Introduction

This document serves as a Root Cause Analysis for the service interruption experienced by Ex Libris customers.
The goal of this document is to share our findings regarding the event, specify the root cause analysis, outline actions to be taken to solve the downtime event, as well as preventive measures Ex Libris is taking to avoid similar cases in future.

Event Timeline

Service interruption was experienced by Ex Libris customers served by the Higher-Ed Platform EU00 instance at the Amsterdam Data Center on October 25, 2022
during the following time frame:

From 14:21 until 14:37 Amsterdam time.

Root Cause Analysis

Ex Libris Engineers investigated this event to determine the root cause with the following results:

A DB internal configuration issue was found, that eventually caused  internal DB locks during application transactions, which subsequently caused a high load on the database server and to some DB processes to hang

Once the issue was identified, the hanged processes were killed and the system was recovered to full functionality.

Technical Action Items and Preventive Measures

Ex Libris has taken the following action and preventive measures to avoid such an occurrence in future:

• Work with the DB vendor to improve DB  configuration

• Tune DB internal configuration

• Tune and approve application queries and configuration

Customer Communication

ExLibris is committed to providing customers with prompt and ongoing updates during Cloud events. Ongoing and prompt updates on service interruptions appear in the system status portal at this address: http://status.exlibrisgroup.com/

These updates are automatically sent as emails to registered customers.