Precautions For Converting A Table Field From Long To Clob
Jul 31, 2012
I am more of a C/C++ guy and relatively amateur in oracle. I have to update a table field from "Long" to "CLOB". I have planned to do a simple alter table, and as far as I know there won't be any issues.
Queries:
1. Although I have triple checked, is there any scenario under which there can be any data loss during the data type change? The data is very critical and no data loss can be entertained.
2. Is there any easy way to update all the related views without having to do so manually?
3. Any particular precautions I should take before introducing the change?
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Feb 6, 2013
converting BLOB data into varchar2 or long .
we have function which convert long data and return it has varchar . But has part of Apps upgrade the Column has been converted into blob column.
How we need the same function to read the data from BLOB and return its as long or varchar2.
Somewhere i am making mistake..
CREATE OR REPLACE function GDS.test_alert_msg(v_rowid rowid) return varchar2 is
vblob blob;
i2 number;
amt number :=32767;
len number;
pos raw(32767);
position INTEGER := 10000;
my_vr raw(32767);
[Code]....
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Sep 13, 2010
code to append data of 32k to exisitng CLOB field in an oracle table..
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Jun 15, 2012
We are able to insert CLOB into database, Using oracle Text I'm able to search inside clob. [two questions solved ]. The question arise when we need to send this data to application either as file or as text(varchar2).
I'm able to generate file from CLOB using function,unfortunately it resides inside db and developer is not able to access it.
1)There is option to mount application partition inside db and export file over there but it is not viable option according to management.
2)I've Googled the solution to create JAVA API. Which will perform OS command like scp to send file from db to app(or any remote host). For security reason this option is also dropped.
3)I tried dbms_lob.substr but actual text inside clob is too long. File generated from CLOB sized around 5 MB.
So I guess it requires lot of effort if I wanted to convert into varchar2 as out parameter inside function.
So, to give CLOB data to developer as file or as varchar2. I'm not able to get any solution. Is there any other option using database to convert to string/varchar2 from CLOB ? Or do I need to drill down more into third option.
I'm having oracle 10.2.0.5.
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Feb 14, 2013
Why does oracle not allow the following query
select to_clob(1) from dual
union
select wm_concat(sysdate) from dual;
wm_concat returns a clob. To make both queries in the union have the same type columns i convert the column in the first query to a clob but Oracle gives me an [1]: ORA-00932: inconsistent datatypes: expected - got CLOB error even though both are returning a clob value.
Each of the queries work individually and both return a clob value.
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Apr 20, 2009
I would like to know if there is possible to transform a CLOB type variable intro a long type variable. I know, that LONG is obsolete in Oracle, but I need it, because in a PL/SQL 'execute immediate' sentence a CLOB is not allowed.
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Nov 15, 2007
i am trying insert data from one DB to other DB table. one field data type is LONG in first DB table, Same field data type in other DB is CLOB.
i used TO_LOB function to convert from LONG to CLOB data type.
My problem is, i used this TO_LOB function, i got illegal operation of LONG Data type.
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Aug 13, 2012
I would like to run below query on all tables, however it doesnt work on clob and long datatypes
select * from owner.table_name
minus
select * from owner.table_name@remote_db;
from dba_tables
where owner in ( '....');
ORA-00932: inconsistent datatypes: expected - got CLOB
How can I compare the data of clob and long datatypes using dblink ?
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Jan 25, 2013
We have a huge table in production, with LONG column. We are trying to change its datatype to CLOB. The table has 120 Million records and is of 270 GB in size.
We tried using the oracle expdp/impdp option to try the conversion in our perf environment. With 32 parallels, the export completed in 1.5 hrs. However, the import took 13 hrs.
I also tried the to_lob option using inserts, it went on for 20 hrs and I killed the process. Are there any ways to improve the performance of LONG to CLOB conversion on huge tables?
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Oct 7, 2013
We have oracle 10 g and a table contains a clob field . The table size is getting increased day by day . We have decided to zip all the clob data inside the table except last 1 month records.
