At the command prompt, type sqlplus and then press the key Enter. At the user name prompt, type your user name and then press the key Enter. At the password prompt, type your password and then press the key Enter. User input is bold. With Oracle Database 11 g Release 2 Either type the full path after the prompt or browse to it, and then press the key Enter.
Near the Password field is the check box Save Password. By default, it is deselected. Oracle recommends accepting the default. The connection is tested. If the connection succeeds, the Status indicator changes from blank to Success. This section shows how to unlock the HR account and connect to Oracle Database as the user HRwho owns the HR sample schema that the examples and tutorials in this document use. To do the tutorials and examples in this document, you must connect to Oracle Database as the user HR.
By default, when the HR schema is installed, the HR account is locked and its password is expired. To unlock the HR account and reset its password:. The HR account is unlocked and its password is password.
Now you can connect to Oracle Database as user HR with the password password. Example shows how to view the names and data types of the objects that belong to the HR schema.
Oracle Database Reference for information about static data dictionary views. If you are not connected to the database, the Connection Information window opens. To the right of each column are its properties—name, data type, and so on. To see all column properties, move the horizontal scroll bar to the right. The Data pane appears, showing a numbered list of all records in this table. To see more records, move the vertical scroll bar down.
To see more columns of the records, move the horizontal scroll bar to the right.
Connecting to Oracle Database
The Constraints pane appears, showing a list of all constraints on this table. To the right of each constraint are its properties—name, type, search condition, and so on. To see all constraint properties, move the horizontal scroll bar to the right. A query nested within another SQL statement is called a subquery.
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In the Worksheet, you can enter a SQL statement. The query disappears, and you can enter another SQL statement in the Worksheet. The query runs. If the Worksheet pane contains a query, clear the query by clicking the icon Clear. Under the Worksheet, the Query Result pane appears, showing the results of the query, which are similar to:.Table lists the supported connection string attributes.
Table Supported Connection String Attributes. Oracle Net Services Name, Connect Descriptor, or an easy connect naming that identifies the database to which to connect.Zelle northwest bank
Number of connections that are closed when an excessive amount of established connections are unused. Enables ODP. NET connection pool to proactively remove connections from the pool when an Oracle RAC service, service member, or node goes down.
NET connection pool to balance work requests across Oracle RAC instances based on the load balancing advisory and service goal. Statement cache enabled and cache size, that is, the maximum number of statements that can be cached. The following example shows a connect descriptor mapped to a TNS alias called sales in the tnsnames.
NET also allows applications to connect without the use of the tnsnames. To do so, the entire connect descriptor can be used as the "data source". The easy connect naming method enables clients to connect to a database without any configuration. With this enabled, ODP. NET allows applications to specify the "Data Source" attribute in the form of:. NET connection pooling is enabled and disabled using the Pooling connection string attribute. By default, connection pooling is enabled.
The following are ConnectionString attributes that control the behavior of the connection pooling service:. Connection Pooling Example. The following example opens a connection using ConnectionString attributes related to connection pooling.
When connection pooling is enabled the defaultthe Open and Close methods of the OracleConnection object implicitly use the connection pooling service, which is responsible for pooling and returning connections to the application. The connection pooling service creates connection pools by using the ConnectionString property as a signature, to uniquely identify a pool. If there is no existing pool with the exact attribute values as the ConnectionString property, the connection pooling service creates a new connection pool.
If a pool already exists with the requested signature, a connection is returned to the application from that pool. When a connection pool is created, the connection pooling service initially creates the number of connections defined by the Min Pool Size attribute of the ConnectionString property.
This number of connections is always maintained by the connection pooling service for the connection pool. The Incr Pool Size attribute of the ConnectionString property defines the number of new connections to be created by the connection pooling service when more connections are needed in the connection pool. When the application closes a connection, the connection pooling service determines whether or not the connection lifetime has exceeded the value of the Connection Lifetime attribute.
If so, the connection pooling service closes the connection; otherwise, the connection goes back to the connection pool. The connection pooling service enforces the Connection Lifetime only when a connection is going back to the connection pool. The Max Pool Size attribute of the ConnectionString property sets the maximum number of connections for a connection pool.This chapter explains how to connect to a database to use Oracle Data Mining.
