1. Move to Oracle Cloud Using Zero Downtime Migration
  2. Zero Downtime Migration Process Phases

D Zero Downtime Migration Process Phases

The migration job process in Zero Downtime Migration runs in operational phases as a work flow. The tables below describe the phases for physical and logical migrations.

Example D-1 Listing Zero Downtime Migration Process Phases

Run the ZDMCLI migrate database command with the -listphases option to list the operational phases for your migration job, as shown here. 

zdmuser> $ZDM_HOME/bin/zdmcli migrate database -sourcedb zdmsdb 
-sourcenode ocicdb1 -srcauth zdmauth -srcarg1 user:opc 
-srcarg2 identity_file:/home/zdmuser/.ssh/zdm_service_host.ppk 
-srcarg3 sudo_location:/usr/bin/sudo -targetnode ocidb1 
-backupuser backup_user@example.com 
-rsp /u01/app/zdmhome/rhp/zdm/template/zdm_template_zdmsdb.rsp
-tgtauth zdmauth -tgtarg1 user:opc 
-tgtarg2 identity_file:/home/zdmuser/.ssh/zdm_service_host.ppk
-tgtarg3 sudo_location:/usr/bin/sudo -listphases

Table D-1 Physical Migration Phase Descriptions

Phase name Online/Offline Useraction scope Description

ZDM_GET_SRC_INFO

Both

 SOURCE

Gets information about the source database

ZDM_GET_TGT_INFO

Both

 TARGET

Gets information about the target database

ZDM_SETUP_SRC

Both

 SOURCE

Sets up Zero Downtime Migration helper modules on the source server

ZDM_SETUP_TGT

Both

 TARGET

Sets up Zero Downtime Migration helper modules on the target server

ZDM_PREUSERACTIONS

Both

 NA

Runs migration pre-user actions, if any, at the source

ZDM_PREUSERACTIONS_TGT

Both

 TARGET

Runs migration pre-user actions, if any, at the target

ZDM_VALIDATE_SRC

Both

 SOURCE

Perform validations at the source

ZDM_VALIDATE_TGT

Both

 TARGET

Performs validations at the target

ZDM_OBC_INST_SRC

Both

 SOURCE

Installs Oracle Database Cloud Backup Module at the source

ZDM_OBC_INST_TGT

Both

 TARGET

Installs Oracle Database Cloud Backup Module at the target

ZDM_BACKUP_FULL_SRC

Both

 SOURCE

Performs full backup of the source database

ZDM_BACKUP_INCREMENTAL_SRC

Both

 SOURCE

Performs incremental backup of the source database

ZDM_DISCOVER_SRC

Both

 SOURCE

Performs database discovery at the source for setting up Data Guard

ZDM_COPYFILES

Both

 NA

Copies Oracle password file and TDE wallets from source to target

ZDM_SETUP_TDE_TGT

Both

 TARGET

Copies TDE wallet files from the source to the target keystore location

ZDM_RESTORE_TARGET

Online

 TARGET

ZDM_RECOVER_TARGET

Online

 TARGET

ZDM_OSS_RESTORE_TGT

Offline

 TARGET

Performs full database restore

ZDM_BACKUP_DIFFERENTIAL_SRC

Offline

 SOURCE

Performs differential backup of the source database

ZDM_OSS_RECOVER_TGT

Offline

 TARGET

Performs incremental restore, recovery database, and opens database with reset logs

ZDM_PREPARE_TGT

Both

 TARGET

Prepares target for Data Guard standby creation

ZDM_CLONE_TGT

Online

 TARGET

Creates Data Guard standby from the Cloud backup

ZDM_FINALIZE_TGT

Both

 TARGET

Finalizes Data Guard standby preparation of the target. Converts the target database to RAC if originally provisioned as Oracle RAC.

ZDM_CONFIGURE_DG_SRC

Online

 SOURCE

Registers the Cloud standby with the source

ZDM_MONITOR_APPLY_LAG

Online

 NA

When the job pauses at ZDM_CONFIGURE_DG_SRC phase, ZDM monitors apply lag periodically in this phase at specified interval.

Note:

This phase is applicable only when value of ZDM_APPLY_LAG_MONITORING_INTERVAL is not None.

