Solution : https://service.sap.com/sap/support/notes/875477 (SAP Service marketplace login required)
Key words :
alter tablespace <tablespace_name> begin backup, ensure block-internal consistency, checks block-internal consistency, data file restore times, begin backup runtimes longer, increased begin backup runtime, ckpt process scans, rdbms ipc reply, i-node locking, newer oracle version
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