Of course, there are some sessions and much more detail in AWR that is not present in Statspack. As I already mentioned, the changes were made based on files gathered from a So, maybe the changes to make may differ in other versions. Please verify and of course save a backup of the files before making any change. Sim, ele ainda funciona no 11g e 12c.
You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. After snapshots are taken, you can run the performance report.
Approximately 64MB is required to install Statspack. The amount of database space required by the Statspack package depends on the frequency of snapshots, the size of the database and instance, and the amount of data collected, which can be configured. It is therefore difficult to provide general storage clauses and space utilization predictions that are accurate at each site.
The default tablespace is used to create all Statspack objects, such as tables and indexes. The temporary tablespace is used for sort-type activities. Oracle9i Database Concepts for more information on temporary tablespaces. SQL install script runs the following scripts automatically:. LIS output files. For example:. The variables are:. SQL is run, it does not prompt for the information provided by the variables. In an Oracle Real Application Clusters environment, you must connect to the instance for which you want to collect data.
Taking such a snapshot stores the current values for the performance statistics in the Statspack tables. This snapshot can be used as a baseline for comparison with another snapshot taken at a later time. Statspack will then include important timing information in the data it collects. Timing data is important and is usually required by Oracle support to diagnose performance problems.
SNAP function. To make performance comparisons from one day, week, or year to the next, you need multiple snapshots taken over a period of time. The best method to gather snapshots is to automate the collection at regular intervals. You have the following options:. SQL , which schedules a snapshot every hour, on the hour. You might want to schedule snapshots at regular times each day to reflect your system's OLTP or batch peak loads.
For example, you could take snapshots at 9 a. SQL script once on each instance in the cluster. After snapshots are taken, you can generate performance reports. The Statspack package includes two reports. It is not correct to specify begin and end snapshots where the begin snapshot and end snapshot were taken from different instance startups.
In other words, the instance must not have been shutdown between the times that the begin and end snapshots were taken. This is necessary because the database's dynamic performance tables, which Statspack queries to gather the data, reside in memory.
Hence, shutting down the database resets the values in the performance tables to 0. Because Statspack subtracts the begin-snapshot statistics from the end-snapshot statistics, the resulting output is invalid. If begin and end snapshots taken between shutdowns are specified in the report, then the report shows an appropriate error to indicate this.
Because data gathering is separate from report production, you have flexibility to base a report on any data points you select. For example, as DBA you might want to use the supplied automation script to automate data collection every hour, on the hour. If, at some later point, a performance issue arose that might be better investigated by looking at a three-hour data window, all you have to do is specify the required start point and end point when running the report.
In an Oracle Real Application Clusters environment, you must connect to the instance on which you want to report.
The blank lines thus identify begin and end snapshots that cannot be used together when running a Statspack report. Example shows the SQL commands to run the report and an example of the partial report output. When you examine the instance report, you often find high-load SQL statements that you want to examine more closely.
SQL , displays statistics, the complete SQL text, and if a level six snapshot has been taken , information on any SQL plan s associated with that statement. The SQL statement to be reported on is identified by a hash value, which is a numerical representation of the statement's SQL text. The hash value for each statement is displayed for each statement in the SQL sections of the instance report.
SQL script. Both the snapshot level and the thresholds specified affect the amount of data Statspack captures. You can change the amount of information gathered by specifying a different snapshot level. The higher the snapshot level, the more data is gathered. The default level set at installation is level 5. For typical usage, level 5 snapshot is effective on most sites. There are certain situations when using a level 6 snapshot is beneficial.
These include the following:. There are other parameters you can configure, in addition to the snapshot level. These parameters are used as thresholds when collecting data on SQL statements; data is captured on any SQL statements that breach the specified thresholds. Please check spcusr.
Make sure there were no errors in the process by accessing the spcpkg. The report generated by Statspack is also only extracted in. This site uses Akismet to reduce spam. Learn how your comment data is processed. What is Oracle Statspack?
How does Oracle Statspack work? Level 5 This level includes capturing high resource usage SQL Statements, along with all data captured by lower levels. Level 7 This level captures segment level statistics, including logical and physical reads, row lock, itl and buffer busy waits, along with all data captured by lower levels. Level 10 This level includes capturing Child Latch statistics, along with all data captured by lower levels.
Commit complete. Synonym created. Please check spctab.
0コメント