More Information Database Setup You need access to a database if you want to run the examples in this lesson. You can install a database on your machine or perhaps you have access to a database at work.
Restricting Access to an Open Database Mounting a Database to an Instance When you need to perform specific administrative operations, the database must be started and mounted to an instance, but closed.
You can achieve this scenario by starting the instance and mounting the database. Opening a Database in Read-Only Mode Opening a database in read-only mode enables you to query an open database while eliminating any potential for online data content changes.
While opening a database in read-only mode guarantees that datafile and redo log files are not written to, it does not restrict database recovery or operations that change the state of the database without generating redo.
For example, you can take datafiles offline or bring them online since these operations do not affect data content.
If a query against a database in read-only mode uses temporary tablespace, for example to do disk sorts, then the issuer of the query must have a locally managed tablespace assigned as the default temporary tablespace. Otherwise, the query will fail. The following statement opens a database in read-only mode: After placing an instance in restricted mode, you should consider killing all current user sessions before performing any administrative tasks.Like SQL Server, Oracle is an enterprise ready database.
Options for extracting to CSV using Oracle include using Oracle SQL Developer (a free tool from Oracle) and directly using PL/SQL (generally by creating a stored procedure as it is a bit more code based than the other database solutions).
In the meantime, here is a short explanation about how to connect from Spark SQL to Oracle Database. Update: here is the long slides presentation I made for Oracle Week it should cover most of the information new comers need to know about spark.
Oct 12, · Open Standby in Read-write Mode When Primary is Lost In this scenario's we have to open the standby database in read-write mode. Below are the steps to convert standby database to Primary database.
DB File Sequential Read wait event occurs when we are trying to access data using index and oracle is waiting for the read of. Required to register through LDAP using JDBC connection parameters as this requires the ability to write access to the connection factory entries in the LDAP server (which requires the LDAP user to be either the database itself or be granted GLOBAL_AQ_USER_ROLE).
Read Oracle's comments, in red with respect to RESOURCE. They apply here too.
Amazon RDS Read Replicas provide enhanced performance and durability for database (DB) instances. This feature makes it easy to elastically scale out beyond the capacity constraints of a single DB instance for read-heavy database workloads.
Nov 06, · Re: Read/write access to database DrClap Nov 5, PM (in response to ) Look in the DB2 documentation for information about "locks".