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EXAMINING SQL RESPONSE TIME WITH THE DATABASE CONTROL
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You can use the OEM Database Control to examine quickly the current SQL response time compared to a normal baseline SQL response time. The Database Control computes the SQL response time percentage by dividing the baseline SQL response time by the current SQL response time, both expressed in microseconds. If the SQL response time percentage exceeds 100 percent, then the instance is processing SQL statements slower than the baseline times. If the percentage is approximately equal to 100 percent, then the current response time and the baseline response time are equal, and your instance is performing normally. The SQL Response Time section is right on the Database Control home page.
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Using the ADDM to Analyze Performance Problems
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There s no question that the new ADDM tool should be the cornerstone of your performance-tuning efforts. In 17, I showed how you can manually get an ADDM report or use the OEM Database Control to view the ADDM analysis. Use the findings and recommendations of the ADDM advisor to fine-tune database performance. Here s the partial output from an ADDM analysis (invoked by running the addmrpt.sql script located in the $ORACLE_HOME/rdbms/admin directory). Listing 20-18 shows part of an ADDM report.
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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Listing 20-18. An Abbreviated ADDM Report DETAILED ADDM REPORT FOR TASK 'TASK_1493' WITH ID 1493 ------------------------------------------------------------------------Analysis Period: 22-JUL-2008 from 07:01:02 to 17:00:36 Database ID/Instance: 877170026/1 Database/Instance Names: NINA/nina Host Name: finance1 Database Version: 10.2.0.0 Snapshot Range: from 930 to 940 Database Time: 801313 seconds Average Database Load: 22.3 active sessions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ FINDING 1: 24% impact (193288 seconds) -------------------------------------The buffer cache was undersized causing significant additional read I/O. RECOMMENDATION 1: DB Configuration, 24% benefit (193288 seconds) ACTION: Increase SGA target size by increasing the value of parameter "sga_target" by 1232 M. SYMPTOMS THAT LED TO THE FINDING: Wait class "User I/O" was consuming significant database time. (54% impact [436541 seconds]) FINDING 2: 19% impact (150807 seconds) -------------------------------------SQL statements consuming significant database time were found. RECOMMENDATION 1: SQL Tuning, 4.4% benefit (34936 seconds) ACTION: Run SQL Tuning Advisor on the SQL statement with SQL_ID "b3bkjk3ybcp5p". RELEVANT OBJECT: SQL statement with SQL_ID b3bkjk3ybcp5p and PLAN_HASH 954860671 . . . ADDM may sometimes recommend that you run the Segment Advisor for a certain segments, or the Automatic SQL Advisor for a specific SQL statement. See 17 for a detailed analysis of an ADDM performance report.
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Using AWR Reports for Individual SQL Statements
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In 17, you learned how to use AWR reports to analyze the performance of the database during a time period encompassed by a pair of snapshots. As explained in that chapter, AWR reports are an excellent source of information for wait-related as well as other instance performance indicators. You can also use the AWR to produce reports displaying performance statistics for a single SQL statement, over a range of snapshot IDs. Listing 20-19 shows how you can get an AWR report for a particular SQL statement.
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The awrsqrpt.sql script seems to run slower than the instance-wide report-generating AWR script, awrrpt.sql, that you encountered in 17 during the introduction to AWR.
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CH A PT ER 2 0 PERF O RMAN CE TUNI NG: TUN ING TH E I NS TA NCE
Listing 20-19. Producing an AWR Report for a Single SQL Statement SQL> @$ORACLE_HOME/rdbms/admin/awrsqrpt.sql Current Instance ~~~~~~~~~~~~~~~~ DB Id DB Name Inst Num Instance ----------- ------------ -------- -----------877170026 PASPROD 1 pasprod Specify the Report Type ~~~~~~~~~~~~~~~~~~~~~~~ Would you like an HTML report, or a plain text report Enter 'html' for an HTML report, or 'text' for plain text Defaults to 'html' Enter value for report_type: text Type Specified: text Instances in this Workload Repository schema ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DB Id Inst Num DB Name Instance Host ------------ -------- ------------ ------------ -----------* 877170026 1 PASPROD pasprod prod1 Using 877170026 for database Id Using 1 for instance number Specify the number of days of snapshots to choose from ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Entering the number of days (n) will result in the most recent (n) days of snapshots being listed. Pressing <return> without specifying a number lists all completed snapshots. Enter value for num_days: 3 Listing the last 3 days of Completed Snapshots Instance DB Name Snap Id Snap Started Level ------------ ------------ --------- ------------------ ----pasprod PASPROD 1 3829 23 Apr 2008 00:01 1 3830 23 Apr 2008 02:00 1 3832 23 Apr 2008 03:00 1 3833 23 Apr 2008 04:00 1 3834 23 Apr 2008 05:00 1 3835 23 Apr 2008 06:00 1 Specify the Begin and End Snapshot Ids ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Enter value for begin_snap: 3830 Begin Snapshot Id specified: 3830 Enter value for end_snap: 3835 End Snapshot Id specified: 3835 Specify the Report Name ~~~~~~~~~~~~~~~~~~~~~~~ The default report file name is 1_3830_3835. To use this name, press <return> to continue, otherwise enter an alternative. Enter value for report_name Using the report name 1_3830_3835 Specify the SQL Id ~~~~~~~~~~~~~~~~~~ Enter value for sql_id: 9a64dvpzyrzza:
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