Table : GENERIC_MESSAGE
Column:
message_id(number)
received_date(date)
message_xml(clob)
How we can do that keeping in mind this is huge data is present in table and huge transaction happened (10k transaction/hr)?
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Nov 6, 2012
I have been used to the consciousness that we should use the minimum length for varchar2 field that can store the data we need manipulate. But recently I was told that it has little impact on performance if we assign a much longer size.
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Oct 15, 2013
Oracle 11.2.0.3 on Linux.
I need to execute this insert as select:
INSERT INTO TAB1 (SQL_ID,SQL_FULLTEXT)
SELECT DISTINCT t.sql_id, t.sql_text FROM DBA_HIST_SQLTEXT;
But I get this error:
ORA-00932: inconsistent datatypes: expected - got clob
This is TAB1:
SQL_ID VARCHAR2(13)
SQL_FULLTEXT CLOB Y
SQL_CUSTOM_HASH VARCHAR2(60) Y
Should I user dbms_lob package? Is so, I do not understand how.
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Apr 15, 2010
I have one table with clob field. The data in this field will contain string having transaction record data. Now I want to read data from this clob filed and insert different record in other oracle table.
example ->
Data in clob field will be->
H|12|1233|fff|sss
L|1234|gggg|tttt|yyyyyy|rrrrr
L|1094|gggg|tttt|yyyyyy|rrrrr
L|1344|gggg|tttt|yyyyyy|rrrrr
L|1666|gggg|tttt|yyyyyy|rrrrr
L|188|gggg|tttt|yyyyyy|rrrrr
I have one master table and one detail table. I want to insert record -> H|12|1233|fff|sss in master table
and records->
L|1234|gggg|tttt|yyyyyy|rrrrr
L|1094|gggg|tttt|yyyyyy|rrrrr
L|1344|gggg|tttt|yyyyyy|rrrrr
L|1666|gggg|tttt|yyyyyy|rrrrr
L|188|gggg|tttt|yyyyyy|rrrrr
in detail table.
End of excercise will redult-> 1 record in header and 5 records in detail table.
I need to implement it in my project.
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Jul 28, 2011
I want to drop some users which are no longer been used .What are the precautions i need to take before i drop users? I have taken logical backup (Export) of users i want to drop.Is there anything i missed out before i drop user?
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Apr 11, 2013
I have a small prolem thats best described like this....
a table called TONY with a field named VISITED (date as YYYYMMDD).
We want to populate the field TIMESTAMP (Last visited timestamp, 18 digits) using midnight or 00:00:00 on VISITED value.
Something like:
UPDATE TONY SET TIMESTAMP = �(whatever the formula is involving VISITED).
but i cannot figure out the best way to derive the TIMESTAMP value...
it's a date to epoch conversion, and i can find many examples of Epoch to date, but thats the wrong way around for me i'm afraid!
Oracle 11gR2 by the way...
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Oct 6, 2011
I want to extract the data from the Clob field. I have the following table,create table test123(col1 char(24), col2 clob); And following data,
Insert into test123 (col1,col2) values ('ABCDE','<?xml version="1.0" encoding="UTF-8"?>
<Attributes>
<Attribute DataType="Text-40" DisplayName="DropDirectory"
IsNotDeletable="Y" Modifiable="Y" Name="DropDirectory" Value="${Dir1}"/>
<Attribute DataType="Text-40" DisplayName="PrinterAlias"
IsNotDeletable="Y" Modifiable="Y" Name="PrinterAlias" Value="\Printer3Printer4"/>
<Attribute DataType="Text-40" DisplayName="PrintServerHostName"
IsNotDeletable="Y" Modifiable="Y" Name="PrintServerHostName" Value=""/>
<Attribute DataType="Count" DisplayName="PrintServerPort"
IsNotDeletable="Y" Modifiable="Y" Name="PrintServerPort" Value="2723"/>
</Attributes>');
[code]....
The data will be available like this only, The same XML tag is used everywhere.
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Jun 18, 2012
I'm loading data from text file separated by TAB and i got the error below for some lines. Event the column is CLOB data type is there a limitation of the size of a CLOB data type. The error is:
Record 74: Rejected - Error on table _TEMP, column DEST.
