crystal report ean 13 Effect of Setting echo on in SQL*Plus in Font

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Effect of Setting echo on in SQL*Plus
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Prior to running the SQL*Plus code examples in this book, the script issues the set echo on command: SQL> set echo on The effect of this on SQL*Plus output can be explained by the following simple example. Suppose we are running a script, demo_echo_option.sql, the contents of which are as follows: set echo on drop table t1; create table t1 ( x number, y varchar2(30), z date ); The output of the preceding script when executed as the user SCOTT looks like this: scott@ORA10G> set echo on scott@ORA10G> drop table t1; Table dropped. scott@ORA10G> create table t1 2 ( 3 x number, 4 y varchar2(30), 5 z date 6 ); Table created.
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CHAPTER 1 PERFORMANCE TOOLKIT
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Note in particular the SQL prompt (due to the login.sql script) and the fact that the line numbers are shown. You need to be familiar with the preceding form of output, as all SQL*Plus examples in this book use it.
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Setting Up the SCOTT/TIGER Schema
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Many of the examples in this book draw on the emp/dept tables in the SCOTT schema. I recommend that you install your own copy of these tables in some account other than SCOTT to avoid side effects caused by other users using and modifying the same data. In Oracle9i and earlier, follow these steps to create the SCOTT demonstration tables in your own schema: 1. From the command line, run cd [ORACLE_HOME]/sqlplus/demo. 2. Log into SQL*Plus as the required user. 3. Run @demobld.sql. The demobld.sql script will create and populate five tables for you. When the script is complete, it exits SQL*Plus automatically, so don t be surprised when SQL*Plus disappears after running the script. If you would like to drop this schema at any time to clean up, simply execute [ORACLE_HOME]/sqlplus/demo/demodrop.sql. In 10g, you install the SCOTT schema by executing [ORACLE_HOME]/rdbms/admin/utlsampl.sql.
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Setting Up the BENCHMARK/BENCHMARK Schema
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Some of the code examples in this book have a user called BENCHMARK with the password BENCHMARK. You can install this user by executing the script cr_benchmark_user.sql in the directory code\mysqlscripts. You can find this script in the code download area for this book at http://www.apress.com. The content of the script follows. As you can see, the script also contains various grants and privileges used when I discuss concepts in different chapters, and also required by some utilities that we execute as the user BENCHMARK: create user benchmark identified by benchmark default tablespace users quota unlimited on users; grant create create create create create create create create create create any directory, session, table, view, synonym, materialized view, procedure, trigger, sequence, type to benchmark;
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grant select on v_$session_cursor_cache to benchmark;
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CHAPTER 1 PERFORMANCE TOOLKIT
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select on v_$sesstat to benchmark; select on v_$open_cursor to benchmark; select on v_$sql to benchmark; select on v_$sqlarea to benchmark; create any context to benchmark; drop any context to benchmark; select on sys.col$ to benchmark; -- query data dict select on sys.dba_segments to benchmark; -- for block dump select on v_$process to benchmark
Performance Tools
We ll also make use of other performance tools throughout the book. This section presents brief setup instructions for these tools.
timed_statistics
The timed_statistics parameter specifies whether Oracle should measure the execution time for various internal operations. Without this parameter set, there is much less value to the trace file output. As with other parameters, you can set timed_statistics either on an instance level (in init.ora) or on a session level. The former shouldn t affect performance, so it s generally recommended. Simply add the following line to your init.ora file, and the next time you restart the database, timed_statistics will be enabled: timed_statistics=true On a session level, you would issue this SQL> alter session set timed_statistics=true; Use the preceding method to set this parameter from your JDBC programs when required.
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