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VLMatch library compilation#

VLMatch for Oracle#

This section describes VLMatch library building and new function appliance to the Oracle database.

For VLMatch UDx function compilation one needs to:

  • Install required environment, see requirements:

  • Install the gcc/g++ 4.8 or higher 

yum -y install gcc-c++.x86_64
  • Change SDK_HOME variable - oracle sdk root (default is $ORACLE_HOME/bin, check $ORACLE_HOME environment variable is set) in the makefile.

  • Go to the directory and run the "make.sh" file:

    • cd /var/lib/luna/current/extras/VLMatch/oracle/
    • chmod +x make.sh
    • ./make.sh

  • Define the library and the function inside the database (from database console):

CREATE OR REPLACE LIBRARY VLMatchSource AS '$ORACLE_HOME/bin/VLMatchSource.so';
CREATE OR REPLACE FUNCTION VLMatch(descriptorFst IN RAW, descriptorSnd IN RAW, length IN BINARY_INTEGER)
  RETURN BINARY_FLOAT 
AS
  LANGUAGE C
  LIBRARY VLMatchSource
  NAME "VLMatch"
  PARAMETERS (descriptorFst BY REFERENCE, descriptorSnd BY REFERENCE, length UNSIGNED SHORT, RETURN FLOAT);

Test function within call (from database console):

SELECT VLMatch(HEXTORAW('1234567890123456789012345678901234567890123456789012345678901234'), HEXTORAW('0123456789012345678901234567890123456789012345678901234567890123'), 32) FROM DUAL;

The result should be equal to "0.4765625".