diff --git a/ddl/index.go b/ddl/index.go
index fdba6c65008f6..622e93213929c 100644
--- a/ddl/index.go
+++ b/ddl/index.go
@@ -1217,10 +1217,9 @@ func (w *worker) updateReorgInfo(t table.PartitionedTable, reorg *reorgInfo) (bo
 
 	failpoint.Inject("mockUpdateCachedSafePoint", func(val failpoint.Value) {
 		if val.(bool) {
-			// 18 is for the logical time.
-			ts := oracle.GetPhysical(time.Now()) << 18
+			ts := oracle.GoTimeToTS(time.Now())
 			s := reorg.d.store.(tikv.Storage)
-			s.UpdateSPCache(uint64(ts), time.Now())
+			s.UpdateSPCache(ts, time.Now())
 			time.Sleep(time.Millisecond * 3)
 		}
 	})
diff --git a/domain/domain_test.go b/domain/domain_test.go
index 51e0948d30715..099e3234c8279 100644
--- a/domain/domain_test.go
+++ b/domain/domain_test.go
@@ -287,7 +287,7 @@ func (*testSuite) TestT(c *C) {
 	c.Assert(dd, NotNil)
 	c.Assert(dd.GetLease(), Equals, 80*time.Millisecond)
 
-	snapTS := oracle.EncodeTSO(oracle.GetPhysical(time.Now()))
+	snapTS := oracle.GoTimeToTS(time.Now())
 	cs := &ast.CharsetOpt{
 		Chs: "utf8",
 		Col: "utf8_bin",
@@ -317,7 +317,7 @@ func (*testSuite) TestT(c *C) {
 	c.Assert(err, IsNil)
 
 	// for GetSnapshotInfoSchema
-	currSnapTS := oracle.EncodeTSO(oracle.GetPhysical(time.Now()))
+	currSnapTS := oracle.GoTimeToTS(time.Now())
 	currSnapIs, err := dom.GetSnapshotInfoSchema(currSnapTS)
 	c.Assert(err, IsNil)
 	c.Assert(currSnapIs, NotNil)
diff --git a/domain/infosync/info.go b/domain/infosync/info.go
index be8d80246e96b..a94a15fb7e212 100644
--- a/domain/infosync/info.go
+++ b/domain/infosync/info.go
@@ -559,7 +559,7 @@ func (is *InfoSyncer) ReportMinStartTS(store kv.Storage) {
 		logutil.BgLogger().Error("update minStartTS failed", zap.Error(err))
 		return
 	}
-	now := time.Unix(0, oracle.ExtractPhysical(currentVer.Ver)*1e6)
+	now := oracle.GetTimeFromTS(currentVer.Ver)
 	startTSLowerLimit := oracle.GoTimeToLowerLimitStartTS(now, tikv.MaxTxnTimeUse)
 
 	minStartTS := oracle.GoTimeToTS(now)
diff --git a/executor/executor_test.go b/executor/executor_test.go
index ab6dc6f274712..8836b4f59fbd3 100644
--- a/executor/executor_test.go
+++ b/executor/executor_test.go
@@ -2727,7 +2727,7 @@ func (s *testSuiteP2) TestHistoryRead(c *C) {
 	tk.MustQuery("select * from history_read order by a").Check(testkit.Rows("2 <nil>", "4 <nil>", "8 8", "9 9"))
 	tk.MustExec("set @@tidb_snapshot = '" + snapshotTime.Format("2006-01-02 15:04:05.999999") + "'")
 	tk.MustQuery("select * from history_read order by a").Check(testkit.Rows("2", "4"))
-	tsoStr := strconv.FormatUint(oracle.EncodeTSO(snapshotTime.UnixNano()/int64(time.Millisecond)), 10)
+	tsoStr := strconv.FormatUint(oracle.GoTimeToTS(snapshotTime), 10)
 
