I'm trying to load some test data into table t1 by calling 2 functions but I can't seem to get the INSERT and CONNECT by to work.
Any help would be greatly appreciated.
ALTER SESSION SET NLS_TIMESTAMP_FORMAT = 'DD-MON-YYYY HH24:MI:SS.FF';
ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';
CREATE OR REPLACE FUNCTION random_date(
p_from IN DATE,
p_to IN DATE
) RETURN DATE
IS
BEGIN
RETURN p_from + DBMS_RANDOM.VALUE() * (p_to -p_from);
END random_date;
/
CREATE OR REPLACE FUNCTION random_timestamp(
p_from IN TIMESTAMP,
p_to IN TIMESTAMP
) RETURN TIMESTAMP
IS
BEGIN
RETURN p_from + DBMS_RANDOM.VALUE() * (p_to -p_from);
END random_timestamp;
/
CREATE TABLE t1 (
seq_num NUMBER GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,
dt DATE,
ts TIMESTAMP
);
INSERT into t1 (dt, ts) VALUES
random_date (DATE'2022-04-01',DATE '2022-04-30'),
random_timestamp (DATE'2022-04-01',DATE '2022-04-30')
CONNECT BY LEVEL<=1000;
Not values, but select from dual (didn't insert 1000 rows; 10 will suffice; also, SEQ_NUM values don't start from 1 as I ran that code several times, but that's irrelevant):
SQL> INSERT INTO t1 (
2 dt,
3 ts
4 )
5 SELECT
6 random_date(DATE '2022-04-01', DATE '2022-04-30'),
7 random_timestamp(DATE '2022-04-01', DATE '2022-04-30')
8 FROM
9 dual
10 CONNECT BY
11 level <= 10;
10 rows created.
Result:
SQL> select * From t1;
SEQ_NUM DT TS
---------- -------------------- ------------------------------
41 03-APR-2022 00:36:33 05-APR-2022 03:38:39.215073
42 22-APR-2022 15:29:50 26-APR-2022 23:44:20.687417
43 27-APR-2022 23:42:49 29-APR-2022 23:54:17.692053
44 21-APR-2022 19:24:10 22-APR-2022 23:07:20.602254
45 13-APR-2022 20:45:39 04-APR-2022 04:05:08.815214
46 07-APR-2022 09:35:37 07-APR-2022 21:32:28.443624
47 23-APR-2022 11:48:18 18-APR-2022 06:40:39.608578
48 22-APR-2022 23:53:04 02-APR-2022 13:13:54.285010
49 14-APR-2022 21:35:57 10-APR-2022 12:26:08.419025
50 11-APR-2022 21:49:32 10-APR-2022 17:20:45.033907
SQL>
Related
My apologies for the verbose post but the setup is necessary to show my problem and ask a question.
In the anonymous block below I'm trying to construct a string, which encapsulates the table in a single quote ie 'T1' but I've been struggling for the past hour and can use some help.
Secondly, I purposely left out a row in the table partition_rention for table name T2. I suspect a NULL will be returned into the variable when the statement is executed. Will this work?
if v_days is NULL
then
v_days := 30
END IF;
Thanks in advance to all who answer and your expertise
create table partition_rention
(
TABLE_NAME VARCHAR2(30) NOT NULL,
DAYS NUMBER(6),
CONSTRAINT Check_gt0
CHECK (DAYS> 0)
);
/
INSERT into partition_rention (TABLE_NAME, DAYS)
VALUES
('T1', 15);
/
INSERT into partition_rention (TABLE_NAME, DAYS)
VALUES
('T3', 15);
/
CREATE TABLE t1 (
seq_num NUMBER GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,
dt DATE
)
PARTITION BY RANGE (dt)
INTERVAL (NUMTODSINTERVAL(7,'DAY'))
(
PARTITION OLD_DATA values LESS THAN (TO_DATE('2022-01-01','YYYY-MM-DD'))
);
/
INSERT /*+ APPEND */ into t1 (dt)
with dt (dt, interv) as (
select date '2022-01-01', numtodsinterval(30,'MINUTE') from dual
union all
select dt.dt + interv, interv from dt
where dt.dt + interv < date '2022-01-15')
select dt from dt;
/
create index ix_local on t1 (dt) local;
/
CREATE TABLE t2
(
seq_num NUMBER GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,
dt DATE
)
PARTITION BY RANGE (dt)
INTERVAL (NUMTODSINTERVAL(1,'DAY'))
(
PARTITION OLD_DATA values LESS THAN (TO_DATE('2022-01-01','YYYY-MM-DD'))
);
/
INSERT /*+ APPEND */ into t2 (dt)
