Slide 6
Slide 6 text
© 2024 NTT DATA Corporation 6
Analysis of SQL report
• SQL report of delayed SQL for the time period of the event
Stat Name Statement Per Execution % Snap
---------------------------------------- ---------- -------------- -------
Elapsed Time (ms) 3,003,205 3,003,205.2 17.0
CPU Time (ms) 181,891 181,890.7 1.9
Executions 1 1.0 0.0
Buffer Gets 3,464,444 3,464,444.0 0.2
Disk Reads 2,910,047 2,910,047.0 1.8
Parse Calls 1 1.0 0.0
Rows 5,353,657 5,353,657.0 N/A
User I/O Wait Time (ms) 2,936,823 2,936,823.1 35.9
・・・
IO Interconnect (GB) 22 21.5 0.8
Uncompressed (GB) 1 1.0 0.1
IO Interconnect Ret for Smart Scan (GB) 0 N/A N/A
SELECT ・・・ FROM XXXTBL WHERE XXXFLG <> '1' OR XXXFLG IS NULL;
-------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 5353K| 255M| 1593 (8)| 00:00:01 |
|* 1 | TABLE ACCESS STORAGE FULL| XXXTBL | 5353K| 255M| 1593 (8)| 00:00:01 |
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Execution
Plan
Statistics
Significant IO waits. 98% of
processing time is IO
waiting
Smart scan not working.
22GB of IO is occurring
(segment size of the table is
about 1GB)
Full scan of a single table