How do I make an AWR report for a specific time?
How do I make an AWR report for a specific time?
Generating an AWR Compare Periods Report for the Local Database
- At the SQL prompt, enter: @$ORACLE_HOME/rdbms/admin/awrddrpt.sql.
- Specify whether you want an HTML or a text report: Enter value for report_type: html.
- Specify the number of days for which you want to list snapshot IDs in the first time period.
How do you analyze an AWR report?
Analysis AWR Report
- DB Time(s): Sessions elapsed time in the database.
- DB CPU(s): Sessions elapsed time in the CPU.
- Redo Size: Redo size ( byte ) between two snapshot.
- Logical Reads: Logical read count in the database.
- Block Changes: Block changes count between two snapshot.
How is DB time in AWR report calculated?
If you look at any AWR or Statspack report in the “Time Model” section, you will see DB Time. The DB time value is technically all server process CPU consumption plus the non-idle wait time within the reporting snapshot interval, converted to seconds. (The raw statistic is stored in microseconds.)
What is CPU time in AWR report?
“CPU time” meaning that your statement was used CPU for N seconds “Elapsed Time” mean all time for your statement, because you can spent it for waiting your HDD or locks or something else. It’s all should be in AWR report if you tracing with maximum level.
What is AWR in DB?
Automatic Workload Repository report or AWR report collects, processes, and maintains performance statistics for problem detection and self-tuning purposes. This gathered data is stored both in memory and in the database and is displayed in both reports and views.
What AWR report contains?
The AWR provides a set of tables into which snapshots of system statistics are stored. Generally these snapshots are taken on an hourly basis and include wait interface statistics, top SQL, memory, and I/O information that is cumulative in nature up to the time of the capture.
Which two things should a DBA look for in AWR report?
Look at the Host CPU and Instance CPU sections. The key things to look for are the values “%Idle” in the “Host CPU” section and “%Total CPU” in the “Instance CPU” section. execution plans, especially if accompanied with high (buffer) gets.
What we can see in AWR report?
What is DB wait time?
So What is DB Time? Database Time, or DB Time, is defined by Oracle as the total time by foreground sessions executing database calls. This includes CPU time, IO time, and non-idle wait time. In other words, it’s the total time spent either actively working or actively waiting in a database call.
What is the difference between DB time and elapsed time?
DB Time is the Oracle server process CPU consumption and all non-idle wait time. Elapsed Time (ET) is the sum (i.e., all) DB Time related to a task, such as a SQL_ID. Wall Time is what we hope the user experiences.
What is CPU wait for CPU?
CPU wait is a somewhat broad and nuanced term for the amount of time that a task has to wait to access CPU resources. This term is popularly used in virtualized environments, where multiple virtual machines compete for processor resources.
How do I check my CPU utilization in AWR?
To check that, look at OS CPU usage statistics either directly in the OS (using sar or other utility available on the host OS) or by looking at IDLE/(IDLE+BUSY) from the Operating System statistics section and comparing it to the number above.
