V$SQL - DB CAFE

V$SQL V$SQL lists statistics on shared SQL areas without the GROUP BY clause and contains one row for each child of the original SQL text entered. Statistics displayed in V$SQL are normally updated at the end of query execution. However, for long running queries, they are updated every 5 seconds. This makes it easy to see the impact of long running SQL statements while they are still in progress.

Column Datatype Description SQL_TEXT VARCHAR2(1000) First thousand characters of the SQL text for the current cursor SQL_FULLTEXT CLOB Full text for the SQL statement exposed as a CLOB column. The full text of a SQL statement can be retrieved using this column instead of joining with the V$SQLTEXT dynamic performance view. SQL_ID VARCHAR2(13) SQL identifier of the parent cursor in the library cache SHARABLE_MEM NUMBER Amount of shared memory used by the child cursor (in bytes) PERSISTENT_MEM NUMBER Fixed amount of memory used for the lifetime of the child cursor (in bytes) RUNTIME_MEM NUMBER Fixed amount of memory required during the execution of the child cursor SORTS NUMBER Number of sorts that were done for the child cursor LOADED_VERSIONS NUMBER Indicates whether the context heap is loaded (1) or not (0) OPEN_VERSIONS NUMBER Indicates whether the child cursor is locked (1) or not (0) USERS_OPENING NUMBER Number of users that have any of the child cursors open FETCHES NUMBER Number of fetches associated with the SQL statement EXECUTIONS NUMBER Number of executions that took place on this object since it was brought into the library cache PX_SERVERS_EXECUTIONS NUMBER Total number of executions performed by parallel execution servers (0 when the statement has never been executed in parallel) END_OF_FETCH_COUNT NUMBER Number of times this cursor was fully executed since the cursor was brought into the library cache. The value of this statistic is not incremented when the cursor is partially executed, either because it failed during the execution or because only the first few rows produced by this cursor are fetched before the cursor is closed or re-executed. By definition, the value of the END_OF_FETCH_COUNT column should be less or equal to the value of the EXECUTIONS column. USERS_EXECUTING NUMBER Number of users executing the statement LOADS NUMBER Number of times the object was either loaded or reloaded FIRST_LOAD_TIME VARCHAR2(19) Timestamp of the parent creation time INVALIDATIONS NUMBER Number of times this child cursor has been invalidated PARSE_CALLS NUMBER Number of parse calls for this child cursor DISK_READS NUMBER Number of disk reads for this child cursor DIRECT_WRITES NUMBER Number of direct writes for this child cursor BUFFER_GETS NUMBER Number of buffer gets for this child cursor APPLICATION_WAIT_TIME NUMBER Application wait time (in microseconds) CONCURRENCY_WAIT_TIME NUMBER Concurrency wait time (in microseconds) CLUSTER_WAIT_TIME NUMBER Cluster wait time (in microseconds) USER_IO_WAIT_TIME NUMBER User I/O Wait Time (in microseconds) PLSQL_EXEC_TIME NUMBER PL/SQL execution time (in microseconds) JAVA_EXEC_TIME NUMBER Java execution time (in microseconds) ROWS_PROCESSED NUMBER Total number of rows the parsed SQL statement returns COMMAND_TYPE NUMBER Oracle command type definition OPTIMIZER_MODE VARCHAR2(10) Mode under which the SQL statement was executed OPTIMIZER_COST NUMBER Cost of this query given by the optimizer OPTIMIZER_ENV RAW(2000) Optimizer environment OPTIMIZER_ENV_HASH_VALUE NUMBER Hash value for the optimizer environment PARSING_USER_ID NUMBER User ID of the user who originally built this child cursor PARSING_SCHEMA_ID NUMBER Schema ID that was used to originally build this child cursor PARSING_SCHEMA_NAME VARCHAR2(30) Schema name that was used to originally build this child cursor KEPT_VERSIONS NUMBER Indicates whether this child cursor has been marked to be kept pinned in the cache using the DBMS_SHARED_POOL package ADDRESS RAW(4 | 8) Address of the handle to the parent for this cursor TYPE_CHK_HEAP RAW(4) Descriptor of the type check heap for this child cursor HASH_VALUE NUMBER Hash value of the parent statement in the library cache OLD_HASH_VALUE NUMBER Old SQL hash value PLAN_HASH_VALUE NUMBER Numeric representation of the SQL plan for this cursor. Comparing one PLAN_HASH_VALUE to another easily identifies whether or not two plans are the same (rather than comparing the two plans line by line). CHILD_NUMBER NUMBER Number of this child cursor SERVICE VARCHAR2(64) Service name SERVICE_HASH NUMBER Hash value for the name listed in the SERVICEcolumn MODULE VARCHAR2(64) Contains the name of the module that was executing at the time that the SQL statement was first parsed, which is set by calling DBMS_APPLICATION_INFO.SET_MODULE MODULE_HASH NUMBER Hash value of the module listed in the MODULE column ACTION VARCHAR2(64) Contains the name of the action that was executing at the time that the SQL statement was first parsed, which is set by calling DBMS_APPLICATION_INFO.SET_ACTION ACTION_HASH NUMBER Hash value of the action listed in the ACTION column SERIALIZABLE_ABORTS NUMBER Number of times the transaction failed to serialize, producing ORA-08177 errors, per cursor OUTLINE_CATEGORY VARCHAR2(64) If an outline was applied during construction of the cursor, then this column displays the category of that outline. Otherwise the column is left blank. CPU_TIME NUMBER CPU time (in microseconds) used by this cursor for parsing, executing, and fetching ELAPSED_TIME NUMBER Elapsed time (in microseconds) used by this cursor for parsing, executing, and fetching. If the cursor uses parallel execution, then ELAPSED_TIME is the cumulative time for the query coordinator, plus all parallel query slave processes. OUTLINE_SID NUMBER Outline session identifier CHILD_ADDRESS RAW(4 | 8) Address of the child cursor SQLTYPE NUMBER Denotes the version of the SQL language used for this statement REMOTE VARCHAR2(1) Indicates whether the cursor is remote mapped (Y) or not (N) OBJECT_STATUS VARCHAR2(19) Status of the cursor: VALID - Valid, authorized without errors