with dt (dt, interv) as (
select date '2022-01-01', numtodsinterval(30,'MINUTE') from dual
union all
select dt.dt + interv, interv from dt
where dt.dt + interv < date '2022-01-15')
select dt from dt;
/
create index ix_global on t2 (dt);
/
CREATE TABLE t3 (
seq_num NUMBER GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,
dt TIMESTAMP)
PARTITION BY RANGE (dt)
INTERVAL ( NUMTODSINTERVAL (1, 'DAY') ) (
PARTITION OLD_DATA VALUES LESS THAN (TIMESTAMP '2022-01-01 00:00:00.000000')
);
/
INSERT /*+ APPEND */ into t3 (dt)
SELECT TIMESTAMP '2022-01-01 00:00:00'
+ (LEVEL - 1) * INTERVAL '5' MINUTE
+ MOD(LEVEL - 1, 10) * INTERVAL '0.1' SECOND
FROM DUAL
CONNECT BY
TIMESTAMP '2022-01-01 00:00:00'
+ (LEVEL - 1) * INTERVAL '5' MINUTE
+ MOD(LEVEL - 1, 10) * INTERVAL '0.1' SECOND < DATE '2022-01-15';
/
DECLARE
v_str VARCHAR2 (500);
v_days NUMBER := 0;
BEGIN
FOR cur_r IN(
SELECT TABLE_NAME, PARTITIONING_TYPE, COLUMN_NAME, DATA_TYPE
FROM USER_PART_TABLES
JOIN USER_PART_KEY_COLUMNS ON NAME = TABLE_NAME
JOIN USER_TAB_COLS USING (TABLE_NAME, COLUMN_NAME)
where OBJECT_TYPE = 'TABLE' AND
PARTITIONING_TYPE='RANGE' AND
regexp_like(DATA_TYPE,'^DATE$|^TIMESTAMP*')
)
LOOP
--DBMS_OUTPUT.put_line('Table '|| cur_r.table_name);
v_str := 'select DAYS FROM partition_rention into v_days where TABLE_NAME = '||cur_r.table_name||'';
DBMS_OUTPUT.put_line(v_str);
-- execute immediate v_str;
END LOOP;
END;
Statement processed.
select DAYS FROM partition_rention into v_days where TABLE_NAME = T1
select DAYS FROM partition_rention into v_days where TABLE_NAME = T2
select DAYS FROM partition_rention into v_days where TABLE_NAME = T3
There is no reason for dynamic SQL. It would be this:
begin
select DAYS
into v_days
FROM partition_rention
where TABLE_NAME = cur_r.table_name;
exception
when NO_DATA_FOUND THEN
v_days := 30;
end;
If you really insist for dynamic SQL then it would be this one
begin
v_str := 'select DAYS FROM partition_rention where TABLE_NAME = :t';
execute immediate v_str into v_days using cur_r.table_name;
exception
when NO_DATA_FOUND THEN
v_days := 30;
end;
NB, I guess the next step might be to drop outdated partitions. For this have a look at How to drop multiple interval partitions based on date?
If the LOOP statement comes between a BEGIN statement and its matching EXCEPTION or END; then the END LOOP statement has to come between them as well. If i want an EXCEPTION handler that catches errors that may occur within the loop, and then continues the loop then the exception handler doesn't appear to work.
The code was restructured to remove the expectation handler.
I already have a query that finds the tables and columns I'm interested in. Now, for each table in that result set, I want to get the matching days value from the partition_retention table if there is one, and if there is no matching row in partition_retention, I want the table_name anyway with a default value (30) for days. To do this I implemented an outer JOIN like this:
BEGIN
FOR td IN
(
SELECT table_name
, NVL (pr.days, 30) AS days
FROM user_part_tables pt
JOIN user_part_key_columns pkc ON pkc.name = pt.table_name
JOIN user_tab_cols tc USING (table_name, column_name)
LEFT JOIN partition_retention pr USING (table_name)
WHERE pkc.object_type = 'TABLE'
AND pt.partitioning_type = 'RANGE'
AND REGEXP_LIKE (tc.data_type, '^DATE$|^TIMESTAMP*')
ORDER BY table_name -- not needed, but could be handy in debugging
)
LOOP
-- For debugging:
dbms_output.put_line ( td.table_name
|| ' = table_name, '
|| TO_CHAR (td.days)
|| ' = days'
);
-- call procedure to remove old PARTITIONs here.
