DB2中SQLSTATE=57016 SQLCODE=-668，原因码 "7"的解决

在DB2数据库中执行以下操作后，无法向 tablename 表里插入数据。

alter table tablename add xxx decimal(20);

alter table tablename drop xxx;

执行命令： reorg table tablename 后正常。

参考原文为：

Operation not allowed for reason code reason-code on table table-name.

Explanation: Access to table table-name is restricted. The cause is based on the following reason codes reason-code: 7

The table is in the reorg pending state. This can occur after an ALTER TABLE statement containing a REORG-recommended operation.7

Reorganize the table using the REORG TABLE command (note that INPLACE REORG TABLE is not allowed for a table that is in the reorg pending state).

其中：

reorg table <tablename> 通过重构行来消除“碎片”数据并压缩信息，对表进行重组。

runstats on table <tbschema>.<tbname> 收集表 <tbname> 的统计信息。

reorgchk on table all 确定是否需要对表进行重组，对于对所有表自动执行 runstats 很有用。

>>> reorg 和runstats 都是单个表优化，初始化的命令：

runstats on table administrator.test;

reorg table administrator.test;