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How to Alter Log

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hello everyone welcome back to oracle database administration workshop so today we will go over a quick demonstration on how to see the archive log mode and how to check the alert log file and how to see all the database control file trace files and all those things right so i have logged into my uh server here i can see my orc database is up and running here i will connect to my database using sql plus ssdba and then you have to do show parameter uh dump show parameter dump the moment you do you will see this dump dash right so you have to go to this particular location in order to check the alert log right you can go here i already logged in here if you do pwd it will get you this cdm directory you just go one step below below that that is oracle user on app oracle dag rdbms or cl or cl you can see oracle then you need to go inside trace there you will see all your trace files you know all your alert log you can see alert or cl dot log this is the one important file uh you know whic

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What does alter system switch Logfile do?

The SWITCH LOGFILE clause lets you explicitly force Oracle Database to begin writing to a new redo log file group, regardless of whether the files in the current redo log file group are full.

What is a log switch what happens when it occurs?

A log switch occurs when LGWR stops writing to one redo log group and starts writing to another. By default, a log switch occurs automatically when the current redo log file group fills. You can force a log switch to make the currently active group inactive and available for redo log maintenance operations.

What does alter system checkpoint do?

The SQL statement ALTER SYSTEM CHECKPOINT explicitly forces Oracle to perform a checkpoint for either the current instance or all instances. Forcing a checkpoint ensures that all changes to the database buffers are written to the datafiles on disk. The GLOBAL option of ALTER SYSTEM CHECKPOINT is the default.

How do I find my alert log?

The Oracle Alert Log can be found inside the database Automatic Diagnostics Repository (ADR), which is a hierarchical file-based repository for diagnostic information: $ADRBASE/diag/rdbms/{DB-name}/{SID}/trace .

What is the difference between alter system switch logfile and archive log current?

RAC: If you are running RAC, the ALTER SYSTEM ARCHIVE LOG CURRENTwill switch the logs on all RAC nodes (instances), whereas ALTER SYSTEM SWITCH LOGFILE will only switch he logfile on the instance where you issue the switch command. Hence, ALTER SYSTEM ARCHIVE LOG CURRENT is a best practice for RAC systems.

What is alter log archive current?

Argument required: The ALTER SYSTEM ARCHIVE LOG CURRENT allows you to specify the thread to archive while the ALTER SYSTEM SWITCH LOGFILE archives only the current thread. If you do not pass the thread parameter, Oracle will archive all full online redo logs.

What is the command to switch logfile in Oracle?

Oracle has two ways to force a logfile switch. ALTER SYSTEM SWITCH LOGFILE; ALTER SYSTEM ARCHIVE LOG CURRENT; Both will force a log switch log and move to another available redo log file(having status inactive).

What is alter system log files?

Answer: As you noted, the alter system switch logfile command forces a log switch. It will produce an archived redo log that is smaller than the size dictated by the size of the logbuffer parameter, which governs the size of the redo log RAM buffer.

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