 	tk.MustExec("set @@tidb_snapshot = '" + tsoStr + "'")
 	tk.MustQuery("select * from history_read order by a").Check(testkit.Rows("2", "4"))
diff --git a/executor/show_stats.go b/executor/show_stats.go
index 3a1cf0cb48adc..b6449863b0c1f 100644
--- a/executor/show_stats.go
+++ b/executor/show_stats.go
@@ -17,7 +17,6 @@ import (
 	"fmt"
 	"sort"
 	"strings"
-	"time"
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/parser/ast"
@@ -203,7 +202,7 @@ func (e *ShowExec) histogramToRow(dbName, tblName, partitionName, colName string
 }
 
 func (e *ShowExec) versionToTime(version uint64) types.Time {
-	t := time.Unix(0, oracle.ExtractPhysical(version)*int64(time.Millisecond))
+	t := oracle.GetTimeFromTS(version)
 	return types.NewTime(types.FromGoTime(t), mysql.TypeDatetime, 0)
 }
 
diff --git a/executor/simple.go b/executor/simple.go
index d1e5181e2f439..3c45ee05ada4e 100644
--- a/executor/simple.go
+++ b/executor/simple.go
@@ -632,7 +632,7 @@ func (e *SimpleExec) executeStartTransactionReadOnlyWithTimestampBound(ctx conte
 		if err != nil {
 			return err
 		}
-		startTS := oracle.ComposeTS(gt.Unix()*1000, 0)
+		startTS := oracle.GoTimeToTS(gt)
 		opt.StartTS = startTS
 	case ast.TimestampBoundExactStaleness:
 		// TODO: support funcCallExpr in future
@@ -668,7 +668,7 @@ func (e *SimpleExec) executeStartTransactionReadOnlyWithTimestampBound(ctx conte
 		if err != nil {
 			return err
 		}
-		startTS := oracle.ComposeTS(gt.Unix()*1000, 0)
+		startTS := oracle.GoTimeToTS(gt)
 		opt.StartTS = startTS
 	}
 	err := e.ctx.NewTxnWithStalenessOption(ctx, opt)
diff --git a/executor/stale_txn_test.go b/executor/stale_txn_test.go
index 64b334b15bf94..db2b55a9a1637 100644
--- a/executor/stale_txn_test.go
+++ b/executor/stale_txn_test.go
@@ -196,8 +196,7 @@ func (s *testStaleTxnSerialSuite) TestTimeBoundedStalenessTxn(c *C) {
 			name: "max 20 seconds ago, safeTS 10 secs ago",
 			sql:  `START TRANSACTION READ ONLY WITH TIMESTAMP BOUND MAX STALENESS '00:00:20'`,
 			injectSafeTS: func() uint64 {
-				phy := time.Now().Add(-10*time.Second).Unix() * 1000
-				return oracle.ComposeTS(phy, 0)
+				return oracle.GoTimeToTS(time.Now().Add(-10 * time.Second))
 			}(),
 			useSafeTS: true,
 		},
@@ -205,8 +204,7 @@ func (s *testStaleTxnSerialSuite) TestTimeBoundedStalenessTxn(c *C) {
 			name: "max 10 seconds ago, safeTS 20 secs ago",
 			sql:  `START TRANSACTION READ ONLY WITH TIMESTAMP BOUND MAX STALENESS '00:00:10'`,
 			injectSafeTS: func() uint64 {
-				phy := time.Now().Add(-20*time.Second).Unix() * 1000
-				return oracle.ComposeTS(phy, 0)
+				return oracle.GoTimeToTS(time.Now().Add(-20 * time.Second))
