02-20-2019
Quote:
Originally Posted by
figaro
I have a big, ugly query which is quadratic in the input size and therefore want to display an approximate completion time prior to sending it off:
I don't see the link between what you want and the query and like you have said it's not correct. So, to analyze the query you have the explain command to get information about the plan that will be used and from there you can estimate quick query and slow query.
See the official web site for "EXPLAIN"
The other option is to do it on the application side.
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LEARN ABOUT PHP
ingres_prepare
INGRES_PREPARE(3) 1 INGRES_PREPARE(3)
ingres_prepare - Prepare a query for later execution
SYNOPSIS
mixed ingres_prepare (resource $link, string $query)
DESCRIPTION
Prepares a query for execution by ingres_execute(3).
The query becomes part of the currently open transaction. If there is no open transaction, ingres_query(3) opens a new transaction. To
close the transaction, you can call either ingres_commit(3) to commit the changes made to the database or ingres_rollback(3) to cancel
these changes. When the script ends, any open transaction is rolled back (by calling ingres_rollback(3)). You can also use ingres_autocom-
mit(3) before opening a new transaction to have every SQL query immediately committed.
Note
Related Configurations
See also the ingres.describe, ingres.scrollable and ingres.utf8 directives in Runtime Configuration.
PARAMETERS
o $link
- The connection link identifier
o $query
- A valid SQL query (see the Ingres SQL reference guide) in the Ingres documentation. See the query parameter in ingres_query(3)
for a list of SQL statements which cannot be executed using ingres_prepare(3)
RETURN VALUES
ingres_prepare(3) returns a query result identifier that is used with ingres_execute(3) to execute the query. To see if an error occurred,
use ingres_errno(3), ingres_error(3), or ingres_errsqlstate(3).
SEE ALSO
ingres_unbuffered_query(3), ingres_fetch_array(3), ingres_fetch_assoc(3), ingres_fetch_object(3), ingres_fetch_row(3), ingres_commit(3),
ingres_rollback(3), ingres_autocommit(3), ingres_set_environment(3), ingres_errno(3), ingres_error(3).
PHP Documentation Group INGRES_PREPARE(3)