END LOOP;
END;
/
Output from my sample data:
T1 = table_name, 15 = days
T2 = table_name, 30 = days
T3 = table_name, 5 = days
I have a date range, I am trying to take one date every week through a loop
DECLARE
start_date DATE := TO_DATE('06.01.2021', 'dd.MM.yyyy');
end_date DATE := TO_DATE('26.05.2021', 'dd.mm.yyyy');
active_date DATE;
start_number NUMBER;
end_number NUMBER;
BEGIN
start_number := TO_NUMBER(TO_CHAR(start_date, 'j'));
end_number := TO_NUMBER(TO_CHAR(end_date, 'j'));
active_date := start_date;
FOR cur_r IN start_number..end_number
LOOP
INSERT INTO test_tbl
SELECT snap_date FROM s_act
WHERE
snap_date = active_date;
active_date := TRUNC(active_date) + 7;
COMMIT;
END LOOP;
END;
When I execute this script, only one date 06.01.2021 is written to the table through all iterations.
Where am I making a mistake? How can this be fixed?
You do not need PL/SQL for this and can just use a recursive sub-query:
INSERT INTO test_tbl
WITH date_range ( start_date, end_date ) AS (
SELECT DATE '2021-01-06', DATE '2021-05-26' FROM DUAL
UNION ALL
SELECT start_date + INTERVAL '7' DAY,
end_date
FROM date_range
WHERE start_date + INTERVAL '7' DAY <= end_date
)
SELECT snap_date
FROM s_act s
WHERE EXISTS(
SELECT 1
FROM date_range r
WHERE r.start_date = s.snap_date
);
or a hierarchical query:
INSERT INTO test_tbl
SELECT snap_date
FROM s_act s
WHERE EXISTS(
WITH date_range ( start_date, end_date ) AS (
SELECT DATE '2021-01-06', DATE '2021-05-26' FROM DUAL
)
SELECT 1
FROM date_range r
WHERE r.start_date + ( LEVEL - 1 ) * INTERVAL '7' DAY = s.snap_date
CONNECT BY r.start_date + ( LEVEL - 1 ) * INTERVAL '7' DAY <= r.end_date
);
If you really want to use PL/SQL then you can make it much simpler and iterate by weeks rather than days (however, this will be much less efficient as you will have one INSERT per week and the associated context switch from PL/SQL to SQL compared to the SQL solution which is only a single INSERT for the entire operation and no context switches):
DECLARE
start_date DATE := DATE '2021-01-06';
end_date DATE := DATE '2021-05-26';
active_date DATE := start_date;
BEGIN
LOOP
EXIT WHEN active_date > end_date;
INSERT INTO test_tbl
SELECT snap_date FROM s_act
WHERE snap_date = active_date;
active_date := active_date + INTERVAL '7' DAY;
END LOOP;
END;
/
db<>fiddle here
To me, it looks as if everything is, actually, OK with code you wrote, because active_date gets its new value:
SQL> set serveroutput on;
SQL> declare
2 start_date date := to_date('06.01.2021', 'dd.MM.yyyy');
3 end_date date := to_date('26.05.2021', 'dd.mm.yyyy');
4 active_date date;
5 start_number number;
6 end_number number;
7 begin
8 start_number := to_number(to_char(start_date, 'j'));
9 end_number := to_number(to_char(end_date, 'j'));
10 active_date := start_date;
11
12 for cur_r in start_number..end_number
13 loop
14 dbms_output.put_line('Active_date = ' || to_char(active_date, 'dd.mm.yyyy'));
15 /* Commented, as I don't have your tables nor data
16 INSERT INTO test_tbl
17 SELECT snap_date
18 FROM s_act
19 WHERE snap_date = active_date;
20 */
21 active_date := trunc(active_date) + 7;
22 end loop;
23 -- move COMMIT out of the loop!
24 commit;
25 end;
26 /
Active_date = 06.01.2021
Active_date = 13.01.2021
Active_date = 20.01.2021
<snip>
Active_date = 06.09.2023
Active_date = 13.09.2023
PL/SQL procedure successfully completed.
SQL>
You said
When I execute this script, only one date 06.01.2021 is written to the table through all iterations.
