Create list_snapshots.sql

Author: uschwinn

data-platform/core-converged-db/sql-tuning-sets/scripts-for-sts/list_snapshots.sql

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+REM script: list_snapshots.sql
+REM use DBA_HIST_SNAPSHOTS
+
+-- format the timestamp output
+ALTER SESSION SET NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH:MI';
+
+-- list the snap ids
+
+col begin_snap format a20
+col end_snap format a20
+
+select snap_id, begin_interval_time begin_snap, end_interval_time end_snap
+from dba_hist_snapshot
+order BY snap_id;