# Metacat: Metadata and Data Management Server

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# Read-only Mode

Metacat has a feature to place itself in a read-only mode - its content can NOT be modified, however, can be read and searched. The default setting of Metacat is the not-read-only mode. You may make Metacat read-only by setting the value of a property to “true” on the metacat.properties file, then restart Tomcat.

    application.readOnlyMode=true

To cancel the read-only mode, set the property back to “false”, then restart Tomcat.

    application.readOnlyMode=false

When Metacat is in the read-only mode, the following Metacat and DataONE API methods are disabled.

Metacat API:

- upload
- insert
- update
- delete
- setaccess
- buildindex
- reindex
- reindexall
- scheduleWorkflow
- unscheduleWorkflow
- rescheduleWorkflow
- deleteScheduledWorkflow
- forcereplicatedatafile
- forcereplicate
- forcereplicatesystemmetadata
- forcereplicatedelete
- forcereplicatedeleteall
- replicate.update
- replicate.start

DataONE Member Node API:

- MN.create
- MN.update
- MN.archive
- MN.delete
- MN.replicate
- MN.systemMetadataChanged
- MN.updateSystemMetadata

Mehtods on the DataONE Coordinating Node API are not disabled because the Coordinating Nodes currently have a different read-only mechanism.