What is Statspack?

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What is Statspack?

Statspack is a performance tuning tool provided by Oracle with the Oracle9i database distribution. With minimal effort, it can be installed on any Oracle9i database to quickly gather detailed analysis of the performance of that database instance.

How do you read Statspack?

  1. How to read STATSPACK report. General information.
  2. Summary Information. Instance Workload Information.
  3. Instance cache information.
  4. Load profile Information.
  5. Instance Efficiency Ratios.
  6. Top 5 Events section.
  7. Wait Events Information.
  8. Foreground Wait Events.

What is Statspack report?

The Statspack package is a set of SQL, PL/SQL, and SQL*Plus scripts that allow the collection, automation, storage, and viewing of performance data. Statspack stores the performance statistics permanently in Oracle tables, which can later be used for reporting and analysis.

How do I increase my AWR snapshot retention period?

We can change the snap_interval and retention period for the automatic awr snapshot collection, using modify_snapshot_settings function. The default settings for ‘interval’ and ‘retention’ are 60 minutes and 8 days . The values for both ‘interval’ and ‘retention’ are expressed in minutes .

How do I check my Statspack level?

To check your STATSPACK collection level: SELECT * FROM stats$level_description ORDER BY snap_level; Change the STATSPACK collection level to level 5 like this: exec statspack. snap(i_snap_level => 5, i_modify_parameter => ‘true’);

How do you purge Statspack snapshots?

You can delete rows of stats$snapshot table to purge the old data as follows. SQL > delete from stats$snapshot where snap_id < 4000; 1362138 rows deleted.

How do I find my AWR retention?

Default retention is 8 days.

  1. Check the current AWR interval time and retention period. col snap_interval for a20.
  2. Modify retention period to 7 days and interval to 30 min. NOTE : Retention and interval both use value in minutes .
  3. Verify the Changed retention and interval time. SQL> col snap_interval for a20.

How do you set AWR retention?

Steps to Modify AWR Snapshot Interval

  1. STEP 1: Check the Database name and DBID. SQL> select name,dbid from v$database; NAME DBID ——— ———- ORADB 3844563802.
  2. STEP 2: Check the existing snapshot_interval time.
  3. STEP 3: Modify the existing snapshot interval.
  4. STEP 4: Check the modified snapshot interval.

Is AWR available in Standard Edition?

Statspack in Standard Edition vs Oracle AWR Performance problems are mostly solved using Oracle AWR ( Automatic Workload Repository ). But Oracle AWR report is available in the Enterprise edition.

How do you purge Statspack?

How do you drop a stat pack?

how to drop and installing the statspack

  1. select table_name from dba_tables where tablespace_name=’PERFSTAT’;
  2. select object_name,object_type from dba_objects where object_name=’STATSPACK’;
  3. set lines 300.
  4. @?/rdbms/admin/spdrop.sql.
  5. drop tablespace perfstat including contents and datafiles;
  6. Installing statspack:-

How is statspack used to store performance data?

Statspack uses permanent tables owned by the PERFSTATuser to store performance statistics. Rather than creating and dropping tables each time, data is inserted into the existing tables, making it easier to compare historical data. Statspack separates data collection from report generation. Data is collected when a snapshot is taken.

How does the snapshot ID work in statspack?

Statspack users become familiar with the concept of a snapshot, a single collection of performance data. Each snapshot taken is identified by a snapshot ID, which is a unique number generated at the time the snapshot is taken. Each time a new collection is taken, a new SNAP_IDis generated.

What does statspack do in Oracle 8.1.6?

Oracle 8.1.6 introduced statspack as a replacement for the UTLBSTAT/UTLESTAT scripts. Along with additional reporting, statspack can store snapshots of system statistics over time, allowing greater accuracy and flexibility.

Do you have to run statspack report to get elapsed time?

In order to get a meaningful elapsed-time report, you must run a STATSPACK report that compares two snapshots as shown above. It is critical to understand that a report will be invalid if the database is shut down between snapshots.