Abstract: The subject technology generates, by a compute service manager, a schema hash value for a new schema version associated with a new schema version value, the schema hash value based on determining a sum of hash values of a set of attributes of value columns, the set of attributes comprises a column identifier, and a logical type of a column. The subject technology stores a mapping of the schema hash value to the new schema version value for a table in a metadata database. The subject technology stores a new schema entry based on the schema hash value, the new schema version value, and a new column for the table in the metadata database, the metadata database storing multiple entries for different schema versions, each entry including a particular schema hash value for mapping to a corresponding schema version from the different schema versions.

Abstract: The subject technology receives a statement to perform an operation to add a new column into a table. The subject technology generates a schema hash value for a new schema version associated with a new schema version value. The subject technology stores a mapping of the schema hash value to the new schema version value for the table in a metadata database. The subject technology stores a new schema entry based on the schema hash value, the new schema version value, and the new column for the table in the metadata database. The subject technology performs an operation to add the new column to the table.

Abstract: Techniques to track resource usage statistics per transaction across multiple layers of protocols and across multiple threads, processes and/or devices are disclosed. In one embodiment, for example, a technique may comprise assigning an activity context to a request at the beginning of a first stage, where the activity context has an initial set of properties. The values of the properties may be assigned to the properties in the initial set during the first stage. The value of a property may be stored on a data store local to the first stage. The activity context may be transferred to a second stage when the request begins the second stage. The transferred activity context may include a property from the initial set of properties. The stored values may be analyzed to determine a resource usage statistic. Other embodiments are described and claimed.

Abstract: Techniques to track resource usage statistics per transaction across multiple layers of protocols and across multiple threads, processes and/or devices are disclosed. In one embodiment, for example, a technique may comprise assigning an activity context to a request at the beginning of a first stage, where the activity context has an initial set of properties. The values of the properties may be assigned to the properties in the initial set during the first stage. The value of a property may be stored on a data store local to the first stage. The activity context may be transferred to a second stage when the request begins the second stage. The transferred activity context may include a property from the initial set of properties. The stored values may be analyzed to determine a resource usage statistic. Other embodiments are described and claimed.

Abstract: Techniques to track resource usage statistics per transaction across multiple layers of protocols and across multiple threads, processes and/or devices are disclosed. In one embodiment, for example, a technique may comprise assigning an activity context to a request at the beginning of a first stage, where the activity context has an initial set of properties. The values of the properties may be assigned to the properties in the initial set during the first stage. The value of a property may be stored on a data store local to the first stage. The activity context may be transferred to a second stage when the request begins the second stage. The transferred activity context may include a property from the initial set of properties. The stored values may be analyzed to determine a resource usage statistic. Other embodiments are described and claimed.

Abstract: Techniques to track resource usage statistics per transaction across multiple layers of protocols and across multiple threads, processes and/or devices are disclosed. In one embodiment, for example, a technique may comprise assigning an activity context to a request at the beginning of a first stage, where the activity context has an initial set of properties. The values of the properties may be assigned to the properties in the initial set during the first stage. The value of a property may be stored on a data store local to the first stage. The activity context may be transferred to a second stage when the request begins the second stage. The transferred activity context may include a property from the initial set of properties. The stored values may be analyzed to determine a resource usage statistic. Other embodiments are described and claimed.