Field in data file exceeds maximum length
I'm using SQL Loader and the database is oracle 11g r2 on linux Red hat 5. Here are the line causing the error from my data file and my table description for test:
create table TEMP
(
CODE VARCHAR2(100),
DESC VARCHAR2(500),
RATE FLOAT,
INCREASE VARCHAR2(20),
COUNTRY VARCHAR2(500),
DEST CLOB,
[code]........
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Oct 17, 2011
Is there some functions to convert the long type field data to varchar2 type?
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Sep 21, 2010
I am working on a POC. The goal is to do a
select * from function('input')
where the function dynamically returns different tables.
I have gotten to the point where I can return the cursor but I cannot format it as a table to use in the query. It return's it as XML. This is my function:
create or replace
FUNCTION CAMS_FUN_GEN_REPORTS(PARAM1 IN VARCHAR2) RETURN SYS_refCURSOR AS
BEGIN
DECLARE
p_recordset SYS_refCURSOR;
begin
OPEN p_recordset FOR 'SELECT * from STATS_FLAGGED_TOTALS_ME';
RETURN p_recordset;
END;
END CAMS_FUN_GEN_REPORTS;
This is my query:
select * from CAMS_FUN_GEN_REPORTS('')
So normally you would do this
select * from TABLE(CAMS_FUN_GEN_REPORTS('') as tabletype)
But I will never know the end result table as it will be dynamic so I have to find a way to cast the result of the function into a new table I can select on.
I have looked into pipe lining also but from what I can tell you still need to know the table definition. Which I can't know from the client side. The server will control the 'routing' and thus the end result of the select.
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Mar 10, 2012
I need to search a pattern backwards in a CLOB field.Function DBMS_LOB.instr does not work with '-1' offset (where to start the search) as instr does.
Parameters: instr(text_to_be_searched, pattern, offset, nth)
Example: I want to search 'Hello world' for the first instance of the letter 'o' starting from the end, backwards.As you can see, result for DBMS_LOB.instr is null when entered -1 for offset.
select
DBMS_LOB.instr('Hello world','o',-1,1) lob_i,
instr('Hello world','o',-1,1) std_i
from dual;
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Apr 26, 2012
I have a table A, whose table structure is in the below format.
Table A
ID DESC VALUE
123 A 454
123 B 1111
123 C 111
123 D 222
124 A 123
124 B 1
124 C 111
124 D 44
Now i need to insert the data from this table to another table B, the sturcture of which is as below
Table B
ID A B C D
1234541111111222
124123111144
How do i frame a query to fetch data from table A and insert that into table B? I don't want to use max and decode combination. as it would return only single row for an ID. I need all the id's to be displayed.
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Dec 7, 2011
I have a comma separated list 'black','red','white' and I want to get each of words in this list in one rows. Some time ago I done it with:
QUOTE select * from XXX('black','red','white')
where XXX was a function which converted list to table.
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Dec 22, 2012
I got an exception when I was using sesame adapter to dump a turtle file which contains long texts as objects into oracle semantic database. The exception information is:
org.openrdf.repository.RepositoryException: org.openrdf.sail.SailException: java.sql.SQLException: ORA-01461: can bind a LONG value only for insert into a LONG column
ORA-06512: in "SF.ORACLE_ORARDF_ADDHELPER", line 1
ORA-06512: in line 1
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802) ...
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Nov 14, 2011
I have a table called Customer_Type with following fields
Customer_type ,Active_date, Inactive_date
regular,11/01/2011
daily,11/04/2011
monthly,11/05/2011/11/11/2011
Tbale 2:Customer
Customer_name,Customer_type,Customer_Inactive_date
John,regular,
James,monthly,
Jake,daily,
Jill,monthly
What i wnat is to update the Customer_inactive_date with the Incative_date field from Customer_type based on their Customer_type... So james and Jill would have their rows updated in this scneario ..How can i achive this in pl/Sql
I have teh code using merge function..I want something in traditional old fashion..
The sql statements are below
CREATE TABLE CUSTOMER_TYPE
(
type_code VARCHAR2(10),
[Code]....
