refactor: CHUNK_SIZE 10000 으로 조정

src/main/java/com/mybooks/batch/config/batch/birthdaycoupon/BirthDayCouponBatchConfig.java

@@ -55,7 +55,7 @@ public class BirthDayCouponBatchConfig {
     public final SqlSessionFactory sqlSessionFactory;
     private final JobLauncher jobLauncher;
     private final CouponMapper couponMapper;
-    private static final int CHUNK_SIZE = 10;
+    private static final int CHUNK_SIZE = 10000;
 
     /**
      * methodName : runJob <br>

src/main/java/com/mybooks/batch/config/batch/usergradechangebatchconfig/UserGradeChangeBatchConfig.java

@@ -50,7 +50,7 @@ public class UserGradeChangeBatchConfig {
      */
     public final SqlSessionFactory sqlSessionFactory;
     private final JobLauncher jobLauncher;
-    private static final int CHUNK_SIZE = 10;
+    private static final int CHUNK_SIZE = 10000;
 
     /**
      * methodName : runJob <br>

src/main/java/com/mybooks/batch/config/batch/userstatuschange/UserStatusChangeBatchConfig.java

@@ -48,7 +48,7 @@ public class UserStatusChangeBatchConfig {
     private final StepBuilderFactory stepBuilderFactory;
     public final SqlSessionFactory sqlSessionFactory;
     private final JobLauncher jobLauncher;
-    private static final int CHUNK_SIZE = 10;
+    private static final int CHUNK_SIZE = 10000;
 
     /**
      * methodName : runJob <br>