Identifying PostgreSQL Bloat and fixing it without downtime
MVCC (Multi-Version Concurrency Control) feature allows databases to provide concurrent access to data. This allows each SQL statement to see a snapshot of data as it was some time ago,…
12c:Specifying lock timeout for finish_redef_table
Oracle 12c database has introduced enhancement to DBMS_REDEFINITION for specifying a a lock timeout (in seconds) which will allow FINISH_REDEF_TABLE to acquire an exclusive lock for swapping the source and interim tables.If…