It contains the following sections:. Be sure to select the appropriate one.
Enter the name of a user ID that has data mining privileges, as described in Chapter 4. You will be prompted to enter the password. The first time you run SQL Developer, you may be prompted to provide the path to the Java executable. For the installation described in Chapter 2the path would be:.
For Connection Namespecify a meaningful name that you will remember. The user must have data mining privileges as described in Chapter 4. For Hostnamespecify localhost to indicate that the database is hosted on the local computer. For Portspecify the port where the database will listen to requests from the client. The default port is This is the first component of the global database name described in the installation instructions in Chapter 2.
Click Connect to connect to the database using the specified credentials. A separate connection to the database is required for each user that will use the tool. Instructions for creating these connections are provided in the Oracle Data Miner Help. To connect to an Oracle Database, a client application must identify the database and present appropriate credentials. The connection mechanism depends on the type of client and whether it is running locally or remotely.
Some connections require the installation of Oracle Client software. There are several methods for specifying login credentials. For example, a client may present login credentials at the time of the connection, as shown below. The system will prompt for a password and establish a connection.
Java Database Connectivity with Oracle
Use the following steps to install Oracle Client on a Windows platform:. Find the service names that start with "Oracle". Choose Stop for each one. Log on to your computer as a member of the Administrator's group. In the Download Software Updates page, provide your My Oracle Support credentials if you want to automatically download software updates. Click Next. See "Install Oracle Database" step 8. This will be the home directory of the Oracle client that you are installing Oracle home. If this directory does not exist, the Installer will create it.
If the directory does exist, make sure that it is empty. Click Install to complete the set up process and begin the installation.
A Net Service Name is not needed.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Is there any hidden table, system variable or something to show active connections in a given moment?
When I'd like to view incoming connections from our application servers to the database I use the following command:. The following gives you list of operating system users sorted by number of connections, which is useful when looking for excessive resource usage. Learn more. Ask Question. Asked 10 years, 10 months ago. Active 2 years, 4 months ago.
Viewed k times. Active Oldest Votes. Yogesh lele 3 3 silver badges 14 14 bronze badges. Either you don't have permissions, or you didn't install the DBA views correctly.
Lott Jun 25 '09 at Yahya Hussein 6, 8 8 gold badges 36 36 silver badges 70 70 bronze badges.How to connect Oracle Database 12c running on Windows Guest VM to Host
Alan Alan 61 1 1 silver badge 1 1 bronze badge. Juber Juber 51 1 1 silver badge 1 1 bronze badge. Welcome to SO! Please provide some intuition for your answers. Tunaki k 27 27 gold badges silver badges bronze badges.To interact with Oracle Database XE, you must typically connect to the database as a database user.
NET Developer Guide. Local and remote connections are explained in the following sections:. To connect locally, you must supply only a database user name and password. For example, Figure shows a user connecting locally with the SQL Command Line and entering a connect command that supplies the user name hr and password hr.
Before making a local connection on Linux, you must set environment variables. See "Setting Environment Variables" for more information. The remote computer must have Oracle client software installed. It is through Oracle client software that Oracle command-line utilities and your applications connect to the database. Oracle Database XE accepts connections from all of the following types of Oracle clien t software:. You can install Oracle Database XE separately on remote computers.
It is available at. All Oracle client software includes Oracle Net, which is the Oracle network software that enables client applications on one computer to connect to databases on another computer over a network. To connect remotely, you must supply not just a user name and password, but a complete Oracle Net conne ct string.
In addition to the database user name and password, a connect string includes a host name or host IP address, an optional TCP port number, and an optional database service name. These additional parameters are required to help Oracle Net find the right host computer and connect to Oracle Database XE. An Oracle Net connect string has the following format:.
If not specified, the default port number is assumed. For example, Figure shows a user connecting remotely with the SQL Command Line and entering a connect command that includes a connect string that supplies: the user name hrthe password hrand the host name dbhost. This connect string connects to the default database service XE on the default port Before making a remote connection from Linux, you must set environment variables. This section explains how to set these environment variables, and contains the following topics:.