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Sep 26, 2012
resolve problem with move lob objects ? I move table partition and lob (BLOB) from one tablespace to another :
alter table EBIF.APO_T_VER_DISP_ACC_RESP MOVE PARTITION P1M20120901 LOB(SIGNATURE_PATTERN) STORE AS (TABLESPACE tmp) t
able EBIF.APO_T_VER_DISP_ACC_RESP MOVE PARTITION have : pbeb_ap1.SYS>select partition_name , tablespace_name from dba_lob_partitions where table_name='APO_T_VER_DISP_ACC_RESP';
PARTITION_NAME |TABLESPACE_NAME
------------------------------|------------------------------
P1M20110901 |TD1M20110901
P1M20111001 |TMP
P1M20111101 |TMP
P1M20111201 |TMP
P1M20120101 |TD1M20120101
[code]....
I used skrip to generate move :
select 'alter table '||table_owner||'.'||table_name||' MOVE PARTITION '||partition_name||' LOB('||COLUMN_NAME||') STORE AS (TABLESPACE TD_PART_RW) PARALLEL 4;'
from dba_lob_partitions where tablespace_name='TMP';
when I started loadink into dis table I get : ORA-01461: can bind a LONG value only for insert into a LONG column
when I recreate this table ALL work ok , but new table is not partitioned .
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Nov 12, 2010
I am expecting the input to my procedure will be in the following format
'AAA, aaa, Aa12|BBB, bbb, bb2B|dd3, DDDE,ddd67'
I need to convert it to nested table and when I query the nested table , the output should be
column_value
------------
AAA
aaa
Aa1
BBB
bbb
bb2B
dd3
DDDE
ddd67
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Apr 27, 2010
I have question related to LONG datatype. Actually from google and get to know that one table can have only one LONG datatype when i searched for reason . i got these resons:-
With 9i (I believe) and later versions, Oracle deprecates using the long datatype in favor of the lob (clob, nclob and blog) datatypes. It is only supported for backward compatibility.
Restriction:- It can not be used in create type as an attribute of the defined type.
It can not be used in where conditions.
There can be no indexes on long columns.
Regular Expression are not possible.
long can not be returned from a stored function.
SQL can not call functions that have an attribute of type long.
And even more restrictions.
So I want to know that is only reason because of that Oracle doesn't allow us to make two Column or is there any strong reason which make it more logical Like storing of data in Row blocks or some thing else.
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Jan 23, 2011
I use sqlplus in oracle (linux).I have a table and the string cell have long string .
Like below :
column A Column B
A BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
.....................................BBBBBBBBBBB
So, I need to edit/update the row A and the value in Column B.But the string in Column B is so long and I only need to edit one character.IF I use update command , I need to type very long string and it is easy to wrong edit .
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Sep 20, 2010
We are firing a normal Drop command on our database and the database version is 10.2.0.4.The database is running on AIX v5.The command is taking more time than usual .
When i am monitoring the session i can see that a call is being made to procedure "aw_drop_proc".Could i ask you if this is something that is taking more time than usual.
We are not having any partitions on the nested tables .We have a pack of tables and we are dropping this pack through a procedure.The pack comprises of nested tables & normal tables.To drop a nested table it is taking around 6 seconds(Table with no rows) and a normal table(With no rows) it is taking 17 milli seconds.We have a partition on Normal table.
The same operation in windows is taking very less time when compared to AIX.
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Oct 12, 2012
We are working on a performance tuning aspect, where in a table has a LONG datatype and number of round trips are increasing based on the number of rows fetched.i.e one round trip for every row.
Background.
1. created a table with LONG data type.
2. inserted bulk load of data.
3. set auto trace on and executed below tests..
SQL> select count(*) from test_long;
COUNT(*)
----------
6110
SQL> desc test_long
Name Null? Type
----------------------------------------------------------------------------------------------------- -------- ----------------------------------------------------------------------------
ID NUMBER
TESTLONG LONG
[code].....
but on LONG column, irrespective of the array size the round trips does not reduce.
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