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9.0

concurrent run - help needed

Asked by jnefer in Sybase Database

Tags: Sybase, Concurrent Processing

Hi,
We have a requirement to execute a Sybase stored procedure concurrently with 2 or more instances based on the need. Each instance will have different input parameters. This stored procedure has multiple inserts and updates to a single table. And each instance of the SP will populate and update records greater than 50000. Some even upto 200000!
We made the following configuration changes in Database
1)      Changed the row and page lock promotion threshold HWM to 15000
2)      Increased the no of locks in the adaptive server to 200000
Made the following changes in code
1)      Placed each insert and update query within a transaction and added logic to commit each query transaction after every 10000 records were processed. Basically each query is executed in a batch of 10000
2)      Table was created with DATAROWS lock schema
Is this a good approach to achieve concurrency? We tested this approach above and we did not run into deadlocks or exhaust locks in the server but the total run time was increased. We have added a condition in all insert queries to check that record that was inserted in the previous batch loop is not inserted again. so we wonder if that condition increases the run time. not sure though.
Will increasing HWM to 15000 cause a problem? Will it be a better idea to increase the current batch size to 50000 and also increase the lock promotion threshold HWM to a value greater than this batch size?
Providing solutions/ suggestions  as soon as possible will be of great help!
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[+][-]10/14/09 09:09 PM, ID: 25577145Accepted Solution

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Zone: Sybase Database
Tags: Sybase, Concurrent Processing
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Solution Provided By: Joe_Woodhouse
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Solution Grade: A
 
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