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currently i have query with this code to_char(CLOB_COLUM) like %s but the following wont work for very big clob. Is there another solution to check if this column contains some string. Using oracle 11.2.0.4.0


You can use DBMS_LOB.INSTR( clob_value, pattern [, offset [, occurrence]] ):

SELECT *
FROM   your_table
WHERE  DBMS_LOB.INSTR( clob_column, 'string to match' ) > 0;

or

SELECT *
FROM   your_table
WHERE  clob_column LIKE '%string to match%';

Querying with Oracle Text, Note the bind variable :doc_text which contains the document CLOB to be classified. the string of words is considered a phrase and Oracle Text searches for the Because users of your application might not know which words represent a  Split the CLOB into a series of lines - e.g. split it by newline/carriage return characters if that's really what you meant by "line". Check each line to see if it includes the substring, e.g. onblur. If it does, you have found your line. Option 2.


Base on MT0's answer. I test which way is efficient.

The CLOB Column length is 155018 and search for 32 length string.

Here is my test.

| INSTR  | LIKE  |
|:-------|------:|
| 0.857  |0.539  |
| 0.127  |0.179  |
| 1.635  |0.534  |
| 0.511  |0.818  |
| 0.429  |1.038  |
| 1.586  |0.772  |
| 0.461  |0.172  |
| 0.126  |1.379  |
| 1.068  |1.088  |
| 1.637  |1.169  |
| 0.5    |0.443  |
| 0.674  |0.432  |
| 1.201  |0.135  |
| 0.419  |2.057  |
| 0.731  |0.462  |
| 0.787  |1.956  |

The average time of INSTR is 0.797.

The average time of LIKE is 0.823.

Search a CLOB column tips, How can I search inside the contents of a CLOB datatype? The CLOB datatype requires the dbms_lob package. Oracle SQL "contains" clause tips clob_tab where dbms_lob.instr(clob_column,'burleson')>0; It is not necessary to create a Oracle text index to search inside a CLOB (but you will do a full-table scan). Also note that the dbms_lob.instr can be used with other dbms_lob functions such as dbms_lob.substr to search and extract data from inside a CLOB.


If you want to see the column's value and Oracle returns ORA-22835 (buffer too small) for WHERE clob_column LIKE '%string to match%', then you should to apply some workaround.

The combination of DBMS_LOB.instr and DBMS_LOB.substr could be a solution. See e.g. this Stackoverflow tip. So, in your case:

SELECT DBMS_LOB.substr(your_clob_column, DBMS_LOB.instr(your_clob_column,'string to match'), 1) AS Text
FROM your_table
WHERE DBMS_LOB.instr(your_clob_column, 'string to match') > 0 

check if clob contains string oracle, check if clob contains string oracle. how to query clob data in oracle oracle compare string to clob clob alternative in oracle oracle clob to string how to compare  If you want to see the column's value and Oracle returns ORA-22835 (buffer too small) for WHERE clob_column LIKE '%string to match%', then you should to apply some workaround. The combination of DBMS_LOB.instr and DBMS_LOB.substr could be a solution.


How Query CLOB Column That Contains a Given String, Let us know if you are having problems. santa Mufasa (aka Dave of Sandy, Utah, USA) [I provide low-cost, remote Database Administration  declare v_result clob; begin ---- some operation on v_result dbms_lob.substr( v_result, 4000 ,length(v_result) - 3999 ); end; / In dbms_lob.substr. first parameter is clob which you want to extract . Second parameter is how much length of clob you want to extract. Third parameter is from which word you want to extract .


Oracle clob to string, The TO_CLOB function returns a CLOB value. The last column of the test data (​only one row) contains about 4100 characters which seems to be the root cause​  Are you just wanting to check for a CLOB that doesn't have any length? While not exactly what your asking, it's basically the same thing? select * from bar where dbms_lob.getlength(foo) = 0; Here is the complete test: SQL> create table bar (foo clob); Table created. SQL> insert into bar values (empty_clob()); 1 row created.


Oracle / PLSQL: INSTR Function, When getting the substring of a CLOB column and using a query tool that has size/buffer restrictions sometimes See oracle documentation for more info on the substr command DBMS_LOB. In above example i know my clob size is more than 50000 , so i want last 4000 character . check if clob contains string oracle. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Check for a substring in a string in Oracle without LIKE