Secodary database consistency question

hello!
We have got an idea - to increase performance, we want to combine our database with objects, needed to be processed, together with objects which are already processed. The processed flag is kept inside a record. What we want, is to create 2 secondary databases - with processed records and with pending records. To do this, we want to create 2 secondary key creators, which will check a flag property in record, and decide whether record needs to be included into pending records or processed records. The pending records should also be ordered (there is a property with the record's order), used as a key for secondary database
Now we would like to know - is it possible to do in this way? In javadocs for SecondaryKeyCreator there is a statement, which tells the resulting key needs to be the same for given primary key and value entries. Would we violate the constraint, in case if we have a record A with processed flag set to false (the key appears in "pending" secondary database), then we get this record, process it and place into a database with processed flag set to true - and now the record should disappear from pending secondary database but appear in processed database? In another words, first time key creator for pending database returns true for the record, and secondary key creator for processed database returns false, but when the record becomes to be processed - secondary key creator for pending database returns false, and secondary key creator for processed database returns true?

Hi Eugene,
Sure, that will work fine. To satisfy the constraint, just make sure that the pending flag is stored as a field in the primary data. The constraint is that secondary keys, returned by the secondary key creator method, must be derived from information in the primary key and/or data. Given inputs X and Y (primary key and data) it returns a result Z. JE may call this method at any time. Given the same inputs X and Y it must always return the same result Z.
An example of a secondary key creator that is wrong -- that violates the constraint by returning different results at different times -- is a creator method that uses a timestamp or another external counter to create the secondary key.
Mark

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[SAP Note 947702 DB13 - DBCC Checkdb job fails in SQL 2005 SP1|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_bc_db/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d393437373032%7d]
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I do an incermental backup every day at 02:00
IncrementalBackup-Job
Mon Sep 17 02:00:00 EST 2012
Mon Sep 17 02:00:02 EST 2012
Completed
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System Alarm [Database Purging]
Mon Sep 17 04:00:00
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http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_system/5.3/user/guide/admin_operations.html#wp1076238
Tarik Admani
*Please rate helpful posts*

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i am using Java 1.5.0_06 and to connect to MySQL database i use Connector/J and the following code:
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ps = con.prepareStatement(
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can the The JDBC 2.0 Optional Package work with Java 1.5.0_06?

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--------------------------------------------------------------------------------------

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Hi,
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solution, what happens when one would need more than one
Database Server?
How does one go about implementing that solution?
Is there some way to have two database servers carrying the
same information with some kind of load balancing solution
in front of it(?) or does one place some tables on one
Database
server, and other tables on the other database server?
(I have no clue as to how things would work.)
Thanks in advance,
Joe

Microsoft SQL allows for clustering of SQL databases, so for
instance two servers connected to a fileshare and a virtual address
shared across the two physical boxes. Database connections are made
to the virtual addres which will then be handled by the active
node. Becuase a database is ultimately a file(s) on a disk it can
only be attached to one node at a time so you end up with an
active/inactive cluster.

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Disclaimer: I am new to DB's.
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thanks for your response

lduren wrote:
I am planning a new database application using java and mysql. I may want to use some triggers to automatically update the tables when a change is made. my question is this: If I write the trigger, and I use Java to modify the database, will java automatically pause and let the trigger finish doing its task before it continues? what if it writes more to the table before the trigger is finished modifying the table? how do I get java to pause and let the trigger finish?
It doesn't have anything to do with java at that point.
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Question
I'm missing something simple.
I'm trying to create a view, from a Database Link.
CREATE VIEW view_name
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When I run this in the SQL Commands window.
I get this error message.
ORA-00933: SQL command not properly ended
What am I missing? Any help is appreciated...

