Hello,
I already post about that kind of subject in the past and we achieved to succeed it in Java/JDBC mode.
Our issue
We are executing macro statement in a multithreaded batch mode. We just cannot achieve to take advantage of statement cache (cacheFlag=T).
How can we take advantage of statement cache with .NET Teradata provider ?
I'm believing that s not possible to achieve trought .NET Teradata drivers.
Thanks you by advance for your help.
Below some additionals infos :
Code sample
We re using Teradata.Client.Provider 15.00
Sample in c#
// Dedicated open connection to the command
this.command = this.controller.NewConnection().CreateCommand();
this.command.CommandType = System.Data.CommandType.Text;
// setup the macro statement
this.command.CommandText = this.configuredTeradataJob.QueryText;
// Preparing Command Parameter Type;
foreach (TdParameter p in this.configuredTeradataJob.Parameters)
{
TdParameter parameter = command.CreateParameter();
parameter.ParameterName = p.ParameterName;
parameter.DbType = p.DbType;
parameter.Direction = System.Data.ParameterDirection.Input;
this.command.Parameters.Add(parameter);
}
this.command.Prepare();
while(batch) {
// setup parameters value
int indexParameter = 0;
foreach (string arg in args)
{
this.command.Parameters[indexParameter++].Value = arg;
}
// execute
this.command.ExecuteNonQuery();
}
Extract from ".NET Teradata Provider" documentation
Prepare method sends the SQL statement to Teradata Database which parses the statement and returns column information.
When CommandType is set to CommandType.StoredProcedure, TdCommand generates a CALL statement and utilizes the parameter collection to create the stored procedure arguments.
If you call one of the Execute methods after calling Prepare, the Data Provider will utilize the Statement Cache. However, if you call one of the Execute methods without calling Prepare, the .Net Data Provider will not utilize the Statement Cache.
If you change either the CommandText or CommandType property, the TdCommand is no longer in a Prepare state.
We strongly recommend that you Prepare parameterized queries that are executed frequently. That is first set the CommandText property, CommandType property and the Parameter collections. Next, prepare the command once and set parameter values and call execute method repeatedly.
The code is running fine using guidelines from doc.
Data from DBC.dbqlogtbl
SessionID StartTime QueryText CacheFlag ExtraField22
1 919577 03/11/2014 15:59:23.61 HELP SESSION Both
2 919577 03/11/2014 15:59:23.82 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); PrepS
3 919577 03/11/2014 15:59:24.92 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); S Exec
4 919577 03/11/2014 15:59:26.42 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); G Exec
5 919577 03/11/2014 15:59:35.81 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
6 919577 03/11/2014 15:59:37.26 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
7 919577 03/11/2014 15:59:38.92 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
8 919577 03/11/2014 15:59:41.33 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
9 919577 03/11/2014 15:59:42.79 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
10 919577 03/11/2014 15:59:44.26 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
11 919577 03/11/2014 15:59:46.25 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
12 919577 03/11/2014 15:59:48.02 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
13 919577 03/11/2014 15:59:49.37 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
14 919577 03/11/2014 15:59:50.87 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
15 919577 03/11/2014 15:59:52.30 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
16 919577 03/11/2014 15:59:53.66 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
17 919577 03/11/2014 15:59:55.02 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec
18 919577 03/11/2014 15:59:56.48 execute FRDM_PAF.M_PAF_SALES_DAY_ALLOCATION_ALL_DPT(?,?,?,?,?,?,?,?,?); A Exec