Updating inside an oracle

The JSON document tree based structure is only limited by VARCHAR2 (which is increased in 12c to 32KB). Working with JSON inside Database Good News The best advantage of using JSON inside Oracle is that we can select data inside JSON documents as if they were relational data.Based on JSON tree, we can prefix “.” To go down the JSON path hierarchy: We can also join data inside JSON tree with other Oracle tables. In 12c Release 2, if table is set IN MEMORY, then JSON document is transformed in a binary format in memory (instead of text) for high performance.So called scalar subquery caching, which works with all DB versions. Or you take a look at the DETERMINISTIC clause which can specified when creating a function or a package functions. It’s a hint for the optimizer to indicate that the function returns the same result value whenever it is called with the same values for its arguments.

updating inside an oracle-21

Data Density The first thing to notice is that once we insert JSON documents in VARCHAR2/CLOB columns, the data density inside the database increases.

It is basically like having nested tables, which more details inside each row.

COUNT LOOP uw_selection(i).part_num := uw_selection(i).part_num * 10; END LOOP; FORALL i IN 1..uw_selection. ERROR_CODE; sd := TRUNC(l_data(SQL%BULK_EXCEPTIONS(j). ERROR_INDEX).sub_date); cai := l_data(SQL%BULK_EXCEPTIONS(j). ERROR_INDEX).cust_account_id; cid := l_data(SQL%BULK_EXCEPTIONS(j). ERROR_INDEX).carrier_id; tid := l_data(SQL%BULK_EXCEPTIONS(j). ERROR_INDEX).ticket_id; INSERT INTO load_errors (error_code, sub_date, cust_account_id, carrier_id, ticket_id) VALUES (ecode, sd, cai, cid, tid); END LOOP; FOR le_rec IN le_cur LOOP IF le_rec.error_code = 1 THEN SELECT upd_date INTO iud FROM test WHERE cust_account_id = le_rec.cust_account_id AND carrier_id = le_rec.carrier_id AND ticket_id = le_rec.ticket_id; IF iud IS NULL THEN RAISE; ELSIF iud CREATE TABLE t1 (pnum INTEGER, pname VARCHAR2(15)); CREATE TABLE t2 AS SELECT * FROM t1; CREATE OR REPLACE PROCEDURE perf_compare(iterations PLS_INTEGER) AUTHID CURRENT_USER IS TYPE Num Tab IS TABLE OF t1.pnum%TYPE INDEX BY PLS_INTEGER; TYPE Name Tab IS TABLE OF t1.pname%TYPE INDEX BY PLS_INTEGER; pnums Num Tab; pnames Name Tab; a INTEGER; b INTEGER; c INTEGER; BEGIN FOR j IN 1..iterations LOOP -- use FORALL statement INSERT INTO t2 VALUES (pnums(i), pnames(i)); c := dbms_utility.get_time; dbms_output.put_line('Execution Time (secs)'); dbms_output.put_line('---------------------'); dbms_output.put_line('FOR loop: ' || TO_CHAR((b - a)/100)); dbms_output.put_line('FORALL: ' || TO_CHAR((c - b)/100)); COMMIT; END perf_compare; / set serveroutput on exec perf_compare(500); exec perf_compare(5000); exec perf_compare(50000); DECLARE k parent.part_name%TYPE := 'Transducer'; BEGIN FOR i IN 1 ..

