How do I handle such thing most efficiently? Should I report them at all? Did change the following in hu.dwim.rdbms/source/oracle/conversion.lisp (dunno if this does more harm than good without unit tests but atleast the error is gone) (def function make-timezone (hours minutes)   (let ((offset-in-sec (* (+ (* 60 hours) minutes) 60)))     (if (and (= minutes 0)              (= hours 0))         +utc-zone+         (local-time::make-timezone      :subzones `((,offset-in-sec nil "anonymous" nil nil))      :name "anonymous"      :loaded t)))) to      (def function make-timezone-old (hours minutes)   (let ((offset-in-sec (* (+ (* 60 hours) minutes) 60)))     (if (and (= minutes 0)              (= hours 0))         +utc-zone+     (local-time::make-timezone      :subzones (make-array 1 :initial-contents                    (list (local-time::make-subzone                       :offset offset-in-sec)))      :name "anonymous"      :loaded t)))) to get rid of:      SYMORA> (with-symdb (execute [select * symtag])) --TIME MARK 2010-11-04-- 21:34 0           RDBMS DEBUG   About to BEGIN transaction in database #<ORACLE {100DD2F9B1}> 21:34 0           RDBMS DEBUG   Executing "SELECT * FROM symtag" STYLE-WARNING: Undefined alien: "OCIGetInstantClientPackageName" 21:34 0           RDBMS DEBUG   Connecting in transaction #<#<STANDARD-CLASS NIL {10033B8C31}> :begin-executed-p #t {1002DFA061}> 21:34 0           RDBMS DEBUG   Logging on in transaction #<#<STANDARD-CLASS NIL {10033B8C31}> :begin-executed-p #t {1002DFA061}> 21:34 0           RDBMS DEBUG   Preparing command: "SELECT * FROM symtag" 21:34 0           RDBMS DEBUG   Fetching "SYMTAG_KEY" from buffer at index 0 21:34 0           RDBMS DEBUG   Fetched: "foo" 21:34 0           RDBMS DEBUG   Fetching "SYMTAG_CREATION_DATE" from buffer at index 0 21:34 0           RDBMS DEBUG   Fetched: :NULL 21:34 0           RDBMS DEBUG   Fetching "SYMTAG_KEY" from buffer at index 0 21:34 0           RDBMS DEBUG   Fetched: "foobar" 21:34 0           RDBMS DEBUG   Fetching "SYMTAG_CREATION_DATE" from buffer at index 0 21:34 0           RDBMS DEBUG   Fetched: :NULL 21:34 0           RDBMS DEBUG   Fetching "SYMTAG_KEY" from buffer at index 0 21:34 0           RDBMS DEBUG   Fetched: "foo11" 21:34 0           RDBMS DEBUG   Fetching "SYMTAG_CREATION_DATE" from buffer at index 0 --- *sbcl debug buffer* The value ((3600 NIL "anonymous" NIL NIL)) is not of type   (SIMPLE-ARRAY T (*)).    [Condition of type TYPE-ERROR] Restarts:  0: [TERMINATE-TRANSACTION] return (values) from the WITH-TRANSACTION block executing the current terminal action :COMMIT  1: [COMMIT-TRANSACTION] mark transaction for commit only and return (values) from the WITH-TRANSACTION block  2: [ROLLBACK-TRANSACTION] mark transaction for rollback only and return (values) from the WITH-TRANSACTION block  3: [RESTART-TRANSACTION] rollback the transaction by unwinding the stack and restart the WITH-TRANSACTION block in a new database transaction  4: [RETRY] Retry SLIME REPL evaluation request.  5: [*ABORT] Return to SLIME's top level.  --more-- Backtrace:   0: (LOCAL-TIME::MAKE-TIMEZONE)[:EXTERNAL]       Locals:         SB-DEBUG::ARG-0 = 6   1: (HU.DWIM.RDBMS.ORACLE::LOCAL-TIME-FROM-TIMESTAMP-TZ #.(SB-SYS:INT-SAP #X006918C0) #<unavailable argument>)       Locals:         SB-DEBUG::ARG-0 = #.(SB-SYS:INT-SAP #X006918C0)         SB-DEBUG::ARG-1 = :<NOT-AVAILABLE>   2: (HU.DWIM.RDBMS.ORACLE::FETCH-COLUMN-VALUE #<HU.DWIM.RDBMS.ORACLE::COLUMN-DESCRIPTOR {100B9E6761}> 0)       Locals:         SB-DEBUG::ARG-0 = #<HU.DWIM.RDBMS.ORACLE::COLUMN-DESCRIPTOR {100B9E6761}>         SB-DEBUG::ARG-1 = 0   3: (CURRENT-ROW #<HU.DWIM.RDBMS.ORACLE::ORACLE-SEQUENTIAL-ACCESS-CURSOR {100B9E6E71}>)[:EXTERNAL]   4: (FOR-EACH-ROW #<CLOSURE (LAMBDA #) {100B9E8979}> #<HU.DWIM.RDBMS.ORACLE::ORACLE-SEQUENTIAL-ACCESS-CURSOR {100B9E6E71}>)[:EXTERNAL]   5: (COLLECT-ROWS #<HU.DWIM.RDBMS.ORACLE::ORACLE-SEQUENTIAL-ACCESS-CURSOR {100B9E6E71}>)[:EXTERNAL]   6: (HU.DWIM.RDBMS.ORACLE::EXECUTE-PREPARED-STATEMENT ..)[:EXTERNAL]   7: ((SB-PCL::FAST-METHOD HU.DWIM.RDBMS::EXECUTE-COMMAND (ORACLE HU.DWIM.RDBMS.ORACLE::ORACLE-TRANSACTION STRING)) ..)[:EXTERNAL]   8: ((LAMBDA (SB-PCL::.PV. SB-PCL::.NEXT-METHOD-CALL. SB-PCL::.ARG0. SB-PCL::.ARG1. SB-PCL::.ARG2. SB-INT:&MORE SB-PCL::.DFUN-MORE-CONTEXT. SB-PCL::.DFUN-MORE-COUNT.)) ..)   9: (HU.DWIM.RDBMS::CALL-WITH-TRANSACTION* #<FUNCTION (LABELS HU.DWIM.RDBMS::WITH-TRANSACTION*-BODY) {10034E8619}>)[:EXTERNAL]  10: ((LAMBDA ()))  11: (SB-INT:SIMPLE-EVAL-IN-LEXENV (WITH-SYMDB (EXECUTE (SQL #))) #<NULL-LEXENV>)  --more--   !DSPAM:4cd3227b48581611617599!