Plperl caching prepared queries and cleanup

[Anupama <anupama.mr@xxxxxxxxx>]

Hi,

I am trying to use plperl for one of my triggers. The trigger executes a 
query.
So I am preparing the query and caching it as below:

       if (!defined $_SHARED{'base_table_query'}) {

           my $base_columns_query = "select column_name from
                                   information_schema.columns where 
table_schema = '$_TD->{table_schema}'
                                   and table_name = \$1";
           $_SHARED{'base_table_query'} = 
spi_prepare($base_columns_query, 'text');
       }

       $result = spi_exec_prepared($_SHARED{'base_table_query'}, 
$base_table_name);

Now, in a batch update (involving 1000s of records), the trigger itself 
fires for each update.
I will get maximum performance benefit, if I can keep the prepared query 
in the global cache across trigger invocation.

In effect, there is no logical point to call spi_freeplan()

Will the plan be freed when the db session / connection closes OR
Will it lead to any memory leaks ?

Thanks
Anupama.



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