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Full Discussion: Executing SQL's in parallel
Top Forums UNIX for Beginners Questions & Answers Executing SQL's in parallel Post 303041072 by member2014 on Wednesday 13th of November 2019 07:53:47 PM
Old 11-13-2019
Executing SQL's in parallel

Hi Folks,

I have requirement to pull a bunch of SQL's from a table in DB and execute them in parallel and update the status of each query as and when they complete. Can you please help me with ideas on how this can be achieved?

Code:
 
create table list_of_sql
(
id number,
full_sql varchar2(255),
status varchar2(50),
create_dt timestamp,
update_dt timestamp
)

id - auto-generated number
full_sql - will have the sql to be executed
status - P : Pending (when the sql is added but not picked up for execution yet)
A : Active (Once the query is picked up for execution and is running)
C : Completed (Once the query execution has completed)

It will be easy to do this sequentially but the requirement is to run the sql's in parallel and at a time there will be no more than 10 sql;s in the table.

Thanks in advance.
 

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PDO.QUERY(3)								 1							      PDO.QUERY(3)

PDO
::query - Executes an SQL statement, returning a result set as a PDOStatement object SYNOPSIS
public PDOStatement PDO::query (string $statement) DESCRIPTION
PDOStatement PDO::query (string $statement, int $PDO::FETCH_COLUMN, int $colno) PDOStatement PDO::query (string $statement, int $PDO::FETCH_CLASS, string $classname, array $ctorargs) PDOStatement PDO::query (string $statement, int $PDO::FETCH_INTO, object $object) PDO.query(3) executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object. For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO.pre- pare(3) and issue the statement with multiple calls to PDOStatement.execute(3). If you do not fetch all of the data in a result set before issuing your next call to PDO.query(3), your call may fail. Call PDOState- ment.closeCursor(3) to release the database resources associated with the PDOStatement object before issuing your next call to PDO.query(3). Note Although this function is only documented as having a single parameter, you may pass additional arguments to this function. They will be treated as though you called PDOStatement.setFetchMode(3) on the resultant statement object. PARAMETERS
o $statement - The SQL statement to prepare and execute. Data inside the query should be properly escaped. RETURN VALUES
PDO.query(3) returns a PDOStatement object, or FALSE on failure. EXAMPLES
Example #1 Demonstrate PDO::query A nice feature of PDO.query(3) is that it enables you to iterate over the rowset returned by a successfully executed SELECT state- ment. <?php function getFruit($conn) { $sql = 'SELECT name, color, calories FROM fruit ORDER BY name'; foreach ($conn->query($sql) as $row) { print $row['name'] . " "; print $row['color'] . " "; print $row['calories'] . " "; } } ?> The above example will output: apple red 150 banana yellow 250 kiwi brown 75 lemon yellow 25 orange orange 300 pear green 150 watermelon pink 90 SEE ALSO
PDO.exec(3), PDO.prepare(3), PDOStatement.execute(3). PHP Documentation Group PDO.QUERY(3)
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