COUNT INSERT INTO child VALUES (uw_selection(i).part_num, uw_selection(i).part_name); COMMIT; END fast_way; /; l_last_ddl_time dbms_sql. 200000 LOOP SELECT DECODE(k, 'Transducer', 'Rectifier', 'Rectifier', 'Capacitor', 'Capacitor', 'Knob', 'Knob', 'Chassis', 'Chassis', 'Transducer') INTO k FROM dual; INSERT INTO parent VALUES (i, k); END LOOP; COMMIT; END; / SELECT COUNT(*) FROM parent; SELECT COUNT(*) FROM child; CREATE OR REPLACE PROCEDURE fast_way AUTHID CURRENT_USER IS TYPE Part Num IS TABLE OF parent.part_num%TYPE INDEX BY BINARY_INTEGER; pnum_t Part Num; TYPE Part Name IS TABLE OF parent.part_name%TYPE INDEX BY BINARY_INTEGER; pnam_t Part Name; BEGIN SELECT part_num, part_name BULK COLLECT INTO pnum_t, pnam_t FROM parent; FORALL i IN 1 .. COUNT INSERT INTO child (part_num, part_name) VALUES (p_rec.part_num(i), p_rec.part_name(i)); EXIT WHEN (l_done); END LOOP; COMMIT; CLOSE c; END fast_way; / set timing on exec fast_way -- 0.51TRUNCATE TABLE child; set timing on exec slow_way; exec fast_way; set timing off TRUNCATE TABLE child; CREATE OR REPLACE TRIGGER bi_child BEFORE INSERT ON child FOR EACH ROW BEGIN NULL; END bi_child; / set timing on exec slow_way; CREATE OR REPLACE PROCEDURE fast_way AUTHID CURRENT_USER IS TYPE myarray IS TABLE OF parent%ROWTYPE; l_data myarray; CURSOR r IS SELECT part_num, part_name FROM parent; BEGIN OPEN r; LOOP FETCH r BULK COLLECT INTO l_data LIMIT 1000; FOR j IN 1 .. COUNT LOOP l_data(j).part_num := l_data(j).part_num * 10; END LOOP; CREATE TABLE tsource AS SELECT * FROM dba_tables; INSERT INTO tsource SELECT * FROM tsource WHERE table_name = 'DUAL'; SELECT COUNT(*) FROM tsource; SELECT table_name, COUNT(*) FROM tsource GROUP BY table_name HAVING COUNT(*) 1; CREATE TABLE ttarget AS SELECT * FROM tsource WHERE 1=2; ALTER TABLE ttarget ADD CONSTRAINT pk_ttarget PRIMARY KEY (table_name); CREATE OR REPLACE PROCEDURE old_way AUTHID DEFINER IS BEGIN FOR orec IN (SELECT * FROM tsource) LOOP INSERT INTO ttarget VALUES orec; END LOOP; COMMIT; END old_way; / CREATE OR REPLACE PROCEDURE old_way AUTHID DEFINER IS BEGIN FOR orec IN (SELECT * FROM tsource) LOOP BEGIN INSERT INTO ttarget VALUES orec; EXCEPTION WHEN OTHERS THEN NULL; END; END LOOP; COMMIT; END old_way; / exec old_way; exec old_way; exec old_way; exec old_way; TRUNCATE TABLE ttarget; CREATE OR REPLACE PROCEDURE new_way AUTHID DEFINER IS TYPE myarray IS TABLE OF tsource%ROWTYPE; l_data myarray; CURSOR ocur IS SELECT CREATE TABLE airplanes2 AS SELECT * FROM airplanes WHERE 1=2; DECLARE TYPE myarray IS TABLE OF airplanes2%ROWTYPE; l_data myarray; CURSOR r IS SELECT * FROM airplanes; Batch Size CONSTANT POSITIVE := 1000; BEGIN OPEN r; LOOP FETCH r BULK COLLECT INTO l_data LIMIT Batch Size; FORALL i IN 1..l_data.

Are you using the V or NV function in your SQL statements?

In APEX 2.0 the V function isn’t wrapped (in 2.2 it is) and I don’t see that the DETERMINISTIC is used in the code…

It’s just memory processing they do in there, but if you call it for 1.000’s of records…

It used to be that you could not BULK COLLECT into an ARRAY OF RECORDS but that you could into a RECORD OF ARRAYS, as above. = 'Rectifier' THEN v_part.delete(rec); END IF; END LOOP; FORALL idx CREATE TABLE valid_orders ( cust_name VARCHAR2(32), amount NUMBER(10,2)); CREATE TABLE big_orders AS SELECT * FROM valid_orders WHERE 1 = 0; CREATE TABLE rejected_orders AS SELECT * FROM valid_orders WHERE 1 = 0; DECLARE SUBTYPE cust_name IS valid_orders.cust_name%TYPE; TYPE cust_typ IS TABLe OF cust_name; cust_tab cust_typ; SUBTYPE order_amount IS valid_orders.amount%TYPE; TYPE amount_typ IS TABLE OF NUMBER; amount_tab amount_typ; cust_tab := cust_typ('Company1', 'Company2', 'Company3', 'Company4', 'Company5'); amount_tab := amount_typ(5000.01, 0, 150.25, 4000.00, NULL); END setup_data; BEGIN setup_data; dbms_output.put_line('--- Original order data ---'); FOR i IN 1..cust_tab.

It’s just a hint for the optimizer during execution of the current statement.

if your function is changing some global variables (eg increase a counter) or doing DML and you expect that the function is called for each row!

It’s just called as often as there are different salaries in the table.


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