diff --git a/source/libs/tdb/src/db/pgfile.c b/source/libs/tdb/src/db/pgfile.c
index 670fc3a667215f78ca11fa08b46e02678048498e..f7d4eef7994c17950f6bdaada0fdc3cc1f2b1332 100644
--- a/source/libs/tdb/src/db/pgfile.c
+++ b/source/libs/tdb/src/db/pgfile.c
@@ -36,6 +36,7 @@ int pgFileOpen(const char *fname, SPgCache *pPgCache, SPgFile **ppPgFile) {
   }
 
   pPgFile->pPgCache = pPgCache;
+  // pPgFile->pgSize = ; (TODO)
 
   pPgFile->fd = open(fname, O_RDWR, 0755);
   if (pPgFile->fd < 0) {
diff --git a/source/libs/tdb/src/inc/pgfile.h b/source/libs/tdb/src/inc/pgfile.h
index e951d59da0f81c48fa2aeab03b354a7cd6492a04..ad59fc711c64066d687766ad072360321705ed70 100644
--- a/source/libs/tdb/src/inc/pgfile.h
+++ b/source/libs/tdb/src/inc/pgfile.h
@@ -25,6 +25,7 @@ struct SPgFile {
   char *    fname;                    // backend file name
   uint8_t   fileid[TDB_FILE_ID_LEN];  // file id
   SPgCache *pPgCache;                 // page cache underline
+  pgsize_t  pgSize;
   int       fd;
   pgno_t    pgFileSize;
 };