ZDM_SWITCHOVER_SRC

Online

 SOURCE

Initiates switchover actions at the source

ZDM_SWITCHOVER_TGT

Online

 TARGET

Completes switchover actions at the target

ZDM_POST_DATABASE_OPEN_TGT

Both

 TARGET

Performs activities after database is opened, such as restore pluggable database state, DBA directories, RMAN configuration

ZDM_DATAPATCH_TGT

Both

 TARGET

Runs datapatch at the target

ZDM_SHUTDOWN_SRC

Both

 SOURCE

Shuts down source database at the end of the migration

ZDM_POSTUSERACTIONS

Both

 NA

Performs any post-migration user actions at the source

ZDM_POSTUSERACTIONS_TGT

Both

 TARGET

Performs any post-migration user actions at the target

ZDM_CLEANUP_SRC

Both

 SOURCE

Performs clean up at the source

ZDM_CLEANUP_TGT

Both

 TARGET

Performs clean up at the target

TIMEZONE_UPGRADE_PREPARE_TGT

 Both TARGET

Performs prepare upgrade operation when the timezone version of the source database is less than the timezone version of the target database.

Skip this phase if the timezone version is same.

Note:

This phase is applicable only when value of the ZDM_TGT_UPGRADE_TIMEZONE parameter is TRUE.

TIMEZONE_UPGRADE_TGT

 Both TARGET

Performs timezone upgrade operation when the timezone version of the source database is less than the timezone version of the target database.

Skip this phase if the timezone version is same.

Note:

This phase is applicable only when value of the ZDM_TGT_UPGRADE_TIMEZONE parameter is TRUE.

Table D-2 Logical Migration Phase Descriptions

Phase name Online/Offline Useraction scope Description

ZDM_VALIDATE_TGT

Both

 TARGET

Verifies that the target database exists, discovers the database type, and validates access credentials, security, and connectivity.

For an Autonomous Database target, sets up the access to the target database from the Zero Downtime Migration node by downloading the target database access wallet with OCI REST services and discovers the target OCPU.

Online only: verifies ggadmin user privileges.

ZDM_VALIDATE_SRC

Both

 SOURCE

Validates the source database access credentials, database parameter settings.

Online only: verifies ggadmin user privileges and GoldenGate capture support for objects in source database.

ZDM_VALIDATE_DATAPUMP_SETTINGS_SRC

Both

 SOURCE

Validates the export directory object (if applicable), and checks for sufficient space and permission for specified user in the source database to export dumps. Checks if the specified Oracle Cloud Object Store buckets, data bucket, and wallet bucket are accessible from the source. Also validates the proxy configuration if applicable.

ZDM_VALIDATE_DATAPUMP_SETTINGS_TGT

Both

 TARGET

Verifies that the Data Pump import directory object exists.

If a pre-existing DBLINK was specified, checks if it exists and is valid, and ensures that the Autonomous Database requirements for the DBLINK and wallet files are met.

For a co-managed target database, ensures that the OCI OSS data bucket and wallet bucket are valid and accessible from the target server. Ensures that the local path to download the dump is valid and has sufficient space.

ZDM_PREPARE_DATAPUMP_SRC

Both

 SOURCE

Creates a new directory object for Data Pump, if required. Creates OCI Auth Token to access OCI OSS bucket if required.

ZDM_DATAPUMP_ESTIMATE_SRC

Both

 SOURCE

Performs Data Pump export dump size estimation.

See also, DATAPUMPSETTINGS_DATAPUMPPARAMETERS_ESTIMATEBYSTATISTICS.

Not used with DBLINK

ZDM_PREPARE_DATAPUMP_TGT

Both

 TARGET

Creates a new directory object for Data Pump, if required. Stores OCI Auth token in the database for secure OSS access.

If migrating via DBLINK, and a DBLINK must be created, creates the necessary database credentials to access the source and create a new DBLINK.

Ensures Autonomous Database security requirements are met using DBLINK over SSL.

ZDM_PARALLEL_EXPORT_IMPORT

Offline

 NA

When using parallel schema migration, this phase, is cumulative of the ZDM_DATAPUMP_EXPORT_SRC, ZDM_UPLOAD_DUMPS_SRC, and ZDM_DATAPUMP_IMPORT_TGT phases, and handles all three actions for a sublist of schemas per thread, that is export, transfer, and import the sublist of schemas in parallel.

ZDM_DATAPUMP_EXPORT_SRC

Both

 SOURCE

Starts and monitors the Data Pump Export on the source database.

ZDM_UPLOAD_DUMPS_SRC

Both

 SOURCE

Uploads Data Pump dump files from the source to OCI OSS.

ZDM_DATAPUMP_IMPORT_TGT

Both

 TARGET

Starts import of Data Pump Dumps to the target database, either from the OCI OSS bucket or via DBLINK, and monitors the Data Pump import progress.

