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18c Database : Oracle Sharding Enhancements

Some important enhancements to Oracle Sharding.

Now Supports CDB with a single PDB attached to it

  • GSDCTL has new commands “add cdb”
  • Supports CDB which has only one CDB

User Defined Sharding methods

  • In previous releases the tablespaces are related to a tablespace set
  • In user defined sharding , we can specify our own tablespaces
  • Then add those tablespaces to shardspace
  • Then add the shards, shard catalog

Consistency Levels for Multi Shard Queries –

  • Initialization Parameter MULTISHARD_QUERY_DATA_CONSISTENCY
  • Strong - SCN synchronization is performed across all shards
  • Shard_local - SCN synchronization is not performed across all shards. Data is consistent within each shard
  • Delayed_standby_allowed - SCN synchronization is not performed across all shards. Data is consistent within each shard. This setting allows data to be fetched from Data Guard standby databases when possible

Thanks

Suresh

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