Limit index to a certain length to avoid key exceeding length

dippindots · Oct 31, 2023 · 539a498 · 539a498
1 parent 255cfaa
commit 539a498
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git 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
@@ -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";
+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";