemas(1 view for each table). The entity bean
approach is a Java programmer with a hammer that thinks everything is a
nail.]
Jim
--
Replace part of the email address: ke************************@attbi.com
with family. Remove the negative part, keep the minus sign. You can figure
it out.
"J Goldman" <ja***@fc.hp.com> wrote in message
news:3f********@usenet01.boi.hp.com... Well, thanks for the vote of confidence. I appreciate your point that
this approach doesn't seem doomed to success. With that in mind,
can you offer any contructive suggestion on how I might provide
global access to this data? My other main thought has been to create
a set of entity EJBs local to each machine, along with a set of global
session beans. The global session beans would use something like a
dbhost parameter (where appropriate) to guide which db should be
read. Generic requests would query all of the DBs.
Jason
ja***@fc.hp.com
"Sybrand Bakker" <po*****@sybrandb.demon.nl> wrote in message
news:a2**************************@posting.google.c om... "J Goldman" <ja***@fc.hp.com> wrote in message news:<3f********@usenet01.boi.hp.com>... A pointer in the right direction would be greatly appreciated.
Jason
ja***@fc.hp.com
I would like to set up a distributed database system with location
transparency and a shared schema (i.e. horizontal fragmentation).
I'll provide a little more context: I have three databases, running on separate systems, all of which use the identical schema. So, each has entries
in a table "foo", which are unique. I'd like to provide a global access to this data, so a client can effectively query the set of databases. So, asking for all entries in the "foo" table would retrieve the contents of db1.foo, db2.foo, and db3.foo. Ideally, when all is said and done, I'm
planning to wrap this in an enterprise java bean to provide an object interface.
Your scenario has 'DISASTER AHEAD' inscribed all over it. You would be
better off by using a few 1000 of voting machines using punchcards.
Your approach would require to use UNIONs for everything, which means
the database will resort to full table scan and sorting for ALL sql
you sunmit.
Need I say more? Why do you want this? Are you up for a career move,
or do you like getting sacked by HP?
Sybrand Bakker
Senior Oracle DBA
"Jim Kennedy" <kennedy-down_with_spammers@no_spam.comcast.net> wrote in message news:<mVsab.507793$Ho3.85596@sccrnsc03>... No, move all the data to 1 machine and have 3 schemas. Then you can create
a view that joins the 3 schemas(1 view for each table). The entity bean
approach is a Java programmer with a hammer that thinks everything is a
nail.]
Jim
--
Replace part of the email address: ke************************@attbi.com
with family. Remove the negative part, keep the minus sign. You can figure
it out.
"J Goldman" <ja***@fc.hp.com> wrote in message
news:3f********@usenet01.boi.hp.com... Well, thanks for the vote of confidence. I appreciate your point that
this approach doesn't seem doomed to success. With that in mind,
can you offer any contructive suggestion on how I might provide
global access to this data? My other main thought has been to create
a set of entity EJBs local to each machine, along with a set of global
session beans. The global session beans would use something like a
dbhost parameter (where appropriate) to guide which db should be
read. Generic requests would query all of the DBs.
Jason
ja***@fc.hp.com
"Sybrand Bakker" <po*****@sybrandb.demon.nl> wrote in message
news:a2**************************@posting.google.c om... "J Goldman" <ja***@fc.hp.com> wrote in message news:<3f********@usenet01.boi.hp.com>... > A pointer in the right direction would be greatly appreciated.
>
> Jason
> ja***@fc.hp.com I would like to set up a distributed database system with location
> transparency and a shared schema (i.e. horizontal fragmentation). I'll > provide a little more context: I have three databases, running on separate > systems, all of which use the identical schema. So, each has entries in
a > table "foo", which are unique. I'd like to provide a global access to this > data, so a client can effectively query the set of databases. So, asking > for all entries in the "foo" table would retrieve the contents of db1.foo, > db2.foo, and db3.foo. Ideally, when all is said and done, I'm planning
to > wrap this in an enterprise java bean to provide an object interface.
>
Your scenario has 'DISASTER AHEAD' inscribed all over it. You would be
better off by using a few 1000 of voting machines using punchcards.
Your approach would require to use UNIONs for everything, which means
the database will resort to full table scan and sorting for ALL sql
you sunmit.
Need I say more? Why do you want this? Are you up for a career move,
or do you like getting sacked by HP?
Sybrand Bakker
Senior Oracle DBA
If the DBS have to be in different locations, dosn't sound like RAC
would do you much good. What about doing all the work in the Middle
Tier and have your java app connect to all three servers and launch a
seperate query to each one? The oracle app server 9iAS should be able
to deal with all this easily (have to spend money though if you don't
have it) as it's meant to connect to many nodes. I would be leary of
links and union which may come to a screaching hault if one of the DBs
is unavailable.
Not sure how much data you have or how often it gets inserts and
updates, or how up the the minute data your query requires, but look
into materialized views if data and activity set is not too large or
you could use replication to have at least one database with all 3 DBs
data (kind of a data mart approach). This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: channa_s |
last post by:
Hi,
I would be very grateful if anyone could help me with the following. I
want to create a SIMPLE distributed database. It is as follows:
There is a institution which has branches all...
|
by: Richard Maher |
last post by:
Hi,
I am seeking the help of volunteers to test some software that I've
developed which facilitates distributed two-phase commit transactions,
encompassing any resource manager (e.g. SQL/Server...
|
by: DotNetJunkies User |
last post by:
I am writing a distributed transaction code. My current scenario include a client database(Suppose client- having 4 main database) which can be installed anywhere which would connect to a public...
|
by: Avanish Pandey |
last post by:
Hello All
We have 3 differen services (in 3 different server) Service A,B,C . We
want to implement distributed transaction when call methods of B and C
from A. Is it possible? if yes then how?
...
|
by: Joris Dobbelsteen |
last post by:
Dear,
I have some considerations I need to take designing a distributed
application (it's for a school project). Basically I'm looking for some
reference or guidiance material/literature and...
|
by: thunder |
last post by:
Hey!
Suggest me.
What are needed to creat a distributed database library.
Protocol,design,and implementation,etc...
I am a master thesis student.
|
by: gshawn3 |
last post by:
Hi,
I am having a hard time creating a Trigger to update an Oracle
database. I am using a SQL Server 2005 Express database on a Win XP Pro
SP2 desktop, linked to an Oracle 10g database on a...
|
by: dgleeson3 |
last post by:
Hello all
I am creating a VB.Net distributed SQL server 2005 application.
Each computer in the system has a database with a table of users and
their telephone numbers.
Each computer has a...
|
by: J Goldman |
last post by:
I'm looking for documentation pointers to learn what I need to put together
a distributed database system. I've read through "Oracle 9i Database
Administrator's Guide: Distributed Database...
|
by: ryjfgjl |
last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
by: BarryA |
last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
|
by: nemocccc |
last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
|
by: Sonnysonu |
last post by:
This is the data of csv file
1 2 3
1 2 3
1 2 3
1 2 3
2 3
2 3
3
the lengths should be different i have to store the data by column-wise with in the specific length.
suppose the i have to...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers,...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
| |
