Category: Oracle Database
Partitioning enables you to decompose very large tables and indexes into smaller and more manageable pieces called partitions. Each partition is an independent object with its own name and optionally its own storage. Now in 11g, Oracle introduced new partition type called INTERVAL PARTITIONING The INTERVAL clause of the CREATE TABLE statement establishes interval partitioning for the table. You must specify at least one range partition using the PARTITION clause. The range partitioning key value determines the high value of the range partitions, which is called the transition point, and the database automatically creates interval partitions for data beyond that...
In the previous release there was no way to control the amount of memory used by an individual PDB. It could use up lots of memory and impact the performance of other PDBs in the same instance. Oracle Database 12c Rel.2 (12.2) allows to control the amount of memory used by a PDB. PDB Memory Parameters The following parameters can be set at the PDB level. DB_CACHE_SIZE : minimum buffer cache size for the PDB. SHARED_POOL_SIZE : minimum shared pool size for the PDB. PGA_AGGREGATE_LIMIT : maximum PGA size for the PDB. PGA_AGGREGATE_TARGET : target PGA size for the PDB....
Oracle introduced the long awaited Database 12c Release 2 earlier this year at OracleOpen World. Oracle just released Oracle Database 12c Release 2 for on-premises Linux and Solaris. Find below an incomplete list of the main new features: 1. Multi-Instance Redo Apply : With Oracle 12c Release 2, you can apply redo logs to multiple instance at the same time to improve recovery time objective. 2. Oracle Database Sharding : With Oracle 12c Release 2, you can horizontally partitioned data across many databases and present them as a single logical database to application. 3. Creating Data Guard Standbys With Database Creation Assistant : You...
The UTL_MAIL database package is used to manage email. It allows you to send an email message directly from the database server, with cc and bcc, and also catering for RAW attachments. This package is not installed by default due to obvious security reasons, but needs to be installed manually via two scripts: utlmain.sql and prvtmail.plb, both of which are in the rdbms/admin directory under the Oracle Home. sqlplus / as sysdba SQL> @?/rdbms/admin/utlmail.sql SQL> @?/rdbms/admin/prvtmail.plb However, in the case of an Oracle 12c Database, it is not enough to run these scripts in the root container. You need to...
Prior to Oracle Database 12c, the password file was always located under $ORACLE_HOME/dbs file structure, even for RAC instances and for RAC ASM cluster. For RAC the DBA had to managed to keep the password file in sync on each node. Now , in Oracle 12c, it is possible to store the password file on ASM. This means a shared password file for Oracle RAC databases , it is shared for all instances in the cluster. The command utility to create the password file is still the same: “orapwd” Oracle 11g file – name of password file (required), password –...
PART 1 LINK Oracle VM 3-4-2 Oracle VM Manager 3.4.2 supports current and previous Oracle VM Server releases. Part 2 You can use Oracle VM Manager 3.4.2 to manage Oracle VM Server Release 3.4.x, 3.3.x, 3.2.10, or 3.2.11. If Oracle VM environment consists of Oracle VM Manager Release 3.4.2 and one or more instances of Oracle VM Server at a different release, you should review the list of supported and unsupported operations and features, as follows: Supported Operations Oracle VM supports most common operations when using Oracle VM Manager to manage an instance of Oracle VM Server that is at...
DB_ULTRA_SAFE is a new parameter introduced in 11g. It provides an integrated mechanism to offer protection from various possible data corruptions. and provides critical high availability benefits for Oracle Database. Setting DB_ULTRA_SAFE initialization parameter will configure the appropriate data protection block checking level in the database. It will control DB_BLOCK_CHECKING, DB_BLOCK_CHECKSUM, and DB_LOST_WRITE_PROTECT. DB_BLOCK_CHECKING controls whether or not Oracle performs block checking for database blocks. DB_BLOCK_CHECKSUM determines whether DBWn and the direct loader will calculate a checksum and store it in the cache header of every data block when writing it to disk. DB_LOST_WRITE_PROTECT enables or disables lost write detection....
The Oracle Database Firewall enables organizations to protect their databases from internal and external attacks. Oracle Database Firewall allows unauthorised SQL traffic on the network to be monitored and blocked before reaching the database. Database Firewall for Security and Compliance Oracle Database Firewall monitors and enforces normal application behavior in order to avoid the increasingly sophisticated Data Centre attacks that can lead to unauthorised external access. The security control of Oracle Database Firewall helps to prevent malicious activity such as SQL injection and application bypass from reaching the database. Next-Generation Network-based Database Security The grammar of the SQL statements being...
The Database Migration Assistant for Unicode (DMU) provides a good solution for migrating databases from legacy character sets to the Unicode character set. It is shipping with Oracle Database 12c Rel.1 and becomes the officially supported method for migration to the Unicode character set. Database Character Set Scanner (CSSCAN) and CSALTER utilities are removed from the database installation and have been desupported. DMU also supports migrating selected prior database releases of 10.2, 11.1 and 11.2. Oracle DMU 2.1, released in May 2015, supports a near-zero downtime migration model in conjunction with the Oracle GoldenGate replication technology. Using DMU2.1 and GoldenGate...
An interesting feature for Oracle 11g is DBMS_COMPARISON package which planned to use compare data within two schemas or between database`s schema. To use DBMS_COMPARISON you have to grant. If you connected as SYSDBA you already have had grant to execute. Other users need execute grants on DBMS_COMPARISON and that user will need to be granted execute catalog role too. Note: The database character sets must be the same for the databases that contain the database objects being compared. For all scan modes to be supported by the DBMS_COMPARISON package, the database objects must have one of the following types...
