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Monitoring the Redo Logs
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You can use two key dynamic views, V$LOG and V$LOGFILE, to monitor the online redo logs. The V$LOGFILE view provides the full filename of the redo logs, their status, and type, as shown here: SQL> SELECT * FROM V$LOGFILE; GROUP # STATUS TYPE --------------- -----3 STALE ONLINE 2 ONLINE 1 ONLINE 3 rows selected. MEMBER -------------------------------------/u10/app/oracle/oradata/nina/log01.rdo /u10/app/oracle/oradata/nina/log01.rdo /u10/app/oracle/oradata/nina/log01.rdo
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CH A PT ER 1 8 M ANA GIN G AN D MON IT O RING TH E O PERA TI ON AL D AT AB ASE
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The V$LOG view gives detailed information about the size and status of the redo logs, as well as showing whether the logs have been archived: SQL> SELECT group#, sequence#, bytes, archived, members, status 2* FROM V$LOG; GROUP# SEQUENCE# BYTES ARCHIVED MEMBERS STATUS ---------- ---------- ---------- --- ---------- ------------1 8 104857600 NO 1 INACTIVE 2 10 104857600 NO 1 CURRENT 3 7 104857600 NO 1 INACTIVE 4 9 10485760 NO 3 INACTIVE SQL>
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Managing Database Links
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A database link enables a one-way connection to a remote database from a local database. The link is one-way only. The remote database users can t use this link to connect to the local database they must create a separate database link for that. A database link allows you to gain access to a different database though a remote database user account; you don t have to be a user in the remote database. Your privileges on that database will be identical to the privileges of the user account you use when creating the database link. Database links are useful when you want to query a table in a distributed database or even insert data from another database s table into a local table. Database links allow users to access multiple databases as a single logical database. You can create private and public database links. In the following sections, we ll look at examples of how to create both types of database links.
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Creating a Private Database Link
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A private database link is owned by the user that creates the link. In the following statement, the SYSTEM user creates a private database link. The database link enables a connection to the remote database using the hr user s username and password in that database. SQL> CONNECT system/system_passwd@finance Connected. SQL> SQL> CREATE DATABASE LINK MONITOR 2 CONNECT TO hr IDENTIFIED BY hr 3 USING 'monitor'; Database link created. SQL> After the link is created, the SYSTEM user can query the hr.employees table in the remote database. SQL> SELECT COUNT(*) FROM hr.employees@monitor; COUNT(*) ---------107 SQL>
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CHAPTER 18 MA NA GING AND M ONITORING THE OPERATIONA L DATABA SE
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To create a database link, a user must have the CREATE PRIVATE DATABASE LINK privilege or the CREATE PUBLIC DATABASE LINK privilege in the local database.
In the preceding statement, note that the database link s name is MONITOR, which is the same as the remote database s TNS name alias (Oracle Net Service alias), but it could be anything you want. The CONNECT TO . . . IDENTIFIED BY clause means that the user of this database link will use that username and password to enter the remote database. The USING 'monitor' clause simply specifies the TNS name alias for the linked remote database. Because this is a private database link, only the SYSTEM user can use it. When the hr user tries to use this link to a remote database, this is what happens: SQL> CONNECT hr/hr; Connected. SQL> SELECT count(*) FROM hr.employees@monitor; select count(*) from hr.employees@monitor * ERROR at line 1: ORA-02019: connection description for remote database not found SQL>
Creating a Public Database Link
A public database link, unlike a private database link, enables any user or any PL/SQL program unit to access the remote database objects. The creation statement is very similar to that for a private database link. You just add the PUBLIC keyword to the CREATE DATABASE LINK statement: SQL> connect system/system_passwd as sysdba; Connected. SQL> CREATE PUBLIC DATABASE LINK MONITOR 2 CONNECT TO hr IDENTIFIED BY hr 3 USING 'monitor'; Database link created. SQL>
Tip You can create a public database link if several users require access to a remote Oracle database from a local database. Otherwise, create a private database link, which will allow only the owner of the private database link to access database objects in the remote database.
Once the public MONITOR link is created, any user can log into a remote database using that link. In the following example, the user tester uses the public database link to query the remote database, MONITOR. SQL> CONNECT tester/tester1; Connected. SQL> SELECT COUNT(*) FROM hr.employees@monitor; COUNT(*) ---------107 SQL>
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