ZDM_DATAPUMP_IMPORT_METADATA_TGT

Both

 TARGET

Imports the generated METADATA_ONLY Dumps in the target database.

ZDM_DATAPUMP_IMPORT_DATA_TGT

Both

 TARGET

Imports the generated DATA_ONLY Dumps in the target database.

ZDM_DATAPUMP_IMPORT_OPTIMISE_TGT

Both

 TARGET

Imports INDEX and STATISTICS by using the METADATA_ONLY dumps.

ZDM_POST_DATAPUMP_SRC

Both

 SOURCE

Removes any Data Pump directory object created by Zero Downtime Migration.

ZDM_POST_DATAPUMP_TGT

Both

 TARGET

Fixes any invalid objects in the target database. Removes the database access and OCI OSS access credentials that were created for the migration. Removes any DBLINK created by Zero Downtime Migration. Optionally, removes source database dumps stored in OCI OSS bucket.

ZDM_POST_ACTIONS

Both

 NA

Removes Autonomous Database access wallet from the Zero Downtime Migration node.

ZDM_PRE_MIGRATION_ADVISOR

Both

 NA

Runs the Oracle Database Premigration Advisor Tool on the migration job.

ZDM_VALIDATE GG_HUB

Online

 NA

Verifies GoldenGate Microservices REST endpoints, software configuration, health, and connectivity to the source and target databases.

ZDM_PREPARE_GG_HUB

Online

 NA

Registers database connection details and credentials with GoldenGate Microservices.

ZDM_ADD_HEARTBEAT_SRC

Online

 SOURCE

Creates GoldenGate heartbeat table in the source database. If the table already exists, sets update frequency to 60 seconds.

ZDM_ADD_SCHEMA_TRANDATA_SRC

Online

 SOURCE

Prepares the source database schemas for instantiation by enabling schema level supplemental logging.

ZDM_CREATE_GG_EXTRACT_SRC

Online

 SOURCE

Starts the GoldenGate Extract process at the source database

ZDM_ADD_HEARTBEAT_TGT

Online

 TARGET

Creates the GoldenGate heartbeat table in the target database. If the table already exists, sets update frequency to 60 seconds.

ZDM_ADD_CHECKPOINT_TGT

Online

 TARGET

Creates GoldenGate checkpoint table in the target database to track Replicat progress.

ZDM_CREATE_GG_REPLICAT_TGT

Online

 TARGET

Creates GoldenGate Replicat process for the target database.

ZDM_START_GG_REPLICAT_TGT

Online

 TARGET

Starts GoldenGate Replicat process for the target database.

ZDM_MONITOR_GG_LAG

Online

 NA

Polls the GoldenGate checkpoint and heartbeat data to measure end-to-end apply lag until lag decreases below desired threshold.

ZDM_SWITCHOVER_APP

Online

 TARGET
Performs any manual validation of the target database if required and performs the switchover for the target database.

Note:

No action is performed by the Zero Downtime Migration workflow.

ZDM_POST_SWITCHOVER_TGT

Online

 TARGET

Performs post-switchover actions for the target database.

ZDM_PREPARE_SWITCHOVER_APP

   SOURCE
Performs the following functions:
  1. Monitors and wait for the ongoing workload on source database to be completed and the source database to become idle.
  2. Stops GoldenGate Extract.
  3. Waits for GoldenGate Replicat to complete the Replicat apply process.
  4. Stops GoldenGate Replicat.

ZDM_RM_GG_EXTRACT_SRC

Online

 SOURCE

Deletes GoldenGate Extract process on source database

ZDM_RM_GG_REPLICAT_TGT

Online

 TARGET

Deletes GoldenGate Replicat process on target database

ZDM_DELETE_SCHEMA_TRANDATA_SRC

Online

 SOURCE

Disables schema level supplemental logging on source database
ZDM_RM_HEARTBEAT_SRC

Online

 SOURCE

Drops the GoldenGate heartbeat table in source database, if the table was created by Zero Downtime Migration. Otherwise, resets update frequency to original setting.

ZDM_RM_CHECKPOINT_TGT

Online

 TARGET

Drops the GoldenGate checkpoint table in the target database.

ZDM_RM_HEARTBEAT_TGT

Online

 TARGET

Drops the GoldenGate heartbeat table in the target database, if the table was created by Zero Downtime Migration. Otherwise, resets the update frequency to the original value.

ZDM_CLEAN_GG_HUB

Online

 NA

Deletes the database connection details and credentials saved with GoldenGate Microservices