向 Oracle OLTP 表添加列

发布于 2024-10-17 06:28:48 字数 318 浏览 9 评论 0原文

我正在尝试在应用程序运行且繁忙时向 Oracle 10 OLTP 数据库中的常用表添加可为空列。添加可为空的列只是数据字典的更改，因此任何表锁都只会保留很短的时间（可以由系统处理）。

问题是我的 ALTER TABLE 经常会失败：

ORA-00054: resource busy and acquire with NOWAIT specified

我当前的方法是通过运行它来强行更改，直到表上碰巧没有锁。这意味着我无法在 SQL*Plus 中完整运行这样的脚本，但需要复制并粘贴每个语句并确保其有效。

有更好的办法吗？

原文

I'm attempting to add a nullable column to a frequently used table in an Oracle 10 OLTP database while the application is running and busy. Adding a nullable column is only a data dictionary change and therefore any table lock is only held for a short period of time (which can be handled by the system).

The problem is that my ALTER TABLE often fails with this:

ORA-00054: resource busy and acquire with NOWAIT specified

My current approach is to bludgen the change in by running it until there happens to be no locks on the table. This means I can't run such a script in SQL*Plus in full, but need to copy and paste each statement and make sure it works.

Is there a better way?

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南七夏 2024-10-24 06:28:48

暴力方法怎么样？将其置于无限循环中并在完成后退出。伪代码（尚未检查）：

create or replace 
procedure execDDL(ddl in varchar2) is
   myexp EXCEPTION;
   pragma exception_init (myexp, -54);
begin

 loop
   begin
      execute immediate ddl;
      exit;
   exception
      when myexp then 
         null;
 end loop;
 end;

How about a brute force approach? Put it in an infinite loop and exit it when done. Pseudocode(haven't checked it):

create or replace 
procedure execDDL(ddl in varchar2) is
   myexp EXCEPTION;
   pragma exception_init (myexp, -54);
begin

 loop
   begin
      execute immediate ddl;
      exit;
   exception
      when myexp then 
         null;
 end loop;
 end;

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