diff --git a/source/libs/tdb/src/db/tdb.c b/source/libs/tdb/src/db/tdb.c
index eab3db13b7d0df95989545c3fd372cd6473d6f68..9fe15ce156445c20675f075846fdbd93ef3a42c3 100644
--- a/source/libs/tdb/src/db/tdb.c
+++ b/source/libs/tdb/src/db/tdb.c
@@ -86,7 +86,7 @@ int tdbOpen(TDB *pDb, const char *fname, const char *dbname, TENV *pEnv) {
 
   pDb->dbname[dbNameLen] = '\0';
 
-  // open pPgFile or get from the env
+  // get page file from the env, if not opened yet, open it
   pPgFile = NULL;
   snprintf(dbfname, 128, "%s/%s", tdbEnvGetRootDir(pEnv), fname);
   fileExist = (tdbCheckFileAccess(fname, TDB_F_OK) == 0);
@@ -103,39 +103,11 @@ int tdbOpen(TDB *pDb, const char *fname, const char *dbname, TENV *pEnv) {
     }
   }
 
-#if 0
-  pDb->pEnv = pEnv;
-
-  // register DB to ENV
-
-  ASSERT(fname != NULL);
-
-  // Check if file exists
-  if (tdbCheckFileAccess(fname, TDB_F_OK) != 0) {
-    if (1) {
-      // create the file
-    }
-  }
-
-  // Check if the SPgFile already opened
-  tdbGnrtFileID(fname, fileid, false);
-  pPgFile = tdbEnvGetPageFile(pEnv, fileid);
-  if (pPgFile == NULL) {
-    pPgCache = tdbEnvGetPgCache(pEnv);
-    if ((ret = pgFileOpen(&pPgFile, fname, pPgCache)) != 0) {
-      return -1;
-    }
-  }
+  // TODO: open the database (an existing or a new one)
 
   pDb->pPgFile = pPgFile;
-
-  // open the access method (TODO)
-  if (btreeOpen(&pBt, pPgFile) != 0) {
-    return -1;
-  }
-
-  pDb->pBt = pBt;
-#endif
+  tdbEnvRgstDB(pEnv, pDb);
+  pDb->pEnv = pEnv;
 
   return 0;
 }
diff --git a/source/libs/tdb/src/db/tdbEnv.c b/source/libs/tdb/src/db/tdbEnv.c
index 9954770046148c187ff90df15f820693e6e9f4f1..237220d155a60d83fc249be39aa3449b2df4f04d 100644
--- a/source/libs/tdb/src/db/tdbEnv.c
+++ b/source/libs/tdb/src/db/tdbEnv.c
@@ -29,6 +29,12 @@ struct STDbEnv {
   SJournal *pJournal;
 };
 
+#define TDB_ENV_PGF_HASH(fileid)        \
+  ({                                    \
+    uint8_t *tmp = (uint8_t *)(fileid); \
+    tmp[0] + tmp[1] + tmp[2];           \
+  })
+
 static int tdbEnvDestroy(TENV *pEnv);
 
 int tdbEnvCreate(TENV **ppEnv, const char *rootDir) {
@@ -108,8 +114,15 @@ pgsz_t tdbEnvGetPageSize(TENV *pEnv) { return pEnv->pgSize; }
 cachesz_t tdbEnvGetCacheSize(TENV *pEnv) { return pEnv->cacheSize; }
 
 SPgFile *tdbEnvGetPageFile(TENV *pEnv, const uint8_t fileid[]) {
-  // TODO
-  return NULL;
+  SPgFileList *pBucket;
+  SPgFile *    pPgFile;
+
+  pBucket = pEnv->pgfht.buckets + (TDB_ENV_PGF_HASH(fileid) % TDB_ENV_PGF_HASH_BUCKETS);  // TODO
+  for (pPgFile = TD_DLIST_HEAD(pBucket); pPgFile != NULL; pPgFile = TD_DLIST_NODE_NEXT_WITH_FIELD(pPgFile, envHash)) {
+    if (memcmp(fileid, pPgFile->fileid, TDB_FILE_ID_LEN) == 0) break;
+  };
+
+  return pPgFile;
 }
 
 SPgCache *tdbEnvGetPgCache(TENV *pEnv) { return pEnv->pPgCache; }
@@ -131,12 +144,6 @@ int tdbEnvCommit(TENV *pEnv) {
 
 const char *tdbEnvGetRootDir(TENV *pEnv) { return pEnv->rootDir; }
 
-#define TDB_ENV_PGF_HASH(fileid)        \
-  ({                                    \
-    uint8_t *tmp = (uint8_t *)(fileid); \
-    tmp[0] + tmp[1] + tmp[2];           \
-  })
-
 int tdbEnvRgstPageFile(TENV *pEnv, SPgFile *pPgFile) {
   SPgFileList *pBucket;
 
@@ -145,5 +152,10 @@ int tdbEnvRgstPageFile(TENV *pEnv, SPgFile *pPgFile) {
   pBucket = pEnv->pgfht.buckets + (TDB_ENV_PGF_HASH(pPgFile->fileid) % TDB_ENV_PGF_HASH_BUCKETS);  // TODO
   TD_DLIST_APPEND_WITH_FIELD(pBucket, pPgFile, envHash);
 
+  return 0;
+}
+
+int tdbEnvRgstDB(TENV *pEnv, TDB *pDb) {
+  // TODO
   return 0;
 }
\ No newline at end of file
diff --git a/source/libs/tdb/src/inc/tdbEnv.h b/source/libs/tdb/src/inc/tdbEnv.h
index 4f9f32b8ea0554a7416b544fabd09c6d2b8d8c1c..6cb5c7a2cda8537ee07a4820e9cb9d5ae6df93a9 100644
--- a/source/libs/tdb/src/inc/tdbEnv.h
+++ b/source/libs/tdb/src/inc/tdbEnv.h
@@ -24,6 +24,7 @@ const char* tdbEnvGetRootDir(TENV* pEnv);
 SPgFile*    tdbEnvGetPageFile(TENV* pEnv, const uint8_t fileid[]);
 SPgCache*   tdbEnvGetPgCache(TENV* pEnv);
 int         tdbEnvRgstPageFile(TENV* pEnv, SPgFile* pPgFile);
+int         tdbEnvRgstDB(TENV* pEnv, TDB* pDb);
 
 #ifdef __cplusplus
 }