Our system infos are ArcSDE 9.3.1 and Oracle 126.96.36.199 and there are some bugs.
1. MXT prefixed files are displayed in ArcCatalog.
2. When editing in graphical layers, some features on some of these layers are not shown. After reconsile/post and compress, these errors are repaired.
in sde_esri_sde.log file, the below lines occur in this error
[Thu Oct 02 14:04:43 2014]  [CBS-XXYYZZ] db_array_fetch_spix_recs OCI Fetch Error (13050)
[Thu Oct 02 14:04:43 2014]  [CBS-XXYYZZ] load_buffer error -51 on ST_STREET, rowid -1