Strict act-as mode is enforced globally for all Dataform repositories, requiring the use of a

## Breaking Breaking [Strict act-as mode](https://cloud.google.com/dataform/docs/strict-act-as-mode)is enforced globally for all Dataform repositories, requiring the use of a custom service account or user credentials for running Dataform workflows, BigQuery pipelines, notebooks, and data preparations. ## Feature Feature You can now use the[VECTOR\_INDEX.STATISTICS function](https://cloud.google.com/bigquery/docs/reference/standard-sql/vectorindex%5Ffunctions#vector%5Findexstatistics) to calculate how much an indexed table's data has drifted between when a vector index was created and the present. If table data has changed enough to require a [vector index rebuild](https://cloud.google.com/bigquery/docs/vector-index#rebuild%5Fa%5Fvector%5Findex), you can use the[ALTER VECTOR INDEX REBUILD statement](https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language#alter%5Fvector%5Findex%5Frebuild%5Fstatement)to rebuild the vector index without downtime. These features are[generally available](https://cloud.google.com/products/#product-launch-stages)(GA). ## Feature Feature You can now use the `PARTITION BY` clause of the[CREATE VECTOR INDEX statement](https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language#create%5Fvector%5Findex%5Fstatement)to [partition TreeAH vector indexes](https://cloud.google.com/bigquery/docs/vector-index#partitions). Partitioning enables partition pruning and can decrease I/O costs. This feature is [Generally Available](https://cloud.google.com/products/#product-launch-stages).