sql.bsq与数据库的创建

如果我们使用脚本创建数据库，那么最先运行的是一个叫做CreateDB.sql的脚本。
这个脚本发出CREATE DATABASE的命令,具体类似如下的例子:

CREATE DATABASE eygle
MAXINSTANCES 1
MAXLOGHISTORY 1
MAXLOGFILES 5
MAXLOGMEMBERS 3
MAXDATAFILES 100
DATAFILE '/opt/oracle/oradata/eygle/system01.dbf'
SIZE 250M REUSE AUTOEXTEND ON NEXT 10240K MAXSIZE UNLIMITED
EXTENT MANAGEMENT LOCAL
DEFAULT TEMPORARY TABLESPACE TEMP TEMPFILE '/opt/oracle/oradata/eygle/temp01.dbf'
SIZE 40M REUSE AUTOEXTEND ON NEXT 640K MAXSIZE UNLIMITED
UNDO TABLESPACE "UNDOTBS1" DATAFILE '/opt/oracle/oradata/eygle/undotbs01.dbf'
SIZE 200M REUSE AUTOEXTEND ON NEXT 5120K MAXSIZE UNLIMITED
CHARACTER SET ZHS16GBK
NATIONAL CHARACTER SET AL16UTF16
LOGFILE GROUP 1 ('/opt/oracle/oradata/eygle/redo01.log') SIZE 10240K,
GROUP 2 ('/opt/oracle/oradata/eygle/redo02.log') SIZE 10240K,
GROUP 3 ('/opt/oracle/oradata/eygle/redo03.log') SIZE 10240K;
exit;

在这个过程中，Oracle会调用$ORACLE_HOME/rdbms/admin/sql.bsq脚本，用于创建数据字典。

这个文件的位置受到一个隐含的初始化参数（_init_sql_file ）的控制:

SQL> @GetParDescrb.sql
Enter value for par: init_sql
old 6: AND x.ksppinm LIKE '%&par%'
new 6: AND x.ksppinm LIKE '%init_sql%'

NAME VALUE DESCRIB
--------------- --------------------- ------------------------------------------------------------
_init_sql_file ?/rdbms/admin/sql.bsq File containing SQL statements to execute upon database creation

如果在创建过程中，Oracle无法找到sql.bsq文件，则数据库创建将会出错.
如果我们移除sql.bsq文件，再看这样一个数据库创建过程:

[oracle@jumper scripts]$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Fri Aug 18 15:45:26 2006

Connected to an idle instance.

SQL> startup nomount;
ORACLE instance started.

Total System Global Area 252777592 bytes
Fixed Size                   451704 bytes
Variable Size             134217728 bytes
Database Buffers          117440512 bytes
Redo Buffers                 667648 bytes
SQL> @CreateDB.sql
CREATE DATABASE eygle
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced

Disconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

此时日志中会记录:

Fri Aug 18 15:45:49 2006
Errors in file /opt/oracle/admin/eygle/udump/eygle_ora_3632.trc:
ORA-01501: CREATE DATABASE failed
ORA-01526: error in opening file '?/rdbms/admin/sql.bsq'
ORA-07391: sftopn: fopen error, unable to open text file.
Error 1526 happened during db open, shutting down database
USER: terminating instance due to error 1526
Fri Aug 18 15:45:49 2006
Errors in file /opt/oracle/admin/eygle/bdump/eygle_ckpt_3623.trc:
ORA-01526: error in opening file ''
Instance terminated by USER, pid = 3632
ORA-1092 signalled during: CREATE DATABASE eygle
MAXINSTANCES 1
MAXLOGHISTORY...

这就是sql.bsq文件在数据库创建过程中的作用。知道了这个内容之后，我们可以通过手工修改sql.bsq文件来更改数据库字典对象参数，从而实现特殊要求数据库的创建或测试自定义库。

我们也可以通过修改_init_sql_file参数来重定位sql.bsq文件的位置。

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