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How to Prevent Deadlocks

How to Prevent Deadlocks

How to Prevent Deadlocks


I am scripting in powershell to read from table, and then update table.

It works very well - except when another user or program is trying to read or update the table at the same time.

This is unavoidable, so I would like to know how to prevent transaction deadlocks.

Here is code to read from the large table



$sql = SQL statement to read table 

$cmd = New-Object System.Data.SqlClient.SqlCommand($sql,$conn)

$rdr = $cmd.ExecuteReader()

while ($rdr.read()){
    $sql_output += ,@($rdr.GetValue(0), $rdr.GetValue(1), $rdr.GetValue(2), $rdr.GetValue(3))


Here is code to update the large table:



$sql_update = SQL statement to update table

$cmd_update = New-Object System.Data.SqlClient.SqlCommand($sql_update,$conn_update)

$found = $cmd_update.ExecuteNonQuery()  


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