mlmd.downgrade_schema
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Downgrades the db specified in the connection config to a schema version.
mlmd.downgrade_schema(
config: proto.ConnectionConfig, downgrade_to_schema_version: int
) -> None
If downgrade_to_schema_version is greater or equals to zero and less than
the current library's schema version, it runs a downgrade transaction to
revert the db schema and migrate the data. The update is transactional, and
any failure will cause a full rollback of the downgrade. Once the downgrade
is done, the user needs to use the older version of the library to connect to
the database.
Args |
|---|
config
|
a proto.ConnectionConfig having the connection params.
|
downgrade_to_schema_version
|
downgrades the given database to a specific
version. For v0.13.2 release, the schema_version is 0. For 0.14.0 and
0.15.0 release, the schema_version is 4. More details are described in
g3doc/get_start#upgrade_mlmd_library
|
Raises |
|---|
errors.InvalidArgumentError
|
if the downgrade_to_schema_version is not
given or it is negative or greater than the library version.
|
RuntimeError
|
if the downgrade is not finished, return detailed error.
|
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Last updated 2025-04-18 UTC.
[null,null,["Last updated 2025-04-18 UTC."],[],[],null,["# mlmd.downgrade_schema\n\n\u003cbr /\u003e\n\n|--------------------------------------------------------------------------------------------------------------------------------------|\n| [View source on GitHub](https://github.com/google/ml-metadata/blob/v1.17.0/ml_metadata/metadata_store/metadata_store.py#L1987-L2027) |\n\nDowngrades the db specified in the connection config to a schema version. \n\n mlmd.downgrade_schema(\n config: proto.ConnectionConfig, downgrade_to_schema_version: int\n ) -\u003e None\n\nIf `downgrade_to_schema_version` is greater or equals to zero and less than\nthe current library's schema version, it runs a downgrade transaction to\nrevert the db schema and migrate the data. The update is transactional, and\nany failure will cause a full rollback of the downgrade. Once the downgrade\nis done, the user needs to use the older version of the library to connect to\nthe database.\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n| Args ---- ||\n|-------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `config` | a `proto.ConnectionConfig` having the connection params. |\n| `downgrade_to_schema_version` | downgrades the given database to a specific version. For v0.13.2 release, the schema_version is 0. For 0.14.0 and 0.15.0 release, the schema_version is 4. More details are described in g3doc/get_start#upgrade_mlmd_library |\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n| Raises ------ ||\n|------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------|\n| [`errors.InvalidArgumentError`](https://www.tensorflow.org/api_docs/python/tf/errors/InvalidArgumentError) | if the `downgrade_to_schema_version` is not given or it is negative or greater than the library version. |\n| `RuntimeError` | if the downgrade is not finished, return detailed error. |\n\n\u003cbr /\u003e"]]
View source on GitHub