CREATE VIEW vw_name
AS SELECT a.*
FROM [email protected] a;

 
1) User (schema) which is creating view must have proper db_link to source database. For that try this for testing purpose:
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2) when db_link is set, then your view should be named as:
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I have some database related questions

hey all
i am currently designing a java GUI program for a dvd renting shop.
this program obviously needs a databse, i was just wondering how much possibly a database on a home pc could hold data because this shop have about 15000 DVD title and about 1500 client so i was wondering how much a mySQL databse table could hold....
i also have another question...this shop have an access database...my question is can i use the existing database and querie it from my java program??? do i need a driver ??? can i querie an acces databse just like a regular SQL databse(e.g. SELECT * FROM TABLENAME) ????

hey all
i am currently designing a java GUI program for a dvd
renting shop.Why not simply download JBoss Seam's DVD store example. It's fully coded for you already!
this program obviously needs a databse, i was just
wondering how much possibly a database on a home pc
could hold data because this shop have about 15000
DVD title and about 1500 client so i was wondering
how much a mySQL databse table could hold....
You will not have issues even with Access with that few a number of rows. Disk is really the only limitation on the size of the database. (There can be O/S or database specific limitations, such as 2GB of total size). So, do not worry about how many records.
When you truly get a large number of records (tens of millions plus) or you are joining two large tables, then you can have performance issues. Good use of primary keys, indexes and database design can limit this issue.
i also have another question...this shop have an
access database...my question is can i use the
existing database and querie it from my java
program??? do i need a driver ??? can i querie an
acces databse just like a regular SQL databse(e.g.
SELECT * FROM TABLENAME) ????You can use Access, mySQL, Postgres or any number of other databases. Each will require (and will have on their site) a JDBC driver that you need to have on your application's CLASSPATH. My recommendation would be mySQL or Postgres. Both are free and excellent quality.
As an aside, you should rarely SELECT * from any table (other than a code or lookup table). Use a WHERE clause to limit results. What user would possibly want to scroll through ALL 15,000 records? :^)
- Saish

MySQL Database Structure Question

This is probably going to seem a little odd, but I need some outside opinions. I'm using Dreamweaver CS5 to build a business website. When all is said and done, it's going to have around 20,000 items (not anytime soon, but it'll get there). I'm using a dynamic data set up to load the inventory because I'm way too lazy to build that many pages and links one at a time.
The corporate chain has two sections, lighting, and electrical supply. I want the database to hold the product ID(of course), name, description, image(this is part of where the question comes in), price, sale price(discounts not our cost), an enum field for whether or not the item is discontinued(for our own records), size / weight for shipping reasons, and if reality is permitting, a field for color selection of the products.
My original idea was to have two tables, one for lighting, one for electrical. Somebody pointed out to me that this could fail because they pointed out that some of the items might have multiple images, which is true. Some of the items (like some of the fans we sell) have different colors but still cost the same. They suggested I set the images up in a seperate table and use a foreign key. but that changes my entire structure.
Does anyone mind offering ideas on how I might set that up to avoid data redundancy and other problems that might pop up due to repeat listings? I've got the images all with unique names (in the case of the same product in different colors, I added a color code like pb for polished brass, etc.) That person had an excellent point on multiple tables, so now I'm wondering about a better and more reliable structure.

I'm ok with PHP, and usually pretty good with databases. Right now I've got enough sample stuff to build a smaller scale prototype with about 200 products, from both lighting and electric. Believe me, I haven't really done much more than start with the layout, because the many to many relationships just didn't occur to me. Pretty much going solo on this project with occasional advice from one co-worker who's good at his job but extremely busy, so I think I just got a little to close to it and overlooked some clear and obvious problems. As far as requirements, I'm using a 3 column div tag layout, the left column being the nav bar with the product categories. When they click one of those, it should display that category (image, name, price) with the clickable name and thumbnail image in the middle, and from there they click the product they want to see and it'll display the full size image and full description on the right column.
Set requirements...wish I had a clear list, but the bosses are pretty much illiterate in this area of computers, so I'm on my own with that. That's all I'm hoping to get out of the database is that three column layout. I figure I'll make a changeable nav bar later so customers can switch from one store to the other and the nav bar goes from there.
We're hoping to get the database to have the fields I mentioned for now (at least for initial testing) and maybe add an inventory tracking function so we know how many we have throughout the chain. We're not worried about that part now, just getting them up and selling cuz our current inventory system works just fine. How would 10 or more tables be better? Just breaking down the amount of products to be searched at a time, or is that how detailed you think it should be built? Don't worry, I wasn't hanging everything on a two table set up, I knew there would be room for much improvement.
Current basic layout:
Lighting / Electric Tables Image table: ID (either the product ID without the color code or maybe the document path), category(lighting / electric), subcategory (fan, lamp, etc)
id
class
category
description
price
sale price
discontinued
size
weight
That's what I've got so far, sorry for the weird way that list pasted....

Secodary database consistency question

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