Monitor Segment Group Transfers

you can perform segment group transfers in the {{ocient}} system use the data in the sys segment group transfers system catalog table to monitor this activity segments, segment groups, and segment group transfers a segment is the primary storage unit individual segments combine together to form segment groups for details, see core elements of an ocient system docid\ adp4amtxi3djdrsq2khdb in a system that has multiple storage clusters, the ocient system might experience a data imbalance between clusters in this case, you might need to transfer segment group ownership between clusters transferring segment groups enables you to transfer the physically stored segments between clusters during or after the segment group transfer, you can monitor the activity using the sys segment group transfers system catalog table segment group transfers system catalog table the database contains the system catalog table named sys segment group transfers with these columns id — a uuid that represents the transfer identifier src cluster id — the uuid of the source cluster dst cluster id — the uuid of the destination cluster status — the current status of the transfer active — the transfer is ongoing complete — the transfer is complete and the segment groups are owned by the destination cluster failed — the transfer is not complete and the segment groups are owned by the source cluster a transfer can be in this state due to an error that prevented the system from transferring segment groups or due to a canceled transfer segment group ids — an array of uint64 segment group identifiers src committed osn — the ownership sequence number (osn) where the source cluster no longer returns the segment groups in the transfer for queries dst committed osn — the osn where the destination cluster added the segment groups the destination cluster does not return the segment groups for queries unless the query uses at least the src committed osn value for the osn of the source cluster the database removes segment group transfers from the system upon completion related links system catalog