diff --git a/models/action.go b/models/action.go
index 8b3d82b4d..112e9ec7b 100644
--- a/models/action.go
+++ b/models/action.go
@@ -71,19 +71,19 @@ func init() {
 // used in template render.
 type Action struct {
 	ID           int64 `xorm:"pk autoincr"`
-	UserID       int64 // Receiver user id.
+	UserID       int64 `xorm:"INDEX"` // Receiver user id.
 	OpType       ActionType
-	ActUserID    int64  // Action user id.
+	ActUserID    int64  `xorm:"INDEX"` // Action user id.
 	ActUserName  string // Action user name.
 	ActAvatar    string `xorm:"-"`
-	RepoID       int64
+	RepoID       int64  `xorm:"INDEX"`
 	RepoUserName string
 	RepoName     string
 	RefName      string
-	IsPrivate    bool      `xorm:"NOT NULL DEFAULT false"`
+	IsPrivate    bool      `xorm:"INDEX NOT NULL DEFAULT false"`
 	Content      string    `xorm:"TEXT"`
 	Created      time.Time `xorm:"-"`
-	CreatedUnix  int64
+	CreatedUnix  int64     `xorm:"INDEX"`
 }
 
 // BeforeInsert will be invoked by XORM before inserting a record
diff --git a/models/admin.go b/models/admin.go
index 058e9be8a..9447ef67e 100644
--- a/models/admin.go
+++ b/models/admin.go
@@ -32,7 +32,7 @@ type Notice struct {
 	Type        NoticeType
 	Description string    `xorm:"TEXT"`
 	Created     time.Time `xorm:"-"`
-	CreatedUnix int64
+	CreatedUnix int64     `xorm:"INDEX"`
 }
 
 // BeforeInsert is invoked from XORM before inserting an object of this type.
diff --git a/models/issue.go b/models/issue.go
index 315c91e15..b8f23d594 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -34,29 +34,29 @@ type Issue struct {
 	RepoID          int64       `xorm:"INDEX UNIQUE(repo_index)"`
 	Repo            *Repository `xorm:"-"`
 	Index           int64       `xorm:"UNIQUE(repo_index)"` // Index in one repository.
-	PosterID        int64
-	Poster          *User    `xorm:"-"`
-	Title           string   `xorm:"name"`
-	Content         string   `xorm:"TEXT"`
-	RenderedContent string   `xorm:"-"`
-	Labels          []*Label `xorm:"-"`
-	MilestoneID     int64
-	Milestone       *Milestone `xorm:"-"`
+	PosterID        int64       `xorm:"INDEX"`
+	Poster          *User       `xorm:"-"`
+	Title           string      `xorm:"name"`
+	Content         string      `xorm:"TEXT"`
+	RenderedContent string      `xorm:"-"`
+	Labels          []*Label    `xorm:"-"`
+	MilestoneID     int64       `xorm:"INDEX"`
+	Milestone       *Milestone  `xorm:"-"`
 	Priority        int
-	AssigneeID      int64
-	Assignee        *User `xorm:"-"`
-	IsClosed        bool
+	AssigneeID      int64        `xorm:"INDEX"`
+	Assignee        *User        `xorm:"-"`
+	IsClosed        bool         `xorm:"INDEX"`
 	IsRead          bool         `xorm:"-"`
-	IsPull          bool         // Indicates whether is a pull request or not.
+	IsPull          bool         `xorm:"INDEX"` // Indicates whether is a pull request or not.
 	PullRequest     *PullRequest `xorm:"-"`
 	NumComments     int
 
 	Deadline     time.Time `xorm:"-"`
-	DeadlineUnix int64
+	DeadlineUnix int64     `xorm:"INDEX"`
 	Created      time.Time `xorm:"-"`
-	CreatedUnix  int64
+	CreatedUnix  int64     `xorm:"INDEX"`
 	Updated      time.Time `xorm:"-"`
-	UpdatedUnix  int64
+	UpdatedUnix  int64     `xorm:"INDEX"`
 
 	Attachments []*Attachment `xorm:"-"`
 	Comments    []*Comment    `xorm:"-"`
diff --git a/models/issue_comment.go b/models/issue_comment.go
index 22c1e8cf9..73c9db1cd 100644
--- a/models/issue_comment.go
+++ b/models/issue_comment.go
@@ -53,7 +53,7 @@ const (
 type Comment struct {
 	ID              int64 `xorm:"pk autoincr"`
 	Type            CommentType
-	PosterID        int64
+	PosterID        int64 `xorm:"INDEX"`
 	Poster          *User `xorm:"-"`
 	IssueID         int64 `xorm:"INDEX"`
 	CommitID        int64
@@ -62,9 +62,9 @@ type Comment struct {
 	RenderedContent string `xorm:"-"`
 
 	Created     time.Time `xorm:"-"`
-	CreatedUnix int64
+	CreatedUnix int64     `xorm:"INDEX"`
 	Updated     time.Time `xorm:"-"`
-	UpdatedUnix int64
+	UpdatedUnix int64     `xorm:"INDEX"`
 
 	// Reference issue in commit message
 	CommitSHA string `xorm:"VARCHAR(40)"`
diff --git a/models/login_source.go b/models/login_source.go
index 58e0e88b3..3fe5e172e 100644
--- a/models/login_source.go
+++ b/models/login_source.go
@@ -120,13 +120,13 @@ type LoginSource struct {
 	ID        int64 `xorm:"pk autoincr"`
 	Type      LoginType
 	Name      string          `xorm:"UNIQUE"`
-	IsActived bool            `xorm:"NOT NULL DEFAULT false"`
+	IsActived bool            `xorm:"INDEX NOT NULL DEFAULT false"`
 	Cfg       core.Conversion `xorm:"TEXT"`
 
