Question

我们有一个将LONG列转换为LOB的迁移脚本，如Oracle migration guide中所述，该表的索引现在需要重建。

假设表名为MY_TABLE，我一直在尝试运行此脚本：

BEGIN
    FOR index_entry IN (
        select INDEX_NAME from user_indexes where table_name='MY_TABLE' and index_type='NORMAL'
    )
    LOOP
        ALTER INDEX index_entry.index_name REBUILD;
    END LOOP;
END;

但是，它失败并出现以下语法错误：

PLS-00103: Encountered the symbol "ALTER" when expecting one of the following:

   ( begin case declare exit for goto if loop mod null pragma
   raise return select update while with <an identifier>
   <a double-quoted delimited-identifier> <a bind variable> <<
   continue close current delete fetch lock insert open rollback
   savepoint set sql execute commit forall merge pipe purge
 [Failed SQL: BEGIN
                FOR index_entry IN (
                    select INDEX_NAME from user_indexes where table_name='MY_TABLE' and index_type='NORMAL'
                )
                LOOP
                    ALTER INDEX index_entry.index_name REBUILD]

即使此似乎与此处指定的语法相匹配：Database PL/SQL Language Reference

ALTER不是在循环中使用的有效命令吗？

修改： lad2025 的建议，尝试使用EXECUTE IMMEDIATE，如此：

5: LOOP
6:     execute immediate 'alter index ' || index_entry.index_name || ' rebuild';
7: END LOOP;

我收到：

ORA-06550: line 6, column 92:
PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following:

   * & = - + ; < / > at in is mod remainder not rem return
   returning <an exponent (**)> <> or != or ~= >= <= <> and or
   like like2 like4 likec between into using || bulk member
   submultiset

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)

编辑2 EXECUTE IMMEDIATE正常运行。文件结束问题与Liquibase执行我的脚本有关，而我忘记用以下内容定义<sql>块：

<sql dbms="oracle" splitStatements="false">
                                    ^ defaults to true

重要的是，默认情况下，Liquibase会以分号分割语句，这需要关闭。

Answer 1

您不能在PL / SQL块中使用DDL语句。使用Dynamic-SQL：

BEGIN
    ...
    EXECUTE IMMEDIATE 'ALTER INDEX ' || index_entry.INDEX_NAME || ' REBUILD';
END

修改

尝试：

DECLARE BEGIN FOR index_entry IN (select INDEX_NAME from user_indexes where table_name='MY_TABLE' and index_type='NORMAL') LOOP dbms_output.put_line('ALTER INDEX ' || index_entry.INDEX_NAME || ' REBUILD'); EXECUTE IMMEDIATE 'ALTER INDEX ' || index_entry.INDEX_NAME || ' REBUILD'; END LOOP; END; /

的 SqlFiddleDemo

重建特定Oracle表的所有常规索引

1 个答案: