Db2:在线reorg操作truncate期间可能导致表无法更新

问题现象：

表在做inplace reorg allow write access时，其他应用无法更新该表，报锁超时。

 

问题原因：

1. inplace默认是allow write access的

2. inplace默认是truncate table的

根据信息中心，在truncate阶段不允许更新表的：

TRUNCATE TABLE

Reclaim all extents that are empty at the end of the table and return them to the table space. Space reclamation is run at the end of the in place reorganization. During truncation, the table is S-locked, preventing updates to the table. Updates are not possible even if ALLOW WRITE ACCESS is specified. This behavior is the default behavior.

NOTRUNCATE TABLE

This operation allows for write access through the entire reorganization when ALLOW WRITE ACCESS is specified. There is no attempt to reclaim space that is used by the table. Do not truncate the table after in place reorganization. During truncation, the table is S-locked.

 

参考资料：

https://www.ibm.com/support/knowledgecenter/SSEPGG_10.5.0/com.ibm.db2.luw.admin.cmd.doc/doc/r0001966.html