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The Top 5 Timed Events section shows the wait situation in your instance during the specified period. In the following example, user I/O is contributing a vast majority of the instance waits: Top 5 Timed Events ~~~~~~~~~~~~~~~~~~ % Total Event Waits Time (s) DB Time ------------------------------ ------------ ----------- --------db file sequential read 30,650,078 308,185 64.21 CPU time 63,520 13.23 db file scattered read 3,641,607 34,740 7.24 read by other session 2,256,127 15,262 3.18 wait for SGA component shrink 14,012 14,079 2.93 Wait Class -----------User I/O User I/O User I/O Other

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The Time Model Statistics section shows what the instance is spending its time on, as you can see in Listing 18-6. Listing 18-6. The Time Model Statistics Section of an AWR Report Time Model Statistics DB/Inst: ORCL/orcl -> ordered by Time (seconds) desc Snaps: 3309-3313

The code consists of two scripts. The first one (window) sets up the configuration environment and then opens a small window in which it starts the where script. The second script (where) is run within the window. It performs all the logic for the new connection. It determines the connection type, opens the connection, and configures the colors and appearance of the new window connected to the remote system. First we set up some default variables for the where window initialization. We also set up variables for the location of the configuration file for the initial window s title, and the foreground and background colors.

Time % Total Statistic Name (seconds) DB Time --------------------------------------------- -------------- ----------DB time 10,860.27 100.00 sql execute elapsed time 9,989.24 91.98 DB CPU 6,605.53 60.82 background elapsed time 1,693.64 15.59 parse time elapsed 991.06 9.13 hard parse elapsed time 977.66 9.00 background cpu time 837.48 7.71 PL/SQL compilation elapsed time 385.77 3.55 Java execution elapsed time 268.49 2.47 PL/SQL execution elapsed time 246.51 2.27 failed parse elapsed time 84.06 .77 inbound PL/SQL rpc elapsed time 43.14 .40 connection management call elapsed time 17.47 .16 hard parse (sharing criteria) elapsed time 4.25 .04 hard parse (bind mismatch) elapsed time .50 .00 You can review SQL statements in the SQL Ordered by Elapsed Time section. This section of the report, shown in Listing 18-7, shows the top SQL statements during the period of analysis, ranked according to the total elapsed time, the CPU time consumed, and the percentage of total DB time used.

Listing 18-7. The SQL Ordered by Elapsed Time Section of an AWR Report SQL ordered by Elapsed Time DB/Inst: ORCL/orcl Snaps: 3309-3313 -> Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code. -> % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100 Elapsed CPU Elap per % Total Time (s) Time (s) Executions Exec (s) DB Time SQL Id ---------- ---------- ------------ ---------- ------- ------------15,970 3,769 24 665.4 3.3 dvycj85pfmb1b Module: PRNTREPORT UPDATE UNIT_USERS UR SET UR.CARD_PRINTED_FLAG = 'Y' WHERE UR.CHARTER_ID IN (SELECT DISTINCT CHARTER_ID FROM PS_LASER_CARDS WHERE BATCH_ID = :B1 ) AND UR.P OSNTYP_CODE IN ('V','M','O') AND UR.POSN_CODE NOT IN ('AP','IH') AND UR.REGISTRA NT_STATUS IN ('X','R','N') AND UR.CARD_PRINTED_FLAG = 'N' Operating system statistics are listed next: Operating System Statistics Statistic Name Value ----------------------------------- -----------------AVG_BUSY_TICKS 989,293 AVG_IDLE_TICKS 1,971,976 AVG_IOWAIT_TICKS 125,186 AVG_SYS_TICKS 447,993 AVG_USER_TICKS 540,353 BUSY_TICKS 15,845,441 IDLE_TICKS 31,567,835 The Segments by Physical Reads section, shown in Listing 18-8, lists the database objects (tables and indexes) that have the highest percentage of physical reads. Listing 18-8. The Segments by Physical Reads Section of an AWR Report Segments by Physical Reads DB/Inst: ORCL/orcl Snaps: 3309-3313 Tablespace Subobject Obj. Physical Owner Name Object Name Name Type Reads %Total ---------- ---------- -------------------- ---------- ----- ------------ ------PAS UNIT_REGIS UNIT_REGISTRANTS TABLE 18,003,616 21.08 PAS CAMPAIGN_P CAMPAIGN_POSITIONS TABLE 15,319,556 17.94 PAS OT_D01 PAYMENT_CATEGORY_BAT TABLE 11,799,007 13.81 PAS PERSONNEL_D PERSONNEL TABLE 7,189,914 8.42 ------------------------------------------------------------------------. . . End of Report

I only highlighted a few of the categories of information contained in a typical AWR report. Run the awrrpt.sql script to get a full picture of your instance performance over a specified period of time. In addition to the information listed previously, you get important wait information, as well as detailed logical and physical reads analysis based on SQL statements and on a per-data-file basis.

The best way to view AWR data is by using the OEM Database Control. Of course, you can also run the awrrpt.sql script, as shown earlier, to view a summary of the AWR data.