diff --git a/source/libs/tdb/src/db/tdb_db.c b/source/libs/tdb/src/db/tdb_db.c
index 3675844535319d0f35bd62b6f74a6c69c69bba82..112fade741af99d0cea07157d2f2201dbf60f5f9 100644
--- a/source/libs/tdb/src/db/tdb_db.c
+++ b/source/libs/tdb/src/db/tdb_db.c
@@ -15,12 +15,59 @@
 
 #include "tdb_db.h"
 
+static int tdbOpenImpl(TDB *dbp);
+
 int tdbOpen(TDB **dbpp, const char *fname, const char *dbname, uint32_t flags) {
-  // TODO
+  TDB *       dbp;
+  TDB_MPFILE *mpf;
+  uint8_t     fileid[TDB_FILE_ID_LEN];
+
+  if ((dbp = (TDB *)calloc(1, sizeof(*dbp))) == NULL) {
+    return -1;
+  }
+
+  if ((dbp->fname = strdup(fname)) == NULL) {
+    free(dbp);
+    return -1;
+  }
+
+  if ((dbname) && ((dbp->dbname = strdup(dbname)) == NULL)) {
+    free(dbp->fname);
+    free(dbp);
+    return -1;
+  }
+
+  // if (tdbGnrtFileID(fname, fileid) < 0) {
+  //   // todo
+  //   return -1;
+  // }
+
+  // TODO: mpf = tdbGetMPFileByID(fileid);
+  if (mpf == NULL) {
+    // todoerr: maybe we need to create one
+    return -1;
+  }
+
+  if (tdbOpenImpl(dbp) < 0) {
+    // todoerr
+    return -1;
+  }
+
+  *dbpp = dbp;
   return 0;
 }
 
 int tdbClose(TDB *dbp, uint32_t flags) {
   // TODO
   return 0;
+}
+
+static int tdbOpenImpl(TDB *dbp) {
+  if (dbp->dbname == NULL) {
+    // todo: open the DB as a master DB
+  } else {
+    // todo: open the DB as a sub-db
+  }
+  // TODO
+  return 0;
 }
\ No newline at end of file