On the Win dows platform, environment variables are stored in the Windows registry, and are automatically set for you. You need not take any action involving environment variables before initiating a database connection.
On the Linux platform, before running the SQL Command Line or other Oracle utilities from a terminal session, you must set some environment variables for that session. The procedure for setting environment variables depends on whether you are connecting locally, or connecting remotely from Oracle Database XE. To set environment variables when connecting locally, enter one of the following commands in a terminal session.
To set environment variables when connecting remotely from Oracle Database XE, enter one of the following commands in a terminal session at the remote computer:. Linux only If the required environment variables are not already set for your session, set them as described in "Setting Environment Variables on the Linux Platform". See "About Remote Connections" for a description and examples of connect strings.A database connection is a SQL Developer object that specifies the necessary information for connecting to a specific database as a specific user of that database.
You must have at least one database connection existing, created, or imported to use SQL Developer. In the Connection Name field, enter the name to use for this database connection. In the Username field, enter the name of the user for whom this database connection is being created.Esp light on audi a3
When you choose a connection type, the fields below will change to be appropriate for the selected connection type. This example describes the fields for the Basic connection type.The giver quotes about rules
In the Hostname field, enter the name of the host where the database is located. In the Service name field, enter the service name for the pluggable database PDBincluding the domain name when the database connection is for a PDB user :. Oracle SQL Developer User's Guide for more information about creating, editing, exporting, and importing database connections. Oracle Database Concepts for an overview of the multitenant architecture introduced in Oracle Database 12 cwhich enables an Oracle database to function as a multitenant container database CDB that includes zero, one, or many customer created pluggable databases PDBs.
In the Password field, enter the password for the user. In the Connection Type field, select the database connection type. In the Port field, enter the port for the database.This is another type of Oracle connection string that doesn't rely on you to have a DSN for the connection. You create a connection string based on the format used in the tnsnames. Some reported problems with the one above and Visual Studio. Use the next one if you've encountered problems. The connection pooling service will create a new pool if it can't find any existing pool that exactly match the new connections connection string properties.
If there is a matching pool a connection will be recycled from that pool. The first connection opened creates the connection pool.Underfell beta
The service initially creates the number of connections defined by the Min Pool Size parameter. The Incr Pool Size attribute defines the number of new connections to be created by the connection pooling service when more connections are needed. When a connection is closed, the connection pooling service determines whether the connection lifetime has exceeded the value of the Connection Lifetime attribute.
If so, the connection is closed; otherwise, the connection goes back to the connection pool. The connection pooling service closes unused connections every 3 minutes.
The Decr Pool Size attribute specifies the maximum number of connections that can be closed every 3 minutes. First open a connection with a connection string. When the connection is opened, an error is raised because the password have expired. Catch the error and execute the OpenWithNewPassword command supplying the new password. Article: "Oracle Data Provider for. NET" by Rama Mohan. The easy connect naming method enables clients to connect to a database without any configuration.
By default, connection pooling is enabled. This one controls the pooling mechanisms. The connection pooling service creates connection pools by using the ConnectionString property to uniquely identify a pool. The Max Pool Size attribute sets the maximum number of connections for the connection pool. If a new connection is requested, but no connections are available and the limit for Max Pool Size has been reached the connection pooling service waits for the time defined by the Connection Timeout attribute.
If the Connection Timeout time has been reached, and there are still no connections available in the pool, the connection pooling service raises an exception indicating that the request has timed-out. Oracle can open a connection using Windows user login credentials to authenticate database users. Specifies the type of caching used by the provider to store rowset data. Memory is the default value. All the rowset data is stored in-memory which provides better performance at the expense of higher memory utilization.
This caching mechanism limits the memory consumption at the expense of performance. The FetchSize value must be set appropriately depending on the data size and the response time of the network.
If the value is set too high, this could result in more wait time during the execution of the query. If the value is set too low, this could result in many more round trips to the database.
Valid values are 1 toThe default is Providing a high value for this attribute improves performance, but requires more memory to store the data in the rowset.
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