@saikrishnaCSK  please go through past questions on this subject.  You should check out previous questions, and responses such as @SuhasKumar 's observations in the following:

Pega Upgrade to 24.1

Regarding Pega Upgrade from 8.3.2 to pega 24

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Upgrade Path Overview

The upgrade from 8.7.2 to 23.1.1 needs to be performed in stages due to the significant version gap. Here's the recommended approach:

1. Pre-upgrade Assessment
   • Review system requirements for target version
   • Backup your existing database
   • Document current customizations
   • Check application compatibility
2. Environment Preparation
   • Verify Tomcat and PostgreSQL versions meet the requirements
   • Ensure sufficient system resources
   • Create a rollback plan
   • Set up a test environment for validation
3. Staged Upgrade Process
   • First stage: 8.7.2 → 8.8.x
   • Second stage: 8.8.x → 9.x
   • Final stage: 9.x → 23.1.1

For the most current and detailed information, I recommend reviewing the complete upgrade documentation in the Pega Support Portal. You may also want to engage with Pega Support to discuss any specific concerns about your environment.

References:

1. Updating Pega Infinity for on-premises environments
2. On-premises update process for Pega Infinity release 8.4.2 and later for Tomcat and PostgreSQL
3. Support documentation for version-specific upgrade paths
4. Platform Support Guide
5. Pega Platform technology support roadmap
6. Support for deployment types between Pega Platform 8.7 through Pega Platform '25