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f9488a8cf8 1.2 Approximate Count Distinct The new and optimized SQL function, APPROXCOUNTDISTINCT(), provides approximate count distinct aggregation. However, if a PDB needs to be enabled on a standby database after it was excluded on that standby database, PDB data files need to be copied to the standby database from the primary database and the control file needs to be updated to reflect their paths after which a user needs to connect to the PDB on that standby database and issue ALTER PLUGGABLE DATABASE ENABLE RECOVERY which automatically onlines all of the data files belonging to the PDB. Oracle snapshot technology is used internally to further improve the sharing of homes across clusters and to reduce storage space. SILVER. 1.20 Rapid Home Provisioning Rapid Home Provisioning allows deploying of Oracle homes based on gold images stored in a catalog of pre-created homes. Optimizing the processing time and resource consumption by orders of magnitude while providing almost exact results speeds up any existing processing and enables new levels of analytical insight. The CREATEFILEDEST parameter allows administrators to structure the PDB files independently of the multitenant container database (CDB) file destination.
1.8 In-Memory Column Store In-Memory Column Store enables objects (tables or partitions) to be stored in memory in a columnar format. The columnar format enables scans, joins and aggregates to perform much faster than the traditional on-disk formats for analytical style queries. Oracle Corporation Oracle Database Utilities oracle 11g documentation . The source of the clone must remain read-only while the target needs to be on a file system that supports sparseness. Snapshot cloning support is now extended to other third party vendor systems. Chapter 2. Part I. When not set, the PDB inherits the value from the root container. As compared to alternative SQL execution plans, performance improvements are significant. Reports that require aggregation of data across many regions or other attributes can leverage the CONTAINERS clause and get data from one single place.
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