VALID_AUTH_ERROR - Valid, authorized with authorization errors

VALID_COMPILE_ERROR - Valid, authorized with compilation errors

VALID_UNAUTH - Valid, unauthorized

INVALID_UNAUTH - Invalid, unauthorized

INVALID - Invalid, unauthorized but keep the timestamp

LITERAL_HASH_VALUE NUMBER Hash value of the literals which are replaced with system-generated bind variables and are to be matched, when CURSOR_SHARING is used. This is not the hash value for the SQL statement. If CURSOR_SHARING is not used, then the value is 0. LAST_LOAD_TIME VARCHAR2(19) Time at which the query plan was loaded into the library cache IS_OBSOLETE VARCHAR2(1) Indicates whether the cursor has become obsolete (Y) or not (N). This can happen if the number of child cursors is too large. IS_BIND_SENSITIVE VARCHAR2(1) Indicates whether the cursor is bind sensitive (Y) or not (N). A query is considered bind-sensitive if the optimizer peeked at one of its bind variable values when computing predicate selectivities and where a change in a bind variable value may cause the optimizer to generate a different plan. IS_BIND_AWARE VARCHAR2(1) Indicates whether the cursor is bind aware (Y) or not (N). A query is considered bind-aware if it has been marked to use extended cursor sharing. The query would already have been marked as bind-sensitive. IS_SHAREABLE VARCHAR2(1) Indicates whether the cursor can be shared (Y) or not (N) CHILD_LATCH NUMBER Child latch number that is protecting the cursor. This column is obsolete and maintained for backward compatibility. SQL_PROFILE VARCHAR2(64) SQL profile used for this statement, if any SQL_PATCH VARCHAR2(30) SQL patch used for this statement, if any SQL_PLAN_BASELINE VARCHAR2(30) SQL plan baseline used for this statement, if any PROGRAM_ID NUMBER Program identifier PROGRAM_LINE# NUMBER Program line number EXACT_MATCHING_SIGNATURE NUMBER Signature calculated on the normalized SQL text. The normalization includes the removal of white space and the uppercasing of all non-literal strings. FORCE_MATCHING_SIGNATURE NUMBER Signature used when the CURSOR_SHARING parameter is set to FORCE LAST_ACTIVE_TIME DATE TIme at which the query plan was last active BIND_DATA RAW(2000) Bind data TYPECHECK_MEM NUMBER Typecheck memory IO_CELL_OFFLOAD_ELIGIBLE_BYTES NUMBER Number of I/O bytes which can be filtered by the Exadata storage system See Also: Oracle Exadata Storage Server Software documentation for more information

IO_INTERCONNECT_BYTES NUMBER Number of I/O bytes exchanged between Oracle Database and the storage system PHYSICAL_READ_REQUESTS NUMBER Number of physical read I/O requests issued by the monitored SQL PHYSICAL_READ_BYTES NUMBER Number of bytes read from disks by the monitored SQL PHYSICAL_WRITE_REQUESTS NUMBER Number of physical write I/O requests issued by the monitored SQL PHYSICAL_WRITE_BYTES NUMBER Number of bytes written to disks by the monitored SQL OPTIMIZED_PHY_READ_REQUESTS NUMBER Number of physical read I/O requests from Database Smart Flash Cache issued by the monitored SQL LOCKED_TOTAL NUMBER Total number of times the child cursor has been locked PINNED_TOTAL NUMBER Total number of times the child cursor has been pinned IO_CELL_UNCOMPRESSED_BYTES NUMBER Number of uncompressed bytes (that is, size after decompression) that are offloaded to the Exadata cells See Also: Oracle Exadata Storage Server Software documentation for more information

IO_CELL_OFFLOAD_RETURNED_BYTES NUMBER Number of bytes that are returned by Exadata cell through the regular I/O path See Also: Oracle Exadata Storage Server Software documentation for more information