ASP.NET Web PDF Document Viewer/Editor Control Library

parses. The first is a hard parse, which is what happens the first time a query is parsed by the database instance and includes query plan generation and optimization. The second is a soft parse, which can skip many of the steps a hard parse must do. We hard parsed the previous queries so as to not measure the work performed by that operation in the following section.

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I suggest logging out of that SQL*Plus session and logging back in before continuing, in order to get a consistent environment, or one in which no work has been done yet. Now, we will want to be able to measure the session memory of the session running the big ORDER BY queries from a second separate session. If we used the same session, our query to see how much memory we are using for sorting might itself influence the very numbers we are looking at. To measure the memory from this second session, we'll use a small SQL*Plus script I developed for this. It is actually a pair of scripts; you ll be told when to run them by the run_query.sql script. The one that resets a small table and sets a SQL*Plus variable to the SID we want to watch is called reset_stat.sql: drop table sess_stats; create table sess_stats ( name varchar2(64), value number, diff number ); variable sid number exec :sid := &1

abs cos, sin, tan cosh, sinh, tanh acos, asin, atan, atan2 ceil, floor truncate exp, log, log10 ( ** )

Note Before using this script (or any script, for that matter), make sure you understand what the script does.

This script drops and re-creates a table called SESS_STATS. If your schema already has such a table, you'll probably want to use a different name!

Absolute value of signed numeric types Trigonometric functions Hyperbolic trigonometric functions Inverse trigonometric functions Round up, round down Round toward zero Exponent, logarithm, base-10 logarithm Power

The other script is called watch_stat.sql, and for this case study, it uses the MERGE SQL statement so we can initially INSERT the statistic values for a session and then later come back and update them without needing a separate INSERT/UPDATE script: merge into sess_stats using ( select a.name, b.value from v$statname a, v$sesstat b where a.statistic# = b.statistic# and b.sid = :sid and (a.name like '%ga %' or a.name like '%direct temp%') ) curr_stats on (sess_stats.name = curr_stats.name) when matched then update set diff = curr_stats.value - sess_stats.value, value = curr_stats.value when not matched then insert ( name, value, diff ) values ( curr_stats.name, curr_stats.value, null ) / select name, case when name like '%ga %' then round(value/1024,0) else value end kbytes_writes, case when name like '%ga %' then round(diff /1024,0) else value end diff_kbytes_writes from sess_stats order by name; I emphasize the phrase "for this case study" because of the lines in bold the names of the statistics we're interested in looking at change from example to example. In this particular case, we're interested in anything with ga in it (pga and uga), or anything with direct temp, which in Oracle 10g and above will show us the direct reads and writes against temporary space (how much I/O we did reading and writing to temp).

Note In Oracle9i, direct I/O to temporary space was not labeled as such, so we used a WHERE clause that

abs (-10.0f) cos 0.0 cos 1.0 acos 1.0 ceil 1.001 truncate 8.9 exp 1.0 2.0 ** 4.0

included (and a.name like '%ga %'

When this watch_stat.sql script is run from the SQL*Plus command line, we'll see a listing of the PGA and UGA memory statistics for the session, as well as temporary I/O. Now, if you run the script @run_query 65536 in a session, you ll see output like this:

10.0f 1.0 1.543080635 0.0 2.0 8.0 2.718281828 16.0

ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> Connected. ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> SID ---------133

The F# type string is an abbreviation for .NET type System.String and represents a sequence of Unicode UTF-16 characters. In the following sections, we briefly introduce strings and the most useful functions for formatting them.

@run_query 65536 connect / set serveroutput off set echo on column sid new_val SID select sid from v$mystat where rownum = 1;