Oracle

Oracle Query Optimizer generally works well, but sometimes it makes your fast and polished queries slow down. Often, you can not simply add hints and recompile them on production environment. In such case be ready to use dbms_spm package. Don’t forget about appropriate grants.grant select on V_$SESSION to test;grant select on V_$SQL_PLAN to test;grant select …

Oracle DB. Changing and fixing query execution plan using dbms_spm. Read More »

Oracle has an interesting package to provide an event-based logic named dbms_alert. In this article I will use it to create a classic queue processing. First, we need to create a simple table, which store queue message ID and creation time. create table t_queue ( id_queue number primary key, d_add timestamp default systimestamp not null …

Oracle DB. Using dbms_alert for queuing and parallel data processing. Read More »

In this article I will show you how to create Oracle queues, pull messages and push them using subscriber. Before we begin, please, grant dbms_aqadm and dbms_aq execute privileges to user. Queue table use an object data type to transfer message data. Let’s create it first. create or replace type tp_queue as object(n number); Second, …

Oracle DB. Advanced Queuing. Simple subscriber example. Read More »