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Diving Into the Shared Pool - An In Depth Look at Tuning the Shared Pool (Part 2)

Oracle Tips by Mike Ault

A Matter Of Hashing

The script in Figure 4 produces a report similar to that shown in Figure 5. The report in Figure 5 shows which users are generating SQL that hashes to the same values. Once you have a user isolated you can then run the script in figure 7 to find the bad SQL statements.


Date: 11/20/98                                              Page:   1

Time: 11:40 AM            Shared Hash Value Report          AULTM

                              DCARS database


                               Total Hash  SQL With SQL Sharing

USERNAME                           Values Same Hash        Hash

------------------------------ ---------- --------- -----------

AULTM                                 129         0     100.000

DCARS                                6484        58      99.105

MCNAIRT                                20         0     100.000

PASSMAP                                 2         0     100.000

QRemote DBA                                  109         0     100.000

RCAPS                                 270         0     100.000

RCOM                                  342         7      97.953

REPORTS1                               28         0     100.000

SECURITY_ADMIN                         46         0     100.000

SYS                                   134         0     100.000

                               ---------- ---------

sum                                  7564        65


Figure 5: Hash Report

If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.

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