COLLECT → Syntax collect::= Description of the illustration collect.gif Purpose COLLECT takes as its argument … collection, then the output of COLLECT is a nested table of collections. See Also: CAST Examples The … oe.customers: CREATE TYPE phone_book_t AS TABLE OF phone_list_typ; / SELECT CAST(COLLECT(phone_numbers) AS phone_book_t)
Restrictions on BULK COLLECT → following restrictions apply to the BULK COLLECT clause: You cannot bulk collect into an associative array … that has a string type for the key. You can use the BULK COLLECT clause only in server-side … client-side programs. All target variables listed in a BULK COLLECT INTO clause must be collections … , multiple
Creating Database Tables to Collect DBMS_TRACE Output → You must create database tables into which the DBMS_TRACE package writes output. Otherwise, the data is not collected. To create these tables, run the script TRACETAB.SQL. The tables this script creates are owned by SYS.
Selecting Multiple Rows: BULK COLLECT Clause → through a result set one row at a time, you can use the BULK COLLECT clause. When you query only certain … employee_id, last_name, salary FROM employees BULK COLLECT INTO all_employee_ids, all_last_names … columns: SELECT * FROM employees BULK COLLECT INTO all_employees; FOR i IN all_employees.FIRST
7.7.3 Should I collect statistics on my tables? → Answer: Yes. Collecting statistics on your tables enables Oracle Text to do cost-based analysis. This helps Oracle Text choose the most efficient execution plan for your queries. See Also: "Optimizing Queries with Statistics" in this chapter.
Using DBMS_STATS to Collect Table and Index Statistics → gathering optimizer statistics, but you must use the ANALYZE statement to collect statistics unrelated
Retrieving Query Results into Collections with the BULK COLLECT Clause → Using the keywords BULK COLLECT with a query is a very efficient way to retrieve the result set … INTO clause. With the BULK COLLECT clause, all the variables in the INTO list must be collections … , last_name -- Retrieve data for 10 arbitrary employees. BULK COLLECT INTO enums, names FROM employees … elements. Since the processing
Reducing Loop Overhead for DML Statements and Queries (FORALL, BULK COLLECT) → COLLECT clause brings back batches of results from SQL. If the DML statement affects four or more … FORALL statement instead of a loop construct. To speed up SELECT statements, include the BULK COLLECT
ORA-23345: table " string "." string " not registered to collect statistics → conflict. Action: Register a named constraint for the specified table. ORA-23345: table " string "." string " not registered to collect statistics
ORA-09834: snyGetPortSet: failed to collect info on a port. → Oracle support. ORA-09834: snyGetPortSet: failed to collect info on a port.
PLS-00432: implementation restriction: cannot use FORALL and BULK COLLECT INTO together in SELECT statements → integer datatype. PLS-00432: implementation restriction: cannot use FORALL and BULK COLLECT INTO together in SELECT statements
ORA-22957: NULL is an invalid input to powermultiset and COLLECT functions → as input ORA-22957: NULL is an invalid input to powermultiset and COLLECT functions
SELECT_WORKLOAD_REPOSITORY Functions → : Collect SQL statements from all snapshots between begin_snap and end_snap. Collect SQL statements from a workload repository baseline.
Usage Notes → Use this procedure to collect nonoptimizer statistics. For optimizer statistics, use the DBMS_STATS. GATHER_TABLE_STATS or DBMS_STATS. GATHER_INDEX_STATS procedure.
Operational Notes → Controlling Data Volume Creating Database Tables to Collect DBMS_TRACE Output Collecting Trace Data Collected Data Trace Control
Exceptions → schema does not exist. missingobject Specified table does not exist. statnotreg Table not registered to collect statistics.
18.4.3 COLLECTION RESET → SQL [AT [:]database] COLLECTION RESET:collect [ [INDICATOR]:collect_ind]. Variables collect (IN/OUT
SET CONNECTION_STATISTICS → Purpose Use the SET CONNECTION_STATISTICS command to specify whether gateway processes collect … ]: Specify to have gateway processes collect connection statistics [no]: (Default) Specify that gateway … processes not collect connection statistics Usage Notes If SET CONNECTION_STATISTICS is set to yes
Exceptions → schema does not exist. missingobject Specified table does not exist. statnotreg Specified table is not currently registered to collect statistics.
Examples of Dynamic Bulk Binds → Example 7-5 Dynamic SQL with BULK COLLECT INTO Clause You can bind define variables in a dynamic … query using the BULK COLLECT INTO clause. As the following example shows, you can use that clause in a … COLLECT INTO empnos, enames; CLOSE emp_cv; EXECUTE IMMEDIATE 'SELECT sal FROM emp' BULK COLLECT INTO … sals;