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テーブルSYS.DIR$に対する実行回数の多い時の診断方法 (Doc ID 2256548.1)

Last updated on AUGUST 04, 2018

適用範囲:

Oracle Database - Enterprise Edition - バージョン 12.1.0.1 以降
この文書の内容はすべてのプラットフォームに適用されます。
本文書利用上のご注意
  本文書は英語の文書 <Document 2230171.1> (最終メジャー更新日: 2017年2月9日) の日本語翻訳版です。
  英語の文書の最終メジャー更新日が新しい場合は本文書に適宜反映いたします。

現象



WORKLOAD REPOSITORY report for

DB Name DB Id     Instance Inst num Startup Time      Release      RAC
ORCL3   698463995 orcl3       1     18-Sep-16 03:09   12.1.0.2.0   NO

Host Name Platform            CPUs Cores Sockets Memory (GB)
my-host   Linux x86 64-bit     24    12     2      62.81

Snap Id           Snap Time          Sessions Cursors/Session
Begin Snap: 43100 17-Oct-16 00:00:35 66            3.0
End Snap:   43104 17-Oct-16 04:00:20 58            1.6
Elapsed: 239.75 (mins)
DB Time: 307.17 (mins)
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Top 10 Foreground Events by Total Wait Time

Event Waits Total Wait Time (sec) Wait Avg(ms) % DB time Wait Class

DB CPU 7408.1 40.2
db file sequential read 1,444,192 5569.3 3.86 30.2 User I/O
read by other session     150,659 1081.5 7.18  5.9 User I/O
db file parallel read      35,236 278.2  7.89  1.5 User I/O
db file scattered read     34,328 260.9  7.60  1.4 User I/O
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SQL ordered by CPU Time

CPU Time (s) Executions CPU per Exec (s) %Total Elapsed Time (s) %CPU %IO SQL Id SQL Module SQL Text
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. /* Presence of Data Pump query against SYS.LOADER_DIR_OBJS while accessing an external table. */
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132.00 880 0.15 1.78 132.05 99.96 0.01 f5ra7dru5fk5n Data Pump Worker SELECT NAME, PATH, READ, WRITE, EXECUTE FROM SYS.LOADER_DIR_OBJS
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SQL ordered by Executions

/* High number of executions of query against SYS.DIR$, although very few of them actually return any rows. */

Executions Rows Processed Rows per Exec Elapsed Time (s) %CPU %IO SQL Id SQL Module SQL Text

1,481,940 3,540 0.00 43.34 98.8 0 67n5u0a0q4d7u select audit$, os_path from dir$...
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変更点

 

原因

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