If you have JDK 7 or later versions installed on your system and you want to restore Apple Java 6, then those JDK versions need to be uninstalled first. Operating system requirements: For Java 7 and later versions, you will need an Intel-based Mac running Mac OS X version 10.7.3 (Lion) and above.Installing Java on a Mac is performed on a system wide basis, for all users, and administrator privileges are required. Browser requirements: For Java versions 6 and below, Apple supplies their own version of Java.For Mac OS X 10.6 and below, use the Software Update feature (available on the Apple menu) to check that you have the most up-to-date version of Java 6 for your Mac.For issues related to Apple Java 6 on Mac, contact Apple Support.
VALUE(1000000,9999999)); r3 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); r4 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); r5 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); BEGIN CASE tbl WHEN 1 THEN UPDATE scale_write_1 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 2 THEN UPDATE scale_write_2 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 3 THEN UPDATE scale_write_3 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 4 THEN UPDATE scale_write_4 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 5 THEN UPDATE scale_write_5 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; ELSE NULL; END CASE; IF SQL%ROWCOUNT 0 THEN RETURN 'update all'; ELSE RETURN NULL; END IF; END; FUNCTION run_update_one(tbl IN NUMBER, d1 IN NUMBER) RETURN VARCHAR2 AS r NUMBER := CEIL(DBMS_RANDOM. 5 LOOP strt := systimestamp; := CASE cmd WHEN 0 THEN run_update_all(tbl, r cmd*q) WHEN 1 THEN run_insert (tbl, r cmd*q) WHEN 2 THEN run_update_one(tbl, r cmd*q) WHEN 3 THEN run_delete (tbl, r cmd*q) END; IF IS NOT NULL THEN COMMIT; -- magic: convert INTERVAL DAYS TO SECONDS -- to NUMERIC (seconds) tmp := sysdate; rec.seconds := tmp (systimestamp - strt)*86400 - tmp; rec.idxes := tbl; rec.id1 := r cmd*q; PIPE ROW(rec); END IF; END LOOP; END LOOP; iter := iter - 1; END LOOP; COMMIT; RETURN; END run; END test_write_scalability; Markus Winand teaches efficient SQL—inhouse and online.
UPDATE Table1 SET (…) WHERE Column1=’Some Value’IF @@ROWCOUNT=0 INSERT INTO Table1 VALUES (…) The saved table/index scan can increase performance quite a bit as the number of rows in the targeted table grows.
Just remember, the examples in the MSDN documentation are usually the easiest way to implement something, not necessarily the best way.
In most standard approaches, the following statement will likely provide better performance.
It will only perform one table/index scan instead of the two that are performed in the previous approach.