 			}(),
 			useSafeTS: false,
 		},
@@ -217,8 +215,7 @@ func (s *testStaleTxnSerialSuite) TestTimeBoundedStalenessTxn(c *C) {
 					time.Now().Add(-20*time.Second).Format("2006-01-02 15:04:05"))
 			}(),
 			injectSafeTS: func() uint64 {
-				phy := time.Now().Add(-10*time.Second).Unix() * 1000
-				return oracle.ComposeTS(phy, 0)
+				return oracle.GoTimeToTS(time.Now().Add(-10 * time.Second))
 			}(),
 			useSafeTS: true,
 		},
@@ -229,8 +226,7 @@ func (s *testStaleTxnSerialSuite) TestTimeBoundedStalenessTxn(c *C) {
 					time.Now().Add(-10*time.Second).Format("2006-01-02 15:04:05"))
 			}(),
 			injectSafeTS: func() uint64 {
-				phy := time.Now().Add(-20*time.Second).Unix() * 1000
-				return oracle.ComposeTS(phy, 0)
+				return oracle.GoTimeToTS(time.Now().Add(-20 * time.Second))
 			}(),
 			useSafeTS: false,
 		},
diff --git a/statistics/handle/update_test.go b/statistics/handle/update_test.go
index a1de28e78eeef..a8924021c5846 100644
--- a/statistics/handle/update_test.go
+++ b/statistics/handle/update_test.go
@@ -1453,7 +1453,7 @@ func (s *testStatsSuite) TestNeedAnalyzeTable(c *C) {
 	}{
 		// table was never analyzed and has reach the limit
 		{
-			tbl:    &statistics.Table{Version: oracle.EncodeTSO(oracle.GetPhysical(time.Now()))},
+			tbl:    &statistics.Table{Version: oracle.GoTimeToTS(time.Now())},
 			limit:  0,
 			ratio:  0,
 			start:  "00:00 +0800",
@@ -1464,7 +1464,7 @@ func (s *testStatsSuite) TestNeedAnalyzeTable(c *C) {
 		},
 		// table was never analyzed but has not reach the limit
 		{
-			tbl:    &statistics.Table{Version: oracle.EncodeTSO(oracle.GetPhysical(time.Now()))},
+			tbl:    &statistics.Table{Version: oracle.GoTimeToTS(time.Now())},
 			limit:  time.Hour,
 			ratio:  0,
 			start:  "00:00 +0800",
diff --git a/store/gcworker/gc_worker_test.go b/store/gcworker/gc_worker_test.go
index 39abe369f82fb..2beef12da62c0 100644
--- a/store/gcworker/gc_worker_test.go
+++ b/store/gcworker/gc_worker_test.go
@@ -259,10 +259,10 @@ func (s *testGCWorkerSuite) TestMinStartTS(c *C) {
 		strconv.FormatUint(now, 10))
 	c.Assert(err, IsNil)
 	err = spkv.Put(fmt.Sprintf("%s/%s", infosync.ServerMinStartTSPath, "b"),
-		strconv.FormatUint(now-oracle.EncodeTSO(20000), 10))
+		strconv.FormatUint(now-oracle.ComposeTS(20000, 0), 10))
 	c.Assert(err, IsNil)
-	sp = s.gcWorker.calcSafePointByMinStartTS(ctx, now-oracle.EncodeTSO(10000))
-	c.Assert(sp, Equals, now-oracle.EncodeTSO(20000)-1)
+	sp = s.gcWorker.calcSafePointByMinStartTS(ctx, now-oracle.ComposeTS(10000, 0))
+	c.Assert(sp, Equals, now-oracle.ComposeTS(20000, 0)-1)
 }
 
