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) |
(Y|N) For internal use |
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 |
BIND_EQUIV_FAILURE |
VARCHAR2(1) |
(Y|N) The bind value's selectivity does not match that used to optimize the existing child cursor |
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) |
(Y|N) Mismatch caused by setting session parameter ERROR_ON_OVERLAP_TIME |
EDITION_MISMATCH |
VARCHAR2(1) |
(Y|N) Cursor edition mismatch |
MV_QUERY_GEN_MISMATCH |
VARCHAR2(1) |
(Y|N) Internal, used to force a hard-parse when analyzing materialized view queries |
USER_BIND_PEEK_MISMATCH |
VARCHAR2(1) |
(Y|N) 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) |
(Y|N) Cursor has typecheck dependencies |
NO_TRIGGER_MISMATCH |
VARCHAR2(1) |
(Y|N) Cursor and child have no trigger mismatch |
FLASHBACK_CURSOR |
VARCHAR2(1) |
(Y|N) Cursor non-shareability due to flashback |
ANYDATA_TRANSFORMATION |
VARCHAR2(1) |
(Y|N) Is criteria for opaque type transformation and does not match |
INCOMPLETE_CURSORFoot 1 |
VARCHAR2(1) |
(Y|N) Cursor is incomplete: typecheck heap came from call memory |
PDDL_ENV_MISMATCHFoot 2 |
VARCHAR2(1) | (Y|N) Environment setting mismatch for parallel DDL cursor (that is, one or more of the following parameter values have changed: PARALLEL_EXECUTION_ENABLED, PARALLEL_DDL_MODE, PARALLEL_DDL_FORCED_DEGREE, or PARALLEL_DDL_FORCED_INSTANCES) |
TOP_LEVEL_RPI_CURSOR |
VARCHAR2(1) |
(Y|N) Is top level RPI cursor |
DIFFERENT_LONG_LENGTH |
VARCHAR2(1) |
(Y|N) Value of LONG does not match |
LOGICAL_STANDBY_APPLY |
VARCHAR2(1) |
(Y|N) Logical standby apply context does not match |
DIFF_CALL_DURN |
VARCHAR2(1) |
(Y|N) If Slave SQL cursor/single call |
BIND_UACS_DIFF |
VARCHAR2(1) |
(Y|N) One cursor has bind UACs and one does not |
PLSQL_CMP_SWITCHS_DIFF |
VARCHAR2(1) |
(Y|N) PL/SQL anonymous block compiled with different PL/SQL compiler switches |
CURSOR_PARTS_MISMATCH |
VARCHAR2(1) |
(Y|N) Cursor was compiled with subexecution (cursor parts were executed) |
STB_OBJECT_MISMATCH |
VARCHAR2(1) |
(Y|N) STB is an internal name for a SQL Management Object Mismatch. A SQL Management Object Mismatch means that either a SQL plan baseline, or a SQL profile, or a SQL patch has been created for your SQL statement between the executions. Because a cursor is a read-only entity, a hard parse is forced to be able to create a new cursor that contains information about the new SQL management object related to this SQL statement. |
CROSSEDITION_TRIGGER_MISMATCH |
VARCHAR2(1) | (Y|N) The set of crossedition triggers to execute might differ |
PQ_SLAVE_MISMATCH |
VARCHAR2(1) |
(Y|N) Top-level slave decides not to share cursor |
TOP_LEVEL_DDL_MISMATCH |
VARCHAR2(1) |
(Y|N) Is top-level DDL cursor |
MULTI_PX_MISMATCH |
VARCHAR2(1) |
(Y|N) Cursor has multiple parallelizers and is slave-compiled |
BIND_PEEKED_PQ_MISMATCH |
VARCHAR2(1) |
(Y|N) Cursor based around bind peeked values |
MV_REWRITE_MISMATCH |
VARCHAR2(1) |
(Y|N) Cursor needs recompilation because an SCN was used during compile time due to being rewritten by materialized view |
ROLL_INVALID_MISMATCH |
VARCHAR2(1) |
(Y|N) Marked for rolling invalidation and invalidation window exceeded |
OPTIMIZER_MODE_MISMATCH |
VARCHAR2(1) |
(Y|N) Parameter OPTIMIZER_MODE mismatch (for example, all_rows versus first_rows_1) |
PX_MISMATCH |
VARCHAR2(1) |
(Y|N) 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) |
(Y|N) 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) |
(Y|N) 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) |
(Y|N) Mismatch in use of literal replacement |
PLSQL_DEBUG |
VARCHAR2(1) |
(Y|N) Value of the PLSQL_DEBUG parameter for the current session does not match the value used to build the cursor |
LOAD_OPTIMIZER_STATS |
VARCHAR2(1) |
(Y|N) A hard parse is forced in order to initialize extended cursor sharing |
ACL_MISMATCH |
VARCHAR2(1) |
(Y|N) Cached ACL evaluation result stored in the child cursor is not valid for the current session or user |
FLASHBACK_ARCHIVE_MISMATCH |
VARCHAR2(1) |
(Y|N) Value of the FLASHBACK_DATA_ARCHIVE_INTERNAL_CURSOR parameter for the current session does not match the value used to build the cursor |
LOCK_USER_SCHEMA_FAILED |
VARCHAR2(1) |
(Y|N) User or schema used to build the cursor no longer exists
Note: This sharing criterion is deprecated |
REMOTE_MAPPING_MISMATCH |
VARCHAR2(1) |
(Y|N) Reloaded cursor was previously remote-mapped and is currently not remote-mapped. Therefore, the cursor needs to be reparsed. |
LOAD_RUNTIME_HEAP_FAILED |
VARCHAR2(1) |
(Y|N) Loading of runtime heap for the new cursor (or reload of aged out cursor) failed |
HASH_MATCH_FAILED |
VARCHAR2(1) |
(Y|N) No existing child cursors have the unsafe literal bind hash values required by the current cursor |
PURGED_CURSOR |
VARCHAR2(1) |
(Y|N) Child cursor is marked for purging |
BIND_LENGTH_UPGRADEABLE |
VARCHAR2(1) |
(Y|N) Bind length(s) required for the current cursor are longer than the bind length(s) used to build the child cursor |
USE_FEEDBACK_STATSFootref 2 |
VARCHAR2(1) | (Y|N) A hard parse is forced so that the optimizer can reoptimize the query with improved cardinality estimates |
REASONFootref 2 |
CLOB |
Child number, id, and reason the cursor is not shared. The content of this column is structured using XML. |
Footnote 1 This column is not available starting with Oracle Database 11g Release 2 (11.2.0.2).
Footnote 2 This column is available starting with Oracle Database 11g Release 2 (11.2.0.2).