This is piece of code responsible for that:
INSERT INTO test_tbl
SELECT snap_date
FROM s_act
WHERE snap_date = active_date;
I interpret it as:
s_act table contains rows only with snap_date equal to 06.01.2021, or
if it contains rows with other dates, maybe they contain a time component (hours, minutes, seconds) and where condition prevents them to be inserted. If that's so, try with
where trunc(snap_date) = active_date
and see what happens.
Example scenario:
5 tables are there and one common field among them is com_field (DATE data type). Now, I need to find the maximum of com_field in each of the five tables. Can someone give the logic?
I know UNION could be used but I need the flexibility not to miss any new table added to the OWNER.
The result I am expecting is like the below.
Table Max(com_field)
Tbl1 10/21/2019
Tbl2 10/18/2019
Tbl3 10/28/2019
Tbl4 09/30/2019
Tbl5 09/09/2019
Run this query:
SELECT
'SELECT '''||OWNER||'.'||TABLE_NAME ||''' AS TABLE_NAME , '||'MAX(COM_FIELD)AS COM_FIELD FROM ' ||OWNER||'.'||TABLE_NAME ||' UNION ALL'
FROM ALL_TAB_COLUMNS
WHERE COLUMN_NAME ='COM_FIELD'
then copy the outpu and delete last union all keyword. Then run the sql statement.
You can order it and see the max value
One option is to use dynamic SQL in a function that returns refcursor. Here's an example.
First, test case:
SQL> create table taba (com_field date);
Table created.
SQL> create table tabb (com_field date);
Table created.
SQL> create table tabc (com_field date);
Table created.
SQL> insert all
2 into taba values (sysdate)
3 into taba values (sysdate - 2)
4 into taba values (sysdate - 3)
5 into tabb values (sysdate + 2)
6 into tabc values (sysdate + 4)
7 into tabc values (sysdate + 5)
8 select * From dual;
6 rows created.
SQL>
Function:
SQL> create or replace function f_maxcom
2 return sys_refcursor
3 is
4 l_str varchar2(1000);
5 rc sys_refcursor;
6 begin
7 for cur_r in (select table_name
8 from user_tab_columns
9 where column_name = 'COM_FIELD'
10 )
11 loop
12 l_str := l_str ||
13 'select ' || chr(39) || cur_r.table_name || chr(39) || ', ' ||
14 'max(com_field) from ' || cur_r.table_name || ' union all ';
15 end loop;
16
17 l_str := rtrim(l_str, ' union all');
18
19 open rc for l_str;
20 return rc;
21 end;
22 /
Function created.
SQL>
Let's try it:
SQL> select f_maxcom from dual;
F_MAXCOM
--------------------
CURSOR STATEMENT : 1
CURSOR STATEMENT : 1
'TAB MAX(COM_FI
---- ----------
TABA 29.10.2019
TABB 31.10.2019
TABC 03.11.2019
SQL>
Add another table to see what happens; function will stay as is:
SQL> create table littlefoot (id number, com_field date);
Table created.
SQL> insert into littlefoot values (100, sysdate);
1 row created.
SQL> select f_maxcom from dual;
F_MAXCOM
--------------------
CURSOR STATEMENT : 1
CURSOR STATEMENT : 1
'LITTLEFOO MAX(COM_FI
---------- ----------
LITTLEFOOT 29.10.2019
TABA 29.10.2019
TABB 31.10.2019
TABC 03.11.2019
SQL>
Seems to be OK, eh?
I am trying to get all the new values and old values in trigger before inserting it to another table but i could just get the specific value not the all the data.
I tried with :NEW.* and :OLD.* it works fine for postgress but not for oracle.
CREATE OR REPLACE TRIGGER trg_customer_tbl_ib01
BEFORE INSERT OR UPDATE OR DELETE ON TEST.customer_test
FOR EACH ROW
DECLARE
vAction VARCHAR2(4000) := null;
vFound INT := null;
vREC TEST.CUSTOMER_TEST%ROWTYPE;
BEGIN
IF INSERTING OR UPDATING THEN
select :NEW.* into vREC FROM DUAL;
ELSIF DELETING THEN
select :OLD.* into vREC FROM DUAL;
END IF;
IF DELETING THEN
INSERT INTO TEST.CUSTOMER_TEST_AUDIT SELECT
CUSTOMER_TEST_AUDIT_id_seq.NEXTVAL,'D',SYSDATE, vREC.* FROM DUAL;
ELSIF UPDATING THEN
INSERT INTO TEST.CUSTOMER_TEST_AUDIT SELECT
CUSTOMER_TEST_AUDIT_id_seq.NEXTVAL,'U',SYSDATE, vREC.*FROM DUAL;
ELSIF INSERTING THEN
INSERT INTO TEST.CUSTOMER_TEST_AUDIT SELECT
CUSTOMER_TEST_AUDIT_id_seq.NEXTVAL,'I',SYSDATE, vREC.* FROM DUAL;
END IF;
END;
I am getting error :
Error(10,8): PLS-00049: bad bind variable 'NEW.'