 func (s *testGCWorkerSuite) TestPrepareGC(c *C) {
diff --git a/store/tikv/2pc.go b/store/tikv/2pc.go
index 14609f5f77400..c01d97981dd09 100644
--- a/store/tikv/2pc.go
+++ b/store/tikv/2pc.go
@@ -1428,7 +1428,7 @@ func (c *twoPhaseCommitter) checkSchemaValid(ctx context.Context, checkTS uint64
 
 func (c *twoPhaseCommitter) calculateMaxCommitTS(ctx context.Context) error {
 	// Amend txn with current time first, then we can make sure we have another SafeWindow time to commit
-	currentTS := oracle.EncodeTSO(int64(time.Since(c.txn.startTime)/time.Millisecond)) + c.startTS
+	currentTS := oracle.ComposeTS(int64(time.Since(c.txn.startTime)/time.Millisecond), 0) + c.startTS
 	_, _, err := c.checkSchemaValid(ctx, currentTS, c.txn.schemaVer, true)
 	if err != nil {
 		logutil.Logger(ctx).Info("Schema changed for async commit txn",
@@ -1438,7 +1438,7 @@ func (c *twoPhaseCommitter) calculateMaxCommitTS(ctx context.Context) error {
 	}
 
 	safeWindow := config.GetGlobalConfig().TiKVClient.AsyncCommit.SafeWindow
-	maxCommitTS := oracle.EncodeTSO(int64(safeWindow/time.Millisecond)) + currentTS
+	maxCommitTS := oracle.ComposeTS(int64(safeWindow/time.Millisecond), 0) + currentTS
 	logutil.BgLogger().Debug("calculate MaxCommitTS",
 		zap.Time("startTime", c.txn.startTime),
 		zap.Duration("safeWindow", safeWindow),
diff --git a/store/tikv/latch/latch_test.go b/store/tikv/latch/latch_test.go
index 4b10c118883a6..ce53794d44f12 100644
--- a/store/tikv/latch/latch_test.go
+++ b/store/tikv/latch/latch_test.go
@@ -110,7 +110,7 @@ func (s *testLatchSuite) TestFirstAcquireFailedWithStale(c *C) {
 func (s *testLatchSuite) TestRecycle(c *C) {
 	latches := NewLatches(8)
 	now := time.Now()
-	startTS := oracle.ComposeTS(oracle.GetPhysical(now), 0)
+	startTS := oracle.GoTimeToTS(now)
 	lock := latches.genLock(startTS, [][]byte{
 		[]byte("a"), []byte("b"),
 	})
@@ -142,7 +142,7 @@ func (s *testLatchSuite) TestRecycle(c *C) {
 	}
 	c.Assert(allEmpty, IsFalse)
 
-	currentTS := oracle.ComposeTS(oracle.GetPhysical(now.Add(expireDuration)), 3)
+	currentTS := oracle.GoTimeToTS(now.Add(expireDuration)) + 3
 	latches.recycle(currentTS)
 
 	for i := 0; i < len(latches.slots); i++ {
diff --git a/store/tikv/oracle/oracle.go b/store/tikv/oracle/oracle.go
index 1b08129d412aa..fd95f1b357013 100644
--- a/store/tikv/oracle/oracle.go
+++ b/store/tikv/oracle/oracle.go
@@ -16,10 +16,6 @@ package oracle
 import (
 	"context"
 	"time"
-
-	"github.com/pingcap/failpoint"
-	"github.com/pingcap/tidb/store/tikv/logutil"
-	"go.uber.org/zap"
 )
 
 // Option represents available options for the oracle.Oracle.
@@ -53,19 +49,6 @@ const (
 
 // ComposeTS creates a ts from physical and logical parts.
 func ComposeTS(physical, logical int64) uint64 {
-	failpoint.Inject("changeTSFromPD", func(val failpoint.Value) {
-		valInt, ok := val.(int)
-		if ok {
-			origPhyTS := physical
-			logical := logical
-			newPhyTs := origPhyTS + int64(valInt)
-			origTS := uint64((physical << physicalShiftBits) + logical)
-			newTS := uint64((newPhyTs << physicalShiftBits) + logical)
-			logutil.BgLogger().Warn("ComposeTS failpoint", zap.Uint64("origTS", origTS),
-				zap.Int("valInt", valInt), zap.Uint64("ts", newTS))
-			failpoint.Return(newTS)
-		}
-	})
 	return uint64((physical << physicalShiftBits) + logical)
 }
 
@@ -84,11 +67,6 @@ func GetPhysical(t time.Time) int64 {
 	return t.UnixNano() / int64(time.Millisecond)
 }
 
