Oracle Tidbits – September 2018 #oratidbit

Oracle *daily* TidBits” (#oratidbit) published on  FacebookTwitter, and Google+ during weekdays in September 2018. Hope you find these helpful to learn something new or to remind you of its existence and use.

#oratidbit #license SQL Plan Management in Standard Edition- Only one SQL plan baseline per SQL statement is allowed and SQL plan evolution is disabled.
#oratidbit #license Oracle Sharding – no limit on the number of either primary shards or standby shards if every shard has an Oracle Active Data Guard, Golden Gate, or Oracle RAC license. Without these, use is limited to three primary shards.
#oratidbit #license Tablespace encryption is not available on Standard Edition (SE2) on-prem, but is included in the DBCS-SE (Oracle Database Cloud Service Standard Edition) offering.
#oratidbit Oracle Personal Edition includes all of the components that are included with Enterprise Edition, as well as all Oracle Database options except Oracle RAC. Oracle management packs cannot be used with Personal Edition.
#oratidbit You can enable or disable a CBO related bug fix using the _FIX_CONTROL parameter – gives granular control over specific features and bug fixes. Use V$SYSTEM_FIX_CONTROL to see what bug fix is implemented and detail.
#oratidbit The CDB_* views can be queried only by users with the SYSDBA system privilege or SELECT ANY DICTIONARY privilege, or SELECT_CATALOG_ROLE role, or by users with direct privileges granted to them.
#oratidbit CDB_* views include these hidden columns: CON$NAME: the name of the container whose data a given CDB_* row represents. CDB$NAME: the name of the CDB whose data a given CDB_* row represents.
#oratidbit The AWR_ROOT_* views show the AWR data stored only on a CDB root. In general, the AWR_ROOT views are equivalent to the DBA_HIST views.
#oratidbit A connection storm is a race condition in which application servers initiate an increasing number of connection requests, but the database server CPU is unable to schedule them immediately, which causes the application servers to create more connections.
#oratidbit Database Resident Connection Pool (DRCP) provides a connection pool in the database server for typical web application usage scenarios where the application acquires a database connection, works on the database for a relatively short time, and then releases the connection.
#oratidbit Database Resident Connection Pool (DRCP) is installed by default, but the DBA must start, and configure it using the DBMS_CONNECTION_POOL package.
#oratidbit When Database Resident Connection Pool (DRCP) is configured in a database in an Oracle RAC environment, the pool configuration is applied to each database instance. Starting or stopping the pool on one instance starts or stops the pool on all instances.
#oratidbit The Memoptimize Pool optimizes the read operation for select statements. Memoptimize Rowstore performs high-performance reads for tables specified with the MEMOPTIMIZE FOR READ clause.
#oratidbit DBCA (Database Configuartion Assistant) enables you to create and duplicate CDBs, and create, clone, plug in, and unplug PDBs.
#oratidbit #OEM13c You can upgrade only 13c Release 2 (, 13c Release 1 (, or 12c Release 5 ( directly to 13c Release 3 (
#oratidbit Oracle Data Mining supports both supervised and unsupervised data mining. The DBMS_DATA_MINING package is the application programming interface for creating, evaluating, and querying data mining models.
#oratidbit A transformation is a SQL expression that modifies the data in one or more columns. The DBMS_DATA_MINING_TRANSFORM package implements a set of transformations that are commonly used in data mining.
#oratidbit Oracle R Enterprise is a component of the Oracle Advanced Analytics Option of Oracle Database Enterprise Edition. Oracle R Enterprise is comprehensive, database-centric environment for end-to-end analytical processes in R.