Well, don't be impatient. Don't use shortcuts.
Test case:
SQL> create table test as select * From dept;
Table created.
SQL> create table test_log as select * From dept where 1 = 2;
Table created.
SQL> alter table test_log add (id number, action varchar2(1), datum date);
Table altered.
SQL> create sequence seqlog;
Sequence created.
SQL>
Trigger. Reference each column separately. The fact that :NEW.* works in Postgres doesn't mean it works in Oracle.
SQL> create or replace trigger trg_test
2 before insert or update or delete on test
3 for each row
4 begin
5 if updating then
6 insert into test_log (deptno, dname, loc, id, action, datum)
7 values
8 (:old.deptno, :old.dname, :old.loc, seqlog.nextval, 'U', sysdate);
9 insert into test_log (deptno, dname, loc, id, action, datum)
10 values
11 (:new.deptno, :new.dname, :new.loc, seqlog.nextval, 'U', sysdate);
12 elsif inserting then
13 insert into test_log (deptno, dname, loc, id, action, datum)
14 values
15 (:new.deptno, :new.dname, :new.loc, seqlog.nextval, 'I', sysdate);
16 elsif deleting then
17 insert into test_log (deptno, dname, loc, id, action, datum)
18 values
19 (:old.deptno, :old.dname, :old.loc, seqlog.nextval, 'D', sysdate);
20 end if;
21 end;
22 /
Trigger created.
SQL>
Testing:
SQL> alter session set nls_Date_format = 'dd.mm.yyyy hh24:mi:ss';
Session altered.
SQL> update test set loc = 'Croatia' where deptno = 10;
1 row updated.
SQL> delete from test where deptno = 20;
1 row deleted.
SQL> insert into test (deptno, dname, loc) values (99, 'IT', 'Zagreb');
1 row created.
SQL> select * From test_log order by id;
DEPTNO DNAME LOC ID A DATUM
---------- -------------- ------------- ---------- - -------------------
10 ACCOUNTING NEW YORK 5 U 20.05.2019 21:44:33
10 ACCOUNTING Croatia 6 U 20.05.2019 21:44:33
20 RESEARCH DALLAS 7 D 20.05.2019 21:44:43
99 IT Zagreb 8 I 20.05.2019 21:44:52
SQL>
Oracle : 11.2.0.2
I'm trying to drop monthy and daily partitions using a script. This works fine for monthly partitions but not for daily partitions. Below is the error I see in the log. Day of the month is becoming zero when calculating.
2013-08-0|SYS_P328538|2|YES
DECLARE
*
ERROR at line 1:
ORA-01847: day of month must be between 1 and last day of month
ORA-06512: at line 43
Here below is the script. I think highvalue date is miscalculated.
SQL> DECLARE
2 CURSOR tab_part_cur IS
3 select PARTITION_POSITION, PARTITION_NAME,HIGH_VALUE,INTERVAL from dba_tab_partitions where table_name = 'MO_USAGEDATA'
and table_owner = 'WSMUSER17'
order by PARTITION_POSITION;
4 tab_part_rec tab_part_cur%ROWTYPE;
5 lHighValue LONG;
6 strPartitionLessThanDate VARCHAR2(100);
7 dtTestDate DATE;
8 DaysInPast NUMBER;
9 SQLstr varchar2(100);
10 strIntervalType varchar2(1000);
11 strRunType varchar2(20);
12 BEGIN
13 strRunType := 'DRY_RUN';
14 select INTERVAL into strIntervalType from dba_part_tables where table_name ='MO_USAGEDATA' and owner = 'WSMUSER17';
15 strIntervalType := REGEXP_SUBSTR(strIntervalType, '''[^'']+''');
16 DBMS_OUTPUT.PUT_LINE(strIntervalType);
17 CASE
18 WHEN strIntervalType = '''DAY''' THEN
19 DBMS_OUTPUT.PUT_LINE('Interval type = '||strIntervalType);
