V$SQL_SHARED_CURSOR

V$SQL_SHARED_CURSOR explains why a particular child cursor is not shared with existing child cursors. Each column identifies a specific reason why the cursor cannot be shared.

Column	Datatype	Description
`SQL_ID`	`VARCHAR2(13)`	SQL identifier
`ADDRESS`	`RAW(4 \| 8)`	Address of the parent cursor
`CHILD_ADDRESS`	`RAW(4 \| 8)`	Address of the child cursor
`CHILD_NUMBER`	`NUMBER`	Child number
`UNBOUND_CURSOR`	`VARCHAR2(1)`	(`Y\|N`) The existing child cursor was not fully built (in other words, it was not optimized)
`SQL_TYPE_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The SQL type does not match the existing child cursor
`OPTIMIZER_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The optimizer environment does not match the existing child cursor
`OUTLINE_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The outlines do not match the existing child cursor
`STATS_ROW_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The existing statistics do not match the existing child cursor
`LITERAL_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) Non-data literal values do not match the existing child cursor
`FORCE_HARD_PARSE`	`VARCHAR2(1)`	???
`SEC_DEPTH_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) Security level does not match the existing child cursor
`EXPLAIN_PLAN_CURSOR`	`VARCHAR2(1)`	(`Y\|N`) The child cursor is an explain plan cursor and should not be shared
`BUFFERED_DML_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) Buffered DML does not match the existing child cursor
`PDML_ENV_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) PDML environment does not match the existing child cursor
`INST_DRTLD_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) Insert direct load does not match the existing child cursor
`SLAVE_QC_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The existing child cursor is a slave cursor and the new one was issued by the coordinator (or, the existing child cursor was issued by the coordinator and the new one is a slave cursor)
`TYPECHECK_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The existing child cursor is not fully optimized
`AUTH_CHECK_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) Authorization/translation check failed for the existing child cursor
`BIND_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The bind metadata does not match the existing child cursor
`DESCRIBE_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The typecheck heap is not present during the describe for the child cursor
`LANGUAGE_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The language handle does not match the existing child cursor
`TRANSLATION_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The base objects of the existing child cursor do not match
`ROW_LEVEL_SEC_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The row level security policies do not match
`INSUFF_PRIVS`	`VARCHAR2(1)`	(`Y\|N`) Insufficient privileges on objects referenced by the existing child cursor
`INSUFF_PRIVS_REM`	`VARCHAR2(1)`	(`Y\|N`) Insufficient privileges on remote objects referenced by the existing child cursor
`REMOTE_TRANS_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) The remote base objects of the existing child cursor do not match
`LOGMINER_SESSION_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) LogMiner Session parameters mismatch
`INCOMP_LTRL_MISMATCH`	`VARCHAR2(1)`	(`Y\|N`) Cursor might have some binds (literals) which may be unsafe/non-data. Value mismatch.
`OVERLAP_TIME_MISMATCH`	`VARCHAR2(1)`	Mismatch caused by setting session parameter `ERROR_ON_OVERLAP_TIME`
`EDITIONS_MISMATCH`	`VARCHAR2(1)`	???
`SQL_REDIRECT_MISMATCH`	`VARCHAR2(1)`	SQL redirection mismatch
`MV_QUERY_GEN_MISMATCH`	`VARCHAR2(1)`	Internal, used to force a hard-parse when analyzing materialized view queries
`USER_BIND_PEEK_MISMATCH`	`VARCHAR2(1)`	Cursor is not shared because value of one or more user binds is different and this has a potential to change the execution plan
`TYPCHK_DEP_MISMATCH`	`VARCHAR2(1)`	Cursor has typecheck dependencies
`NO_TRIGGER_MISMATCH`	`VARCHAR2(1)`	Cursor and child have no trigger mismatch
`FLASHBACK_CURSOR`	`VARCHAR2(1)`	Cursor non-shareability due to flashback
`ANYDATA_TRANSFORMATION`	`VARCHAR2(1)`	Is criteria for opaque type transformation and does not match
`INCOMPLETE_CURSOR`	`VARCHAR2(1)`	Cursor is incomplete: typecheck heap came from call memory
`TOP_LEVEL_RPI_CURSOR`	`VARCHAR2(1)`	Is top level RPI cursor
`DIFFERENT_LONG_LENGTH`	`VARCHAR2(1)`	Value of `LONG` does not match
`LOGICAL_STANDBY_APPLY`	`VARCHAR2(1)`	Logical standby apply context does not match
`DIFF_CALL_DURN`	`VARCHAR2(1)`	If Slave SQL cursor/single call
`BIND_UACS_DIFF`	`VARCHAR2(1)`	One cursor has bind UACs and one does not
`PLSQL_CMP_SWITCHS_DIFF`	`VARCHAR2(1)`	PL/SQL anonymous block compiled with different PL/SQL compiler switches
`CURSOR_PARTS_MISMATCH`	`VARCHAR2(1)`	Cursor was compiled with subexecution (cursor parts were executed)
`STB_OBJECT_MISMATCH`	`VARCHAR2(1)`	STB has come into existence since cursor was compiled
`EDITION_FOR_TRIGGERS_MISMATCH`	VARCHAR2(1)	???
`PQ_SLAVE_MISMATCH`	`VARCHAR2(1)`	Top-level slave decides not to share cursor
`TOP_LEVEL_DDL_MISMATCH`	`VARCHAR2(1)`	Is top-level DDL cursor
`MULTI_PX_MISMATCH`	`VARCHAR2(1)`	Cursor has multiple parallelizers and is slave-compiled
`BIND_PEEKED_PQ_MISMATCH`	`VARCHAR2(1)`	Cursor based around bind peeked values
`MV_REWRITE_MISMATCH`	`VARCHAR2(1)`	Cursor needs recompilation because an SCN was used during compile time due to being rewritten by materialized view
`ROLL_INVALID_MISMATCH`	`VARCHAR2(1)`	Marked for rolling invalidation and invalidation window exceeded
`OPTIMIZER_MODE_MISMATCH`	`VARCHAR2(1)`	Parameter `OPTIMIZER_MODE` mismatch (for example, all_rows versus first_rows_1)
`PX_MISMATCH`	`VARCHAR2(1)`	Mismatch in one parameter affecting the parallelization of a SQL statement. For example, one cursor was compiled with parallel DML enabled while the other was not.
`MV_STALEOBJ_MISMATCH`	`VARCHAR2(1)`	Cursor cannot be shared because there is a mismatch in the list of materialized views which were stale at the time the cursor was built
`FLASHBACK_TABLE_MISMATCH`	`VARCHAR2(1)`	Cursor cannot be shared because there is a mismatch with triggers being enabled and/or referential integrity constraints being deferred
`LITREP_COMP_MISMATCH`	`VARCHAR2(1)`	Mismatch in use of literal replacement