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The glogin.sql file applies to all the users of the system, and therefore it is called a site profile. If you want all SQL*Plus sessions to have a specific set of environment variable values upon logging in, all you have to do is edit the glogin.sql file. Only DBAs, not individual users, can access the glogin.sql file.

The site profile is created during installation, and the file is placed in the $ORACLE_HOME/sqlplus/ admin directory. Listing 4-4 shows the default glogin.sql file, which is read by Oracle every time you log into SQL*Plus. You can add various settings to the glogin.sql file to suit your needs. In previous versions of the Oracle database, the glogin.sql file contained various formatting commands for the SQL*Plus interface that automatically configured environmental variables for any user who logged into SQL*Plus. The database would run the glogin.sql file first when you logged into SQL*Plus, followed by the running of the login.sql file. In Oracle Database 11g, the glogin.sql site profile file is invoked automatically as before, when you log into SQL*Plus. However, the file is blank now, as shown in Listing 4-4. Listing 4-4. The Default glogin.sql File -------------Copyright (c) 1988, 2005, Oracle. All Rights Reserved. NAME glogin.sql DESCRIPTION SQL*Plus global login "site profile" file Add any SQL*Plus commands here that are to be executed when a user starts SQL*Plus, or uses the SQL*Plus CONNECT command. USAGE This script is automatically run

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Usually when people talk about a database hang, they re mistaking a severe performance problem for a database hang. This is normally the case when there s severe contention for internal kernel-level resources such as latches and pins. You can use the following query to find out what the contention might be: SQL> SELECT event, count(*) 2 from v$session_wait 3 group by event;

EVENT ---------------------------PL/SQL lock timer Queue Monitor Wait SQL*Net message from client SQL*Net message to client jobq slave wait pmon timer rdbms ipc message smon timer wakeup time manager 9 rows selected. SQL>

Fetch Size (Level Inherited From)

COUNT(*) -------2 1 61 1 1 1 11 1 1

that the NTP management tools are inextricably coupled with the computing platforms on which the service runs, the level of the overall network management that s already in place, and the optional features you ve configured With a single dedicated timeserver, you will rely on the device management software that s supplied by the vendor with that timeserver Additionally, the timeserver could be integrated via SNMP into an overall network management scheme that you may already have in place With a Unix stratum 2 server serving time to your network clients and itself relying on public stratum 1 servers, you will first and foremost want to ensure that the public servers continue to be available A periodic automated ping (not every ten seconds but maybe once or twice a day), with an alert e-mail if the ping fails, might be in order.

The previous query doesn t reveal any significant contention for resources all the waits are for idle events. If your database is performing an extremely high number of updates, contention for resources such as undo segments and latches could potentially be a major source of database-wide slowdowns, making it seem sometimes like the database is hanging. In the early part of this chapter, you learned how to analyze database contention and wait issues using the V$SESSION_WAIT view and the AWR output. On Windows servers, you can use the Performance Monitor and Event Monitor to locate possible high resource usage. Check for excessive library cache contention if you re confronted by a database-wide slowdown.

If a major table or tables are locked unbeknownst to you, the database could slow down dramatically in short order. Try running a command such as SELECT * FROM persons, for example, where persons is your largest table and is part of just about every SQL statement. If you aren t sure which tables (if any) might be locked, you can run the following statement to identify the table or index that s being locked, leading to a slow database: SQL> 2 3 4 5 6* SELECT l.object_id, l.session_id, l.oracle_username, l.locked_mode, o.object_name FROM V$LOCKED_OBJECT l, DBA_OBJECTS o WHERE o.object_id=l.object_id; SESSION_ID ---------22 ORACLE_USERNAME --------------NICHOLAS LOCKED_MODE ----------6 OBJECT_NAME ----------EMPLOYEES

20 (PreparedStatement) 50 (ResultSet) 50 (PreparedStatement)

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