-// EncodeTSO encodes a millisecond into tso.
-func EncodeTSO(ts int64) uint64 {
-	return uint64(ts) << physicalShiftBits
-}
-
 // GetTimeFromTS extracts time.Time from a timestamp.
 func GetTimeFromTS(ts uint64) time.Time {
 	ms := ExtractPhysical(ts)
diff --git a/store/tikv/oracle/oracles/local.go b/store/tikv/oracle/oracles/local.go
index 4fcd7cbc51d78..8c7f8a30de645 100644
--- a/store/tikv/oracle/oracles/local.go
+++ b/store/tikv/oracle/oracles/local.go
@@ -42,7 +42,8 @@ func (l *localOracle) IsExpired(lockTS, TTL uint64, _ *oracle.Option) bool {
 	if l.hook != nil {
 		now = l.hook.currentTime
 	}
-	return oracle.GetPhysical(now) >= oracle.ExtractPhysical(lockTS)+int64(TTL)
+	expire := oracle.GetTimeFromTS(lockTS).Add(time.Duration(TTL) * time.Millisecond)
+	return !now.Before(expire)
 }
 
 func (l *localOracle) GetTimestamp(ctx context.Context, _ *oracle.Option) (uint64, error) {
@@ -52,8 +53,7 @@ func (l *localOracle) GetTimestamp(ctx context.Context, _ *oracle.Option) (uint6
 	if l.hook != nil {
 		now = l.hook.currentTime
 	}
-	physical := oracle.GetPhysical(now)
-	ts := oracle.ComposeTS(physical, 0)
+	ts := oracle.GoTimeToTS(now)
 	if l.lastTimeStampTS == ts {
 		l.n++
 		return ts + l.n, nil
@@ -80,9 +80,7 @@ func (l *localOracle) GetLowResolutionTimestampAsync(ctx context.Context, opt *o
 
 // GetStaleTimestamp return physical
 func (l *localOracle) GetStaleTimestamp(ctx context.Context, txnScope string, prevSecond uint64) (ts uint64, err error) {
-	physical := oracle.GetPhysical(time.Now().Add(-time.Second * time.Duration(prevSecond)))
-	ts = oracle.ComposeTS(physical, 0)
-	return ts, nil
+	return oracle.GoTimeToTS(time.Now().Add(-time.Second * time.Duration(prevSecond))), nil
 }
 
 type future struct {
diff --git a/store/tikv/oracle/oracles/mock.go b/store/tikv/oracle/oracles/mock.go
index 2afd962fb5c42..b1eabe57feb37 100644
--- a/store/tikv/oracle/oracles/mock.go
+++ b/store/tikv/oracle/oracles/mock.go
@@ -62,9 +62,8 @@ func (o *MockOracle) GetTimestamp(ctx context.Context, _ *oracle.Option) (uint64
 	if o.stop {
 		return 0, errors.Trace(errStopped)
 	}
-	physical := oracle.GetPhysical(time.Now().Add(o.offset))
-	ts := oracle.ComposeTS(physical, 0)
-	if oracle.ExtractPhysical(o.lastTS) == physical {
+	ts := oracle.GoTimeToTS(time.Now().Add(o.offset))
+	if oracle.ExtractPhysical(o.lastTS) == oracle.ExtractPhysical(ts) {
 		ts = o.lastTS + 1
 	}
 	o.lastTS = ts
@@ -73,9 +72,7 @@ func (o *MockOracle) GetTimestamp(ctx context.Context, _ *oracle.Option) (uint64
 
 // GetStaleTimestamp implements oracle.Oracle interface.
 func (o *MockOracle) GetStaleTimestamp(ctx context.Context, txnScope string, prevSecond uint64) (ts uint64, err error) {
-	physical := oracle.GetPhysical(time.Now().Add(-time.Second * time.Duration(prevSecond)))
-	ts = oracle.ComposeTS(physical, 0)
-	return ts, nil
+	return oracle.GoTimeToTS(time.Now().Add(-time.Second * time.Duration(prevSecond))), nil
 }
 
 type mockOracleFuture struct {
@@ -106,15 +103,16 @@ func (o *MockOracle) GetLowResolutionTimestampAsync(ctx context.Context, opt *or
 func (o *MockOracle) IsExpired(lockTimestamp, TTL uint64, _ *oracle.Option) bool {
 	o.RLock()
 	defer o.RUnlock()
-
-	return oracle.GetPhysical(time.Now().Add(o.offset)) >= oracle.ExtractPhysical(lockTimestamp)+int64(TTL)
+	expire := oracle.GetTimeFromTS(lockTimestamp).Add(time.Duration(TTL) * time.Millisecond)
+	return !time.Now().Add(o.offset).Before(expire)
 }
 