20 -- dtTestDate := CURRENT_DATE - 7 - 1; Offset adjustment if necessary
21 dtTestDate := CURRENT_DATE - 7;
22 DBMS_OUTPUT.PUT_LINE('Test Date = '||dtTestDate);
23 WHEN strIntervalType = '''MONTH''' THEN
24 DBMS_OUTPUT.PUT_LINE('Interval type = '||strIntervalType);
25 -- dtTestDate := CURRENT_DATE - 90;
26 dtTestDate := ADD_MONTHS(current_date,- 7);
27 DBMS_OUTPUT.PUT_LINE('TestDate = '||dtTestDate);
28 ELSE
29 DBMS_OUTPUT.PUT_LINE('Unexpected interval, exiting.');
30 GOTO EXIT;
31 END CASE;
32 OPEN tab_part_cur;
33 LOOP
34 FETCH tab_part_cur INTO tab_part_rec;
35 EXIT WHEN tab_part_cur%NOTFOUND;
36 DBMS_OUTPUT.PUT_LINE(tab_part_cur%ROWCOUNT);
37 lHighValue := tab_part_rec.high_value;
38 /* This next line seems redundant but is needed for conversion quirk from LONG to VARCHAR2
39 */
40 strPartitionLessThanDate := lHighValue;
41 strPartitionLessThanDate := substr(strPartitionLessThanDate, 11, 10);
42 DBMS_OUTPUT.PUT_LINE(strPartitionLessThanDate ||'|'|| tab_part_rec.partition_name ||'|'|| tab_part_rec.partition_position ||'|'|| tab_part_rec.interval);
43 DBMS_OUTPUT.PUT_LINE(TO_DATE(strPartitionLessThanDate, 'YYYY-MM-DD') ||'******'||dtTestDate);
44 IF TO_DATE(strPartitionLessThanDate, 'YYYY-MM-DD') < dtTestDate AND tab_part_rec.partition_name <> 'PART_MINVALUE
' THEN
45 SQLstr := 'ALTER TABLE WSMUSER17.MO_USAGEDATA DROP PARTITION '||tab_part_rec.partition_name ||' update Global indexes';
46 DBMS_OUTPUT.PUT_LINE('Targeted Partition !!!!!!!!');
47 IF strRunType = 'LIVE_RUN' THEN
48 DBMS_OUTPUT.PUT_LINE('Dropping Partition !!!!!!!!');
49 execute immediate SQLstr;
50 END IF;
51 END IF;
52 END LOOP;
53 CLOSE tab_part_cur;
54 << EXIT >>
55 DBMS_OUTPUT.PUT_LINE('Partition purge complete');
56 END;
57 /
'DAY'
Interval type = 'DAY'
Test Date = 03-SEP-13
1
2012-06-1|PART_MINVALUE|1|NO
01-JUN-12******03-SEP-13
2
2013-08-0|SYS_P328538|2|YES
DECLARE
*
ERROR at line 1:
ORA-01847: day of month must be between 1 and last day of month
ORA-06512: at line 43
I'm trying to keep lat 7 partitions in the daily partitioned table and drop the rest of the partitions. But its not dropping them.
Ok, I created the table, inserted some data and ran some of your queries and you've got something wrong with your substring:
SQL> CREATE TABLE "MO_USAGEDATA" (
2 "REQUESTDTS" TIMESTAMP (9) NOT NULL ENABLE
3 )
4 partition by range ("REQUESTDTS") INTERVAL(NUMTODSINTERVAL(1,'DAY'))
5 (partition PART_MINVALUE values less than(TIMESTAMP '2012-06-18 00:00:00'));
Table created
SQL> INSERT INTO MO_USAGEDATA
2 (SELECT SYSDATE + ROWNUM FROM dual CONNECT BY LEVEL <= 30);
30 rows inserted
SQL> SELECT high_value, INTERVAL
2 FROM all_tab_partitions
3 WHERE table_name = 'MO_USAGEDATA'
4 AND table_owner = USER
5 ORDER BY PARTITION_POSITION;
HIGH_VALUE INTERVAL
------------------------------------ ---------
[...]
TIMESTAMP' 2013-09-30 00:00:00' YES
TIMESTAMP' 2013-10-01 00:00:00' YES
TIMESTAMP' 2013-10-02 00:00:00' YES
[...]
SQL> SELECT substr('TIMESTAMP'' 2013-10-02 00:00:00''', 11, 10) FROM dual;
SUBSTR('TIMESTAMP''2013-10-020
------------------------------
2013-10-0
As you can see you're off by one character. It works with DATE columns, but for TIMESTAMP partitionning, you'll need to adjust the offset.