ALERT日志出现：
kewastUnPackStats(): bad magic 1 (0x7f3521c489a0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c489a0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c458e0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c48ad0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c48ad0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c48ad0, 0)
kewastUnPackStats(): bad magic 1 (0x7f3521c48ad0, 0)SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> show parameter comp
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cell_offload_compaction string ADAPTIVE
compatible string 11.2.0.0.0
nls_comp string BINARY
plsql_v2_compatibility boolean FALSE这是一个已知BUG导致的，主要是由于升级到11g后的一些变更导致的，以下是MOS的相关文档：
Kewastunpackstats(): Bad Magic 1 (0x1108f7b87, 0) In Alert Logfile After Upgrading to 11.2.0.1 (Doc ID 1227524.1)
文档提示，这是由于ASH信息读取出错导致的：
It is caused by the variable part of the Active Session History rows (the moduile, action program, etc. information) not being stored properly, causing any read-back of this data through views like (G)V$ACTIVE_SESSION_HISTORY to fail.11.2.0.2之后的补丁集中被修正。