 // UntilExpired implement oracle.Oracle interface.
 func (o *MockOracle) UntilExpired(lockTimeStamp, TTL uint64, _ *oracle.Option) int64 {
 	o.RLock()
 	defer o.RUnlock()
-	return oracle.ExtractPhysical(lockTimeStamp) + int64(TTL) - oracle.GetPhysical(time.Now().Add(o.offset))
+	expire := oracle.GetTimeFromTS(lockTimeStamp).Add(time.Duration(TTL) * time.Millisecond)
+	return expire.Sub(time.Now().Add(o.offset)).Milliseconds()
 }
 
 // Close implements oracle.Oracle interface.
diff --git a/store/tikv/oracle/oracles/pd.go b/store/tikv/oracle/oracles/pd.go
index 063f73e343ce0..907dc278d71cb 100644
--- a/store/tikv/oracle/oracles/pd.go
+++ b/store/tikv/oracle/oracles/pd.go
@@ -135,7 +135,7 @@ func (o *pdOracle) getTimestamp(ctx context.Context, txnScope string) (uint64, e
 }
 
 func (o *pdOracle) getArrivalTimestamp() uint64 {
-	return oracle.ComposeTS(oracle.GetPhysical(time.Now()), 0)
+	return oracle.GoTimeToTS(time.Now())
 }
 
 func (o *pdOracle) setLastTS(ts uint64, txnScope string) {
@@ -288,7 +288,7 @@ func (o *pdOracle) getStaleTimestamp(txnScope string, prevSecond uint64) (uint64
 
 	staleTime := physicalTime.Add(-arrivalTime.Sub(time.Now().Add(-time.Duration(prevSecond) * time.Second)))
 
-	return oracle.ComposeTS(oracle.GetPhysical(staleTime), 0), nil
+	return oracle.GoTimeToTS(staleTime), nil
 }
 
 // GetStaleTimestamp generate a TSO which represents for the TSO prevSecond secs ago.
diff --git a/store/tikv/oracle/oracles/pd_test.go b/store/tikv/oracle/oracles/pd_test.go
index 4e881a82126b5..2894a782e505f 100644
--- a/store/tikv/oracle/oracles/pd_test.go
+++ b/store/tikv/oracle/oracles/pd_test.go
@@ -36,8 +36,8 @@ func (s *testPDSuite) TestPDOracle_UntilExpired(c *C) {
 	lockAfter, lockExp := 10, 15
 	o := oracles.NewEmptyPDOracle()
 	start := time.Now()
-	oracles.SetEmptyPDOracleLastTs(o, oracle.ComposeTS(oracle.GetPhysical(start), 0))
-	lockTs := oracle.ComposeTS(oracle.GetPhysical(start.Add(time.Duration(lockAfter)*time.Millisecond)), 1)
+	oracles.SetEmptyPDOracleLastTs(o, oracle.GoTimeToTS(start))
+	lockTs := oracle.GoTimeToTS((start.Add(time.Duration(lockAfter) * time.Millisecond))) + 1
 	waitTs := o.UntilExpired(lockTs, uint64(lockExp), &oracle.Option{TxnScope: oracle.GlobalTxnScope})
 	c.Assert(waitTs, Equals, int64(lockAfter+lockExp), Commentf("waitTs shoulb be %d but got %d", int64(lockAfter+lockExp), waitTs))
 }
@@ -45,7 +45,7 @@ func (s *testPDSuite) TestPDOracle_UntilExpired(c *C) {
 func (s *testPDSuite) TestPdOracle_GetStaleTimestamp(c *C) {
 	o := oracles.NewEmptyPDOracle()
 	start := time.Now()
-	oracles.SetEmptyPDOracleLastTs(o, oracle.ComposeTS(oracle.GetPhysical(start), 0))
+	oracles.SetEmptyPDOracleLastTs(o, oracle.GoTimeToTS(start))
 	ts, err := o.GetStaleTimestamp(context.Background(), oracle.GlobalTxnScope, 10)
 	c.Assert(err, IsNil)
 
