This topic provides information to help you configure your DB system.
Network Time Protocol
Oracle recommends that you run a Network Time Protocol (NTP) daemon on your 1-node DB systems to keep system clocks stable during rebooting. If you need information about an NTP daemon, see Setting Up “NTP (Network Time Protocol) Server” in RHEL/CentOS 7.
Oracle recommends that you configure NTP on both nodes in a 2-node RAC DB system to synchronize time across the nodes. If you do not configure NTP, then Oracle Clusterware configures and uses the Cluster Time Synchronization Service (CTSS), and the cluster time might be out-of-sync with applications that use NTP for time synchronization.
For information about configuring NTP on a version 12c database, see Setting Network Time Protocol for Cluster Time Synchronization. For a version 11g database, see Network Time Protocol Setting.
Transparent Data Encryption
All user-created tablespaces in a DB system database are encrypted by default, using Transparent Data Encryption (TDE).
- For version 12c databases, if you don’t want your tablespaces encrypted, you can set the
ENCRYPT_NEW_TABLESPACESdatabase initialization parameter to
- On a 1- or 2-node RAC DB system, you can use the dbcli update-tdekey command to update the master encryption key for a database.
- You must create and activate a master encryption key for any PDBs that you create.
After creating or plugging in a new PDB on a 1- or 2-node RAC DB System, use the
dbcli update-tdekeycommand to create and activate a master encryption key for the PDB. Otherwise, you might encounter the error
ORA-28374: typed master key not found in walletwhen attempting to create tablespaces in the PDB. In a multitenant environment, each PDB has its own master encryption key which is stored in a single keystore used by all containers. For more information, see "Overview of Managing a Multitenant Environment" in the Oracle Database Administrator’s Guide.
- For information about encryption on Exadata DB systems, see Using Tablespace Encryption in Exadata Cloud Service.
For detailed information about database encryption, see the Oracle Database Security White Papers.