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Скачать или смотреть Why does my TRIGGER cause an ORA-29270 error while a normal PROCEDURE does not in Oracle 10g?

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  • 2025-02-20
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Why does my TRIGGER cause an ORA-29270 error while a normal PROCEDURE does not in Oracle 10g?
ORA-29270: too many open HTTP requestsWhy does my TRIGGER cause an ORA-29270 error while a normal PROCEDURE does not?oracle10gplsql
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Описание к видео Why does my TRIGGER cause an ORA-29270 error while a normal PROCEDURE does not in Oracle 10g?

Understanding the ORA-29270 error caused by triggers in Oracle 10g and why it does not occur in normal procedures.
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Why Does My TRIGGER Cause an ORA-29270 Error While a Normal PROCEDURE Does Not in Oracle 10g?

When working with Oracle 10g PL/SQL, you might encounter various errors that can hinder the seamless execution of your database operations. One such error is the ORA-29270: "too many open HTTP requests." Understanding why this error occurs in a TRIGGER but not in a normal PROCEDURE can save significant debugging time and effort.

Understanding ORA-29270

The ORA-29270 error indicates that there are too many open HTTP requests. This error is typically related to the UTL_HTTP package in Oracle, which is used for making HTTP callouts from within the database. When using UTL_HTTP, Oracle imposes certain limitations on the number of open HTTP requests that can be handled simultaneously.

Why It Happens in TRIGGERS But Not in PROCEDURES

The key distinction lies in the nature and context of their execution:

TRIGGERS Execution Context:

TRIGGERS are automatically invoked in response to a specified event on a particular table or view.

They run as part of the transaction that fired them and typically execute in a more restrictive environment.

Because a trigger is tightly coupled with the transaction, it inherits the transaction's limitations, including HTTP requests constraints.

PROCEDURES Execution Context:

PROCEDURES, on the other hand, are explicitly called by an application or user.

They execute in a broader context and generally have more relaxed resource constraints.

If a procedure makes multiple HTTP requests, it can manage and close these connections more efficiently because it isn't bound by the same tight integration to a single transaction as a trigger.

Because triggers operate within stricter transactional confines, they are more susceptible to running into the open HTTP requests limit.

Best Practices to Avoid ORA-29270

To mitigate the occurrence of the ORA-29270 error, consider the following tips:

Limit HTTP Requests in Triggers: Minimize the number of HTTP requests made within a trigger. Evaluate whether the necessary HTTP calls can be deferred to a stored procedure that is invoked post-transaction.

Properly Close HTTP Requests: Ensure that you always close HTTP requests properly by using UTL_HTTP.end_response.

Resource Management: Monitor your HTTP request usage and implement resource management practices to keep the number of open requests within permissible limits.

By understanding the inherent differences in the operational contexts of triggers and procedures, you can design your Oracle PL/SQL applications to avoid the pitfalls of ORA-29270 and ensure robust and efficient database interactions.

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