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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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oar-database(1) 						   OAR commands 						   oar-database(1)

NAME
oar-database - create/initialize/upgrade/reset/drop the oar database SYNOPSIS
oar-database --create [OPTIONS] oar-database --drop [OPTIONS] oar-database --setup [OPTIONS] oar-database --reset [OPTIONS] DESCRIPTION
Manage the oar database. --setup Initialize/Upgrade an existing database. --reset Reset an existing database. --create Create and initialize a new database/user. --drop Drop an existing database/user. OPTIONS
General parameters --conf=OAR_CONF_FILE Define the oar configuration file to use. By default /etc/oar/oar.conf is used. This file doesn't exist, the default parameters for each value are used. --update-conf The database parameters given in the command line are writen to the OAR_CONF_FILE -h,--help Display this help. -d,--debug Display more information during the script execution -f,--force-sql Force to resume the execution even if an sql instruction fails -y,--force-yes This option will cause oar-database to continue without prompting if it is doins something potentially harmful Database admin parameters These parameters are only needed for database/user creation or removing. --db-is-local For --create or --drop, this option tells that the database is local. oar-database can use local admin account to execute command (useful for postgres). --db-admin-user=DB_ADMIN_USER For --create or --drop, this option gives the privilegied user to use. --db-admin-pass=DB_ADMIN_PASS For --create or --drop, this option gives the privilegied user pass to use. SQL parameters By default, if not specified, all the sql parameters are taken from the OAR_CONF_FILE. It is preferable to set these values directly to this file. --db-type=DB_TYPE The type of the SQL database. It can be currently, mysql or Pg (for postgresql). --db-user=DB_USER Connect to the database as the user DB_USER instead of the one given in OAR_CONF_FILE. By default, if OAR_CONF_FILE doesn't specify a user, it is oar. --db-pass=DB_PASS Connect to the database with the password DB_PASS instead of the one given in OAR_CONF_FILE. --db-host=DB_HOST Connect to the database on the host DB_HOST, By default, if OAR_CONF_FILE doesn't specify a host, it is localhost. --db-port=DB_PORT Connect to the database on the port DB_PORT, By default, if OAR_CONF_FILE doesn't specify a port, the value depend on the DB_TYPE. if DB_TYPE is mysql, DB_PORT is 3306. If DB_TYPE is postgresql, DB_PORT is 5432. --db-name=DB_NAME Connect to the database on the host DB_HOST, By default, if OAR_CONF_FILE doesn't specify a database name, it is oar. --db-ro-user=DB_RO_USER same as --db-user except that it is for the read only access. --db-ro-pass=DB_RO_PASS same as --db-pass except that it is for the read only access. EXAMPLES
Mysql First you need to specify the sql parameters in /etc/oar/oar.conf. These parameters will be used by oar-database. To create a new database (assuming that the sql root password is PASS): oar-database --create --db-admin-user root --db-admin-pass PASS To upgrade an existing database: oar-database --setup Postgresql First you need to specify the sql parameters in /etc/oar/oar.conf. These parameters will be used by oar-database. Then if your postgresql database is on the local system, you can use the option --db-is-local (otherwise, the procedure is the same as Mysql). So oar-database will use the postgres unix user to administrate the database (you need privilegied access to the local system). To create a new database: oar-database --create --db-is-local To upgrade an existing database: oar-database --setup Advanced usages To make some tests or to administrate several databases, you can also specify the sql parameters on the command line. For example: oar-database --create --db-type=Pg --db-host=HOST --db-user=oar --db-pass=PASS --db-admin-user=ADMIN_USER --db-admin-pass=ADMIN_PASS will create the oar database and the oar user on the postgresql system hosted by HOST. The user ADMIN_USER must have the right to create new databases and new roles on this system. FILES
/usr/lib/oar/database/mysql_structure.sql, /usr/lib/oar/database/pg_structure.sql SQL instructions for creating the structure of the oar database. /usr/lib/oar/database/mysql_default_admission_rules.sql, /usr/lib/oar/database/pg_default_admission_rules.sql SQL instructions for inserting the default admission rules in the oar database. /usr/lib/oar/database/default_data.sql SQL instructions for inserting the default data in the oar database. /usr/lib/oar/database/mysql_reset_structure.sql, /usr/lib/oar/database/pg_reset_structure.sql SQL instruction for emptying an existing oar database. /usr/lib/oar/database/mysql_structure_upgrade_*.sql, /usr/lib/oar/database/pg_structure_upgrade_*.sql SQL instructions for upgrading an existing database. oar-database 2012-06-26 oar-database(1)
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