diff --git a/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SQLServerLegacyDialect.java b/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SQLServerLegacyDialect.java
index 0600065ad2..18b5a37615 100644
--- a/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SQLServerLegacyDialect.java
+++ b/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SQLServerLegacyDialect.java
@@ -36,6 +36,7 @@ import org.hibernate.dialect.sequence.SequenceSupport;
 import org.hibernate.dialect.unique.AlterTableUniqueIndexDelegate;
 import org.hibernate.dialect.unique.SkipNullableUniqueDelegate;
 import org.hibernate.dialect.unique.UniqueDelegate;
+import org.hibernate.engine.jdbc.Size;
 import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
 import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
 import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
@@ -67,6 +68,7 @@ import org.hibernate.tool.schema.spi.Exporter;
 import org.hibernate.type.BasicType;
 import org.hibernate.type.BasicTypeRegistry;
 import org.hibernate.type.StandardBasicTypes;
+import org.hibernate.type.descriptor.java.JavaType;
 import org.hibernate.type.descriptor.java.PrimitiveByteArrayJavaType;
 import org.hibernate.type.descriptor.jdbc.JdbcType;
 import org.hibernate.type.descriptor.jdbc.TimestampUtcAsJdbcTimestampJdbcType;
@@ -113,6 +115,26 @@ public class SQLServerLegacyDialect extends AbstractTransactSQLDialect {
 	private final StandardSequenceExporter exporter;
 	private final UniqueDelegate uniqueDelegate;
 
+	private final SizeStrategy sizeStrategy = new SizeStrategyImpl() {
+		@Override
+		public Size resolveSize(
+				JdbcType jdbcType,
+				JavaType<?> javaType,
+				Integer precision,
+				Integer scale,
+				Long length) {
+			switch ( jdbcType.getDdlTypeCode() ) {
+				case BLOB:
+				case CLOB:
+				case NCLOB:
+					return Size.length( getDefaultLobLength() );
+				default:
+					return super.resolveSize( jdbcType, javaType, precision, scale, length );
+			}
+		}
+	};
+
+
 	public SQLServerLegacyDialect() {
 		this( DatabaseVersion.make( 8, 0 ) );
 	}
@@ -422,6 +444,11 @@ public class SQLServerLegacyDialect extends AbstractTransactSQLDialect {
 		};
 	}
 
+	@Override
+	public SizeStrategy getSizeStrategy() {
+		return sizeStrategy;
+	}
+
 	@Override
 	public String castPattern(CastType from, CastType to) {
 		if ( to == CastType.STRING ) {
diff --git a/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SybaseLegacyDialect.java b/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SybaseLegacyDialect.java
index b5fade8185..2dd133a9a2 100644
--- a/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SybaseLegacyDialect.java
+++ b/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/SybaseLegacyDialect.java
@@ -27,6 +27,7 @@ import org.hibernate.dialect.function.IntegralTimestampaddFunction;
 import org.hibernate.dialect.function.SybaseTruncFunction;
 import org.hibernate.dialect.unique.SkipNullableUniqueDelegate;
 import org.hibernate.dialect.unique.UniqueDelegate;
+import org.hibernate.engine.jdbc.Size;
 import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
 import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
 import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
@@ -60,6 +61,7 @@ import org.hibernate.sql.ast.tree.select.SelectStatement;
 import org.hibernate.sql.exec.spi.JdbcOperation;
 import org.hibernate.type.JavaObjectType;
 import org.hibernate.type.NullType;
+import org.hibernate.type.descriptor.java.JavaType;
 import org.hibernate.type.descriptor.jdbc.BlobJdbcType;
 import org.hibernate.type.descriptor.jdbc.ClobJdbcType;
 import org.hibernate.type.descriptor.jdbc.JdbcType;
@@ -90,6 +92,29 @@ public class SybaseLegacyDialect extends AbstractTransactSQLDialect {
 	@Deprecated(forRemoval = true)
 	protected final boolean jtdsDriver;
 
+	private final SizeStrategy sizeStrategy = new SizeStrategyImpl() {
+		@Override
+		public Size resolveSize(
+				JdbcType jdbcType,
+				JavaType<?> javaType,
+				Integer precision,
+				Integer scale,
+				Long length) {
+			switch ( jdbcType.getDdlTypeCode() ) {
+				case Types.NCLOB:
+				case Types.CLOB:
+				case Types.BLOB:
+					return Size.length( getDefaultLobLength() );
+				case Types.FLOAT:
+					// Sybase ASE allows FLOAT with a precision up to 48
+					if ( precision != null ) {
+						return Size.precision( Math.min( Math.max( precision, 1 ), 48 ) );
+					}
+			}
+			return super.resolveSize( jdbcType, javaType, precision, scale, length );
+		}
+	};
+
 	public SybaseLegacyDialect() {
 		this( DatabaseVersion.make( 11, 0 ) );
 	}
@@ -169,6 +194,11 @@ public class SybaseLegacyDialect extends AbstractTransactSQLDialect {
 		};
 	}
 
+	@Override
+	public SizeStrategy getSizeStrategy() {
+		return sizeStrategy;
+	}
+
 	@Override
 	public boolean supportsNullPrecedence() {
 		return false;