MDEX Engine Configuration and Processing
This section describes how the MDEX Engine handles partial updates.
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MDEX Engine Partial Updates Guide
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Preface
About this guide
Who should use this guide
Conventions used in this guide
Contacting Oracle Support
Partial Updates Processing and Requirements
Introduction to partial updates
Interaction with the Deployment Template
Partial update capabilities
Supported operations
Unsupported operations
Introduction to partial updates processing
MDEX Engine processing for partial updates
Integrity of generation files upon recovery
Continuous query
MDEX Engine startup behavior
Continuous query processing and administrative queries
The dgraph_input directory
The dgraph_input/updates directory
Requirements for baseline and partial updates
General requirements for partial and baseline updates
Adding new leaf dimension values to records in partial updates
Record specifier attribute required for partial updates
MDEX Engine Configuration and Processing
Enabling the MDEX Engine for partial updates
MDEX Engine Thread Requirements for Partial Updates
Processing the partial update files
Running updates on a single file
Setting the merge policy
Dgraph mergepolicy flag
URL mergepolicy command
Performing one-time merges
Changing the current merge policy
Listing the update files that were processed
Backing Up Baseline and Partial Updates
Types of backups
About baseline backups
About snapshot backups
About incremental backups
Backup recommendations
Recovering the index
Troubleshooting Partial Updates
Pipeline troubleshooting recommendations
Troubleshooting update operations that fail
UPDATE_RECORD errors
The Dgraph checks permissions on the index directories
Performance impact of partial updates
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