实用的数据库检查程序(2)

答案：
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prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt + 3.0 Log Switch In the Last Day                                         +

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt

 

TTitle left "*** Database: "xdbname", How Offen the Log Switch(As of : "xdate" ) ***" skip 1

 

column archive_name format A40

column "Time" format A25

 

select to_char(TO_DATE(Time,'MM/DD/RR HH24:MI:SS'),'DD-MON-RRRR HH24:MI:SS') "Time",

     ARCHIVE_NAME

from v$log_history

where TO_DATE(Time,'MM/DD/RR HH24:MI:SS') > sysdate - 1

order by TO_DATE(Time,'MM/DD/RR HH24:MI:SS') desc ;

 

prompt

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt 3.0 Invesigation

prompt Standard:

prompt During periods of high activity , log switches are occurring every 20 minutes

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt

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prompt

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt + 3.1 Log Buffer  - redo log space requests : The Value                  +

prompt + should be relative small prompt Server is waiting for                  +

prompt + disk space to be allocate for redo log entries                         +

prompt + Space is created by performing a log switch                            +

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt

 

ttitle left "*** Log Buffers - redo log space requests ***" Skip 1

select substr(name,1,25) "Log Buffers",

    substr(value,1,15) "VALUE (Near 0?)"

from v$sysstat

where name = 'redo log space requests'

/

 

prompt

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt 3.1 Investigation

prompt If the value is not near 0 , increase LOG BUFFER.

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt

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prompt

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt + 3.2 Log Buffer - log buffer space                                      +

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt

ttitle left "*** Log Buffers - Log Buffer Space Waits***" Skip 1

select sid , event , seconds_in_wait , state

from v$session_wait

where event = 'log buffer space'

/

 

prompt

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt 3.2 Invesigation

prompt There should be no log buffer space waits

prompt Making the log buffer bigger if it is small

prompt Moving the log files to faster disks such as striped disks

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt

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prompt

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt + 3.3 Log Buffer - Redo Buffer Allocation Retries                        +

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt

 

ttitle left "*** Log Buffers - Redo Buffer Allocation Retries ***" Skip 1

column name print

select name , value

from v$sysstat

where name in ('redo buffer allocation retries','redo entries')

/

 

prompt

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt 3.3 Investigation

prompt Redo Buffer Allocation Retries should be near 0

prompt the number should be less than 1% of Redo Entries

prompt Increase the size of the redo log buffer (LOG BUFFER)

prompt improve the checkpointing or archiving process

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt

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prompt

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt + 3.4 Log Buffer - Log File Switch Completion                            +

prompt + Identify the log file switch waits because of log switches             +

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt

 

ttitle left "*** Log Buffers - Log File Swith Completion***" Skip 1

select event , total_waits,time_waited,average_wait

from v$system_event

where event like 'log file switch completion%'

/

prompt

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt 3.4 Investigation

prompt Increase the size of the redo log files

prompt <<<<<<<<<<<<<<<<<<< NOTE: >>>>>>>>>>>>>>>>>>>>>>

prompt

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prompt

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt + 3.5 Log Buffer - CHECKPOINT Incomplete                                 +

prompt ++++++++++++++++++++++++++++++++++ Item ++++++++++++++++++++++++++++++++++

prompt

 

ttitle left "*** Log Buffers - CheckPoint

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