mirror of the data in a table separated through trigger
Oracle 11g r2.
Table_account holds public user and professional info for registration (public username, name, address, logo)
(this table can contain 1 million records)
Table_skill(Technician Name), table_skill_child, table_skill_grand_child, table_skill_ext
When the search for technical info, the sql will be executed against the Table_skill. However, given that I also need to get the company name, address and information of logo with the technician information, there are two approaches:
(1) join Table_account and Table_skill, table_skill_child, table_skill_grand_child, table_skill_ext
Select the name of the technician, name, address, company logo
Table_account Table_skill, table_skill_child, table_skill_grand_child, table_skill_ext
where the...
PRO: simple join
CON: public user info is not necessary at all (this could potentially slow down the query speed?)
(2) reflect the data, that is when the company data to the Table_account, use relaxation to copy the name of the company, save him address and logo on the Table_skill. When looking for technicians, it will be fast, no need to exclude the public user names the table_account
Select the name of the technician, name, address, company logo
of Table_skill.
table_skill_child, table_skill_grand_child, table_skill_ext
where the...
PRO: table_account, which contains the unwanted public modules is eliminated
CON: deduplication of data for example, the logo in several tables
Want to hear your opinion.
Thank you
Scott
Hi, Scott.
scottjhn wrote:
Oracle 11g r2.
Table_account holds public user and professional info for registration (public username, name, address, logo)
(this table can contain 1 million records)
Table_skill (name)
When the research is done, the sql will be executed against the Table_skill. However, given that I also need to get the company name, address and logo information, there are two approaches:
(1) join Table_account and Table_skill
Select the name of the technician, name, address, company logo
of Table_account Table_skill
where the...
PRO: simple join
CON: public user info is not necessary at all (this could potentially slow down the query speed?)
(2) reflect the data, that is when the company data to the Table_account, use relaxation to copy the name of the company, save him address and logo on the Table_skill. When looking for technicians, it will be fast, no need to exclude public usernames
Select the name of the technician, name, address, company logo
of Table_skill
where the...
PRO: a table involved
CON: duplicate data, such as the logo in several tables
Want to hear your opinion.
Thank you
Scott
Another "con" is the difficulty of maintaining the data. As you say, the performance will be better when doing a query that contains the replicated data, but DML will be slower. Depending on how often you are DML and how many times you make queries that would benefit the denormalization, the benefit may or may not justify the costs.
There are many problems involved with triggers, in addition to the performance. A materialized view can be a better option, especially if you can tolerate slightly obsolete results (i.e. ' stale').
This sort of thing is often done in Data Warehouse applications, where DML is frequent. Search for the words "Data Warehouse", "Denormaliztion" and "Réplication" to learn more about the subject.
Most of the time, people join in situations like yours.
Tags: Database
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****************************************************
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I had to do in the past, and this is the approach I used. Create two variables, one for a number of records and the other as an index of the loop. The index of the loop the value 1 and get a number of nodes in the xml data in the entry for the second variable. Then the loop through the input xml data while the loop index is less than the record number, set the value of your table and incrementing the index of the loop, the use of brackets around the loop index (i.e. open close bpws:getVariableData('Variable_loopIndex') of the angle. I see that when I post this message, this part of the code is eating, and in my browser at least when I replace the ASCII for support, it is displayed instead of the media.There might be better ways to address the issue, but it worked for my process. I have not tested the below with your types to xml schema, but here's an example of how this can stand as a model using my code:
condition = "bpws:getVariableData('Variable_loopIndex') < = bpws:getVariableData('Variable_recordCount')" > "
Query = "/ ns2:CashReceipt / ns2:Detail / ns2:receipt_number [bpws:getVariableData('Variable_loopIndex')]" / > ""
Query = "/ ns9:Details / ns9:ReceiptArr [bpws:getVariableData('Variable_loopIndex')]" / > ""
Hope this helps
CandacePublished by: cmcavaney on June 25, 2009 08:26
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