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Listing 18-10. The Top User Events Part of the ASH Report (Jun 28 12:29 to 13:30) Avg Active Event Event Class % Activity Sessions ----------------------------------- --------------- ---------- ---------null event Other 19.75 0.00 CPU + Wait for CPU CPU 18.52 0.00 SQL*Net break/reset to client Application 18.52 0.00 log file switch completion Configuration 1.23 0.00 log file sync Commit 1.23 0.00 ------------------------------------------------------------The Top Background Events section, shown in Listing 18-11, shows the wait events in the database. Listing 18-11. The Top Background Events Part of the ASH Report Top Background Events (Jun 28 12:29 to 13:30) Avg Active Event Event Class % Activity Sessions ----------------------------------- --------------- ---------- ---------os thread startup Concurrency 20.99 0.00 control file parallel write System I/O 9.88 0.00 CPU + Wait for CPU CPU 6.17 0.00 db file sequential read User I/O 1.23 0.00 log file parallel write System I/O 1.23 0.00 The next section, in Listing 18-12, shows the activity broken down according the services or modules in the instance. Listing 18-12. The Top Service/Module Part of the ASH Report (Jun 28 12:29 to 13:30) Avg Active Service Module % Activity Sessions -------------------- ------------------------------ ---------- ---------SYS$BACKGROUND UNNAMED 35.80 0.01 nicko OEM.SystemPool 20.99 0.00 SYS$USERS UNNAMED 17.28 0.00 nicko OEM.BoundedPool 7.41 0.00 SYS$USERS EM_PING 6.17 0.00 The following section provides information on the top SQL command types executed in the database during the last hour: DB/Inst: NICKO/nicko (Jun 28 12:29 to 13:30) Avg Active SQL Command Type % Activity Sessions ---------------------------------------- ---------- ---------PL/SQL EXECUTE 19.75 0.00 SELECT 9.88 0.00 INSERT 1.23 0.00 UPDATE 1.23 0.00 The next segment of the report identifies the top SQL statements during the time period of the ASH analysis: Top SQL Command Types Top Service/Module DB/Inst: NICKO/nicko DB/Inst: NICKO/nicko Top User Events DB/Inst: NICKO/nicko

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(Jun 28 12:29 to 13:30)

SQL ID % Activity Event % Event --------------- ---------- ------------------------------ ---------2b064ybzkwf1y 1852 SQL*Net break/reset to client 1852 BEGIN EMD_NOTIFICATIONQUEUE_READY(:1, :2, :3); END; After this, you ll also see a section called Top SQL Using Literals that helps you identify SQL that s not using bind variables The next two segments relate to Top Sessions and Top Blocking Sessions based on enqueue waits and buffer busy wait statistics: Top Sessions DB/Inst: NICKO/nicko (Jun 28 12:29 to 13:30) -> '# Samples Active' shows the number of ASH samples in which the session was found waiting for that particular event The percentage shown in this column is calculated with respect to wall clock time and not total database activity.

Top Blocking Sessions DB/Inst: NICKO/nicko (Jun 28 12:29 to 13:30) -> Blocking session activity percentages are calculated with respect to waits on Enqueues and "buffer busy" only The next three segments summarize the top database objects, the top database files, and the top latches in the instance In the end, the ASH report provides a summary of the wait events in the database, distributed over smaller time slots than the aggregate period of analysis, as shown in Listing 18-13 In this example, the one hour time period is broken up into ten six-minute intervals This analysis helps you pinpoint performance deterioration more accurately Listing 18-13.

The subdirectory below GAC_MSIL or GAC_32 is named after the first part of the four-part assembly name (the simple name) The remaining three parts of the assembly name are mangled into the last subdirectory name 0000__656F5D1B5D4890E The first underscore (_) separates the version number from the Culture specification Since the Culture of the SampleLib assembly is neutral, the Culture specification in the mangled directory name is empty The second underscore separates the Culture specification from the PublicKeyToken..

This file contains color and font information, as well as a few other items. If the configuration file is found, it is sourced to put its contents into effect in the current shell environment. If the configuration file does not exist, the script creates it using the heredocument technique and populates a new configuration file using default values. Then the script has to source the newly created file. The configuration file is located in the user s home directory so that each user can make his own customizations. The CONNECTION_TYPE variable in the following code snippet specifies the type of connection the user would like to have as the preferred method of attaching to a remote system. The connection types include ssh, rlogin, and telnet, among others.

Summary of Wait Events over Time Intervals Activity Over Time DB/Inst: NICKO/nicko (Jun 28 12:29 to 13:30) -> Analysis period is divided into smaller time slots -> Top 3 events are reported in each of those slots -> 'Slot Count' shows the number of ASH samples in that slot -> 'Event Count' shows the number of ASH samples waiting for that event in that slot -> '% Event' is 'Event Count' over all ASH samples in the analysis period Slot Event Slot Time (Duration) Count Event Count % Event -------------------- -------- ------------------------------ -------- ------12:30:00 (60 min) 6 SQL*Net break/reset to client 3 370 null event 2 247 os thread startup 1 123 12:36:00 (60 min) 4 CPU + Wait for CPU 3 370 null event 1 123 12:42:00 (60 min) 7 CPU + Wait for CPU 2 2.

47 null event 2 247 os thread startup 2 247 12:48:00 (60 min) 9 SQL*Net break/reset to client 3 370 CPU + Wait for CPU 2 247 control file parallel write 2 247 12:54:00 (60 min) 13 control file parallel write 4 494 os thread startup 4 494 CPU + Wait for CPU 2 247 13:00:00 (60 min) 16 CPU + Wait for CPU 5 617 SQL*Net break/reset to client 4 494 null event 3 370 13:06:00 (60 min) 9 CPU + Wait for CPU 3 370.