diff --git a/db-scripts/src/main/resources/cgds.sql b/db-scripts/src/main/resources/cgds.sql
index 44d88960b4d..a3e37649d3b 100644
--- a/db-scripts/src/main/resources/cgds.sql
+++ b/db-scripts/src/main/resources/cgds.sql
@@ -669,7 +669,7 @@ CREATE TABLE `clinical_event_data` (
   `VALUE` varchar(5000) NOT NULL,
   FOREIGN KEY (`CLINICAL_EVENT_ID`) REFERENCES `clinical_event` (`CLINICAL_EVENT_ID`) ON DELETE CASCADE,
   INDEX `idx_clinical_event_key` (`KEY`),
-  INDEX `idx_clinical_event_value` (`VALUE`)
+  INDEX `idx_clinical_event_value` (`VALUE` (768)) -- max key length is 3072 bytes, for MySQL 8 default character set utf8mb4, max characters length are 768
 );
 
 -- --------------------------------------------------------
diff --git a/db-scripts/src/main/resources/migration.sql b/db-scripts/src/main/resources/migration.sql
index 3983cb589cf..9e7e07d2f20 100644
--- a/db-scripts/src/main/resources/migration.sql
+++ b/db-scripts/src/main/resources/migration.sql
@@ -1030,5 +1030,7 @@ CREATE INDEX idx_sample_stable_id ON sample (`STABLE_ID`);
 UPDATE `info` SET `DB_SCHEMA_VERSION`="2.13.1";
 
 ##version: 2.13.2
+ALTER TABLE clinical_event_data DROP INDEX idx_clinical_event_value;
 CREATE INDEX idx_patient_stable_id ON patient (`STABLE_ID`);
-UPDATE `info` SET `DB_SCHEMA_VERSION`="2.13.2";
\ No newline at end of file
+CREATE INDEX idx_clinical_event_value ON clinical_event_data (`VALUE`(768)) -- max key length is 3072 bytes, for MySQL 8 default character set utf8mb4, max characters length are 768
+UPDATE `info` SET `DB_SCHEMA_VERSION`="2.13.2";