@@ -75,7 +75,7 @@ func (s *testPDSuite) TestPdOracle_GetStaleTimestamp(c *C) {
 	for _, testcase := range testcases {
 		comment := Commentf("%s", testcase.name)
 		start = time.Now()
-		oracles.SetEmptyPDOracleLastTs(o, oracle.ComposeTS(oracle.GetPhysical(start), 0))
+		oracles.SetEmptyPDOracleLastTs(o, oracle.GoTimeToTS(start))
 		ts, err = o.GetStaleTimestamp(context.Background(), oracle.GlobalTxnScope, testcase.preSec)
 		if testcase.expectErr == "" {
 			c.Assert(err, IsNil, comment)
diff --git a/store/tikv/tests/2pc_test.go b/store/tikv/tests/2pc_test.go
index 43b682160c514..12aa9466a3837 100644
--- a/store/tikv/tests/2pc_test.go
+++ b/store/tikv/tests/2pc_test.go
@@ -724,7 +724,7 @@ func (s *testCommitterSuite) TestPessimisticLockReturnValues(c *C) {
 func (s *testCommitterSuite) TestElapsedTTL(c *C) {
 	key := []byte("key")
 	txn := s.begin(c)
-	txn.SetStartTS(oracle.ComposeTS(oracle.GetPhysical(time.Now().Add(time.Second*10)), 1))
+	txn.SetStartTS(oracle.GoTimeToTS(time.Now().Add(time.Second*10)) + 1)
 	txn.SetPessimistic(true)
 	time.Sleep(time.Millisecond * 100)
 	lockCtx := &kv.LockCtx{
diff --git a/store/tikv/tests/store_test.go b/store/tikv/tests/store_test.go
index 659dc6ea8f226..f8055a96e4fb9 100644
--- a/store/tikv/tests/store_test.go
+++ b/store/tikv/tests/store_test.go
@@ -19,7 +19,6 @@ import (
 	"time"
 
 	. "github.com/pingcap/check"
-	"github.com/pingcap/failpoint"
 	pb "github.com/pingcap/kvproto/pkg/kvrpcpb"
 	"github.com/pingcap/tidb/store/tikv"
 	"github.com/pingcap/tidb/store/tikv/oracle"
@@ -154,20 +153,3 @@ func (s *testStoreSuite) TestRequestPriority(c *C) {
 	}
 	iter.Close()
 }
-
-func (s *testStoreSerialSuite) TestOracleChangeByFailpoint(c *C) {
-	defer func() {
-		failpoint.Disable("github.com/pingcap/tidb/store/tikv/oracle/changeTSFromPD")
-	}()
-	c.Assert(failpoint.Enable("github.com/pingcap/tidb/store/tikv/oracle/changeTSFromPD",
-		"return(10000)"), IsNil)
-	o := &oracles.MockOracle{}
-	s.store.SetOracle(o)
-	ctx := context.Background()
-	t1, err := s.store.GetTimestampWithRetry(tikv.NewBackofferWithVars(ctx, 100, nil), oracle.GlobalTxnScope)
-	c.Assert(err, IsNil)
-	c.Assert(failpoint.Disable("github.com/pingcap/tidb/store/tikv/oracle/changeTSFromPD"), IsNil)
-	t2, err := s.store.GetTimestampWithRetry(tikv.NewBackofferWithVars(ctx, 100, nil), oracle.GlobalTxnScope)
-	c.Assert(err, IsNil)
-	c.Assert(t1, Greater, t2)
-}