diff --git a/uppsrc/MySql/MySqlSchema.h b/uppsrc/MySql/MySqlSchema.h
index e67744058..e688d9629 100644
--- a/uppsrc/MySql/MySqlSchema.h
+++ b/uppsrc/MySql/MySqlSchema.h
@@ -33,11 +33,11 @@
 #define STRING_(x, n)              COLUMN_(MySqlTextType(n), String, x, n, 0)
 #define STRING_ARRAY_(x, n, items) COLUMN_ARRAY_(MySqlTextType(n), String, x, n, 0, items)
 
-#define BLOB(x)                    COLUMN("longblob", String, x, 0, 0)
-#define BLOB_(x)                   COLUMN_("longblob", String, x, 0, 0)
+#define BLOB(x)                    COLUMN("longblob", String, x, INT_MAX/2, 0)
+#define BLOB_(x)                   COLUMN_("longblob", String, x, INT_MAX/2, 0)
 
-#define CLOB(x)                    COLUMN("text", String, x, 0, 0)
-#define CLOB_(x)                   COLUMN_("text", String, x, 0, 0)
+#define CLOB(x)                    COLUMN("text", String, x, INT_MAX/2, 0)
+#define CLOB_(x)                   COLUMN_("text", String, x, INT_MAX/2, 0)
 
 #ifndef PRIMARY_KEY
 #define PRIMARY_KEY                INLINE_ATTRIBUTE("primary key")
diff --git a/uppsrc/Oracle/OracleSchema.h b/uppsrc/Oracle/OracleSchema.h
index 6fd6126ef..5c9b402fa 100644
--- a/uppsrc/Oracle/OracleSchema.h
+++ b/uppsrc/Oracle/OracleSchema.h
@@ -39,11 +39,11 @@
 #define LONGRAW(x)                 COLUMN("long raw", String, x, 0, 0)
 #define LONGRAW_(x)                COLUMN_("long raw", String, x, 0, 0)
 
-#define BLOB(x)                    COLUMN("blob", String, x, 0, 0)
-#define BLOB_(x)                   COLUMN_("blob", String, x, 0, 0)
+#define BLOB(x)                    COLUMN("blob", String, x, INT_MAX/2, 0)
+#define BLOB_(x)                   COLUMN_("blob", String, x, INT_MAX/2, 0)
 
-#define CLOB(x)                    COLUMN("clob", String, x, 0, 0)
-#define CLOB_(x)                   COLUMN_("clob", String, x, 0, 0)
+#define CLOB(x)                    COLUMN("clob", String, x, INT_MAX/2, 0)
+#define CLOB_(x)                   COLUMN_("clob", String, x, INT_MAX/2, 0)
 
 #define SEQUENCE(x)                SCHEMA("create sequence " #x " start with 1;",\
                                           "drop sequence " #x ";") \
diff --git a/uppsrc/PostgreSQL/PostgreSQLSchema.h b/uppsrc/PostgreSQL/PostgreSQLSchema.h
index 1a973bc92..04c6e9c3e 100644
--- a/uppsrc/PostgreSQL/PostgreSQLSchema.h
+++ b/uppsrc/PostgreSQL/PostgreSQLSchema.h
@@ -59,11 +59,11 @@
 #define LONGRAW(x)                 COLUMN("bytea", String, x, 0, 0)
 #define LONGRAW_(x)                COLUMN_("bytea", String, x, 0, 0)
 
-#define BLOB(x)                    COLUMN("bytea", String, x, 0, 0)
-#define BLOB_(x)                   COLUMN_("bytea", String, x, 0, 0)
+#define BLOB(x)                    COLUMN("bytea", String, x, INT_MAX/2, 0)
+#define BLOB_(x)                   COLUMN_("bytea", String, x, INT_MAX/2, 0)
 
-#define CLOB(x)                    COLUMN("text", String, x, 0, 0)
-#define CLOB_(x)                   COLUMN_("text", String, x, 0, 0)
+#define CLOB(x)                    COLUMN("text", String, x, INT_MAX/2, 0)
+#define CLOB_(x)                   COLUMN_("text", String, x, INT_MAX/2, 0)
 
 #define SEQUENCE(x)                SCHEMA("create sequence " #x " start with 1;",\
                                           "drop sequence " #x ";") \
diff --git a/uppsrc/plugin/sqlite3/Sqlite3Schema.h b/uppsrc/plugin/sqlite3/Sqlite3Schema.h
index 6032af63f..99f8826cb 100644
--- a/uppsrc/plugin/sqlite3/Sqlite3Schema.h
+++ b/uppsrc/plugin/sqlite3/Sqlite3Schema.h
@@ -33,11 +33,11 @@
 #define BOOL_(x)                   COLUMN_("text", bool, x, 0, 0)
 #define BOOL_ARRAY_(x, items)      COLUMN_ARRAY_("text", bool, x, 0, 0, items)
 
-#define BLOB(x)                    COLUMN("blob", String, x, 0, 0)
-#define BLOB_(x)                   COLUMN_("blob", String, x, 0, 0)
+#define BLOB(x)                    COLUMN("blob", String, x, INT_MAX/2, 0)
+#define BLOB_(x)                   COLUMN_("blob", String, x, INT_MAX/2, 0)
 
-#define LONGRAW(x)                 COLUMN("blob", String, x, 0, 0)
-#define LONGRAW_(x)                COLUMN_("blob", String, x, 0, 0)
+#define LONGRAW(x)                 COLUMN("blob", String, x, INT_MAX/2, 0)
+#define LONGRAW_(x)                COLUMN_("blob", String, x, INT_MAX/2, 0)
 
 #ifndef PRIMARY_KEY
 #define PRIMARY_KEY                INLINE_ATTRIBUTE("primary key")