A management device (100) includes a storage unit and a ledger deletion unit (150). Information indicating a ledger-deleting condition is recorded in the storage unit, the ledger-deleting condition being a condition for deleting a deletion distributed ledger which is a distributed ledger to record distributed electronic data. The ledger deletion unit (150) deletes the deletion distributed ledger if the ledger-deleting condition is satisfied.

A data synchronization method and device for databases, and a storage medium are disclosed. The method includes: in the case where transaction response results fed back by multiple data nodes are all successful, receiving transaction commit request messages sent by a client, and writing a global transaction ID into a transaction processing list; sending the transaction commit request messages to the multiple data nodes; receiving transaction commit results fed back by the multiple data nodes; and in the case where the transaction commit results fed back by the multiple data nodes are all successful, applying to a global transaction manager to release the global transaction ID.

The disclosed embodiments disclose techniques for journaling data received in a cloud-based distributed computing environment (CBDCE). Multiple services simultaneously execute on the CBDCE compute nodes, with each service comprising multiple service instances that simultaneously execute on multiple, distinct compute nodes of the CBDCE. The CBDCE includes a distributed database that enables coordination between the service instances of services that execute in the CBDCE; this distributed database also includes multiple distributed database instances that simultaneously executing on multiple different CBDCE compute nodes. During operation, a service instance executing on one of these compute nodes receives a client request. The service instance submits this client request to a distributed database instance and, in parallel, also submits the client request and its associated user data to a distributed journaling service.

Techniques for implementing an integrated testing tool for data replication are disclosed. In some embodiments, a software tool performs operations comprising: causing a first set of user interface elements to be displayed on a computing device; receiving, via the first set of user interface elements, a data replication configuration identifying an adapter, a source database, and a target database; storing the data replication configuration in an embedded database; causing a second set of user interface elements to be displayed on the computing device; receiving, via the second set of user interface elements, a data generation configuration identifying a table in the source database; generating random data in the table based on the data generation configuration; instructing the adapter to replicate the source data from the source database onto the target database based on the data replication configuration; and causing a log of events to be displayed on the computing device.

A system that provides for the accessing and playing of media files having differing associated rights such as non-DRM media files, purchased and downloaded media files, subscription download files such as tethered downloads, and subscription streamed DRM files. The system also provides a method and user interface for sharing a media collection among computing devices in communication via a network. The system allows access and playback, from each computing device on a network, of all media files in a media collection, regardless of their associated rights.

Example techniques relate to cloud queue tombstones. An example implementation may involve a computing system receiving instructions to remove a particular media item from a playback queue. Based on the instructions, the computing system removes the particular media item from the playback queue and adds, to the playback queue, a tombstone indicator indicating that the particular media item has been removed from the playback queue. The computing system receives, from the media playback system, a request for a window of one or more media items from the playback queue. Based on the request, the computing system sends, to the media playback system, data representing a particular window of media items from the playback queue, wherein the particular window includes the tombstone indicator. The computing system detects a given tombstone removal trigger from among multiple tombstone removal triggers and based on the detecting, removes the tombstone indicator from the playback queue.

A computing system may include an upgrade access engine configured to access a database upgrade to perform for a production database. The computing system may also include a database upgrade engine configured to generate multiple clones of the production database, including a production clone and a delta clone with instance data removed. The database upgrade engine may perform the database upgrade on the production clone, track changes to the production database, and push the tracked changes to the delta clone. After the database upgrade on the production clone completes, the database upgrade engine may perform the database upgrade on the delta clone, push upgraded data of the delta clone to the upgraded production clone, and set the upgraded production clone as an upgraded version of the production database.

A method includes executing, by a computing device, a reorganization command within an environment; monitoring, by the computing device, unprocessed replication transactions within the environment; determining, by the computing device, whether the unprocessed replication transactions exceed a threshold; and pausing, by the computing device, the executing the reorganization command in response to determining the unprocessed replication transactions exceed the threshold.

Techniques are provided for copying data from a source database to a target database in a database replication system which includes a database event mining system, an event interceptor process and an event receptor process. In one aspect, the event interceptor detects a failure in the event receptor and switches to a mode in which it rejects new database events from the database event mining system. The event interceptor can also request that the database event mining system resend the event after a specified delay. The event interceptor can also shut itself down for a specified period of time, then restart and listen for a pairing request from the event receptor. In another aspect, the event receptor can request that the database event mining system send event data from a specified system change number.

A distributed database processing system for a database composed of data records organized into tables which processes unique index atoms consistently and concurrently. Each attempt to insert a new key value into such a unique index atom in any given node is routed to a unique index atom chairman for processing. The chairman determines whether the request will be granted. If the request is not granted, the requesting unique index atom continues to try to submit the insert. If the request is granted, the requesting unique index atom modifies the content thereof and broadcasts a replicated given unique index atom all other nodes that contain the replicated unique index atom.