 	Created     time.Time `xorm:"-"`
-	CreatedUnix int64
+	CreatedUnix int64     `xorm:"INDEX"`
 	Updated     time.Time `xorm:"-"`
-	UpdatedUnix int64
+	UpdatedUnix int64     `xorm:"INDEX"`
 }
 
 // BeforeInsert is invoked from XORM before inserting an object of this type.
diff --git a/models/org.go b/models/org.go
index 7fbd790f5..7d64d5a91 100644
--- a/models/org.go
+++ b/models/org.go
@@ -255,7 +255,7 @@ type OrgUser struct {
 	ID       int64 `xorm:"pk autoincr"`
 	UID      int64 `xorm:"INDEX UNIQUE(s)"`
 	OrgID    int64 `xorm:"INDEX UNIQUE(s)"`
-	IsPublic bool
+	IsPublic bool  `xorm:"INDEX"`
 	IsOwner  bool
 	NumTeams int
 }
diff --git a/models/pull.go b/models/pull.go
index 6231b71cb..8661fa3aa 100644
--- a/models/pull.go
+++ b/models/pull.go
@@ -54,21 +54,21 @@ type PullRequest struct {
 	Issue   *Issue `xorm:"-"`
 	Index   int64
 
-	HeadRepoID   int64
+	HeadRepoID   int64       `xorm:"INDEX"`
 	HeadRepo     *Repository `xorm:"-"`
-	BaseRepoID   int64
+	BaseRepoID   int64       `xorm:"INDEX"`
 	BaseRepo     *Repository `xorm:"-"`
 	HeadUserName string
 	HeadBranch   string
 	BaseBranch   string
 	MergeBase    string `xorm:"VARCHAR(40)"`
 
-	HasMerged      bool
-	MergedCommitID string `xorm:"VARCHAR(40)"`
-	MergerID       int64
+	HasMerged      bool      `xorm:"INDEX"`
+	MergedCommitID string    `xorm:"VARCHAR(40)"`
+	MergerID       int64     `xorm:"INDEX"`
 	Merger         *User     `xorm:"-"`
 	Merged         time.Time `xorm:"-"`
-	MergedUnix     int64
+	MergedUnix     int64     `xorm:"INDEX"`
 }
 
 // BeforeUpdate is invoked from XORM before updating an object of this type.
diff --git a/models/release.go b/models/release.go
index 28ba6c1d6..67ef81e21 100644
--- a/models/release.go
+++ b/models/release.go
@@ -23,11 +23,11 @@ import (
 // Release represents a release of repository.
 type Release struct {
 	ID               int64       `xorm:"pk autoincr"`
-	RepoID           int64       `xorm:"index unique(n)"`
+	RepoID           int64       `xorm:"INDEX UNIQUE(n)"`
 	Repo             *Repository `xorm:"-"`
-	PublisherID      int64
-	Publisher        *User  `xorm:"-"`
-	TagName          string `xorm:"index unique(n)"`
+	PublisherID      int64       `xorm:"INDEX"`
+	Publisher        *User       `xorm:"-"`
+	TagName          string      `xorm:"INDEX UNIQUE(n)"`
 	LowerTagName     string
 	Target           string
 	Title            string
@@ -39,7 +39,7 @@ type Release struct {
 	IsPrerelease     bool
 
 	Created     time.Time `xorm:"-"`
-	CreatedUnix int64
+	CreatedUnix int64     `xorm:"INDEX"`
 }
 
 // BeforeInsert is invoked from XORM before inserting an object of this type.
diff --git a/models/repo.go b/models/repo.go
index 85807e3a4..4acb0d736 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -193,10 +193,10 @@ type Repository struct {
 	NumOpenMilestones   int `xorm:"-"`
 	NumTags             int `xorm:"-"`
 
-	IsPrivate bool
-	IsBare    bool
+	IsPrivate bool `xorm:"INDEX"`
+	IsBare    bool `xorm:"INDEX"`
 
-	IsMirror bool
+	IsMirror bool `xorm:"INDEX"`
 	*Mirror  `xorm:"-"`
 
 	// Advanced settings
@@ -211,14 +211,14 @@ type Repository struct {
 	ExternalMetas         map[string]string `xorm:"-"`
 	EnablePulls           bool              `xorm:"NOT NULL DEFAULT true"`
 
-	IsFork   bool `xorm:"NOT NULL DEFAULT false"`
-	ForkID   int64
+	IsFork   bool        `xorm:"INDEX NOT NULL DEFAULT false"`
+	ForkID   int64       `xorm:"INDEX"`
 	BaseRepo *Repository `xorm:"-"`
 
 	Created     time.Time `xorm:"-"`
-	CreatedUnix int64
+	CreatedUnix int64     `xorm:"INDEX"`
 	Updated     time.Time `xorm:"-"`
-	UpdatedUnix int64
+	UpdatedUnix int64     `xorm:"INDEX"`
 }
 
 // BeforeInsert is invoked from XORM before inserting an object of this type.
diff --git a/models/repo_mirror.go b/models/repo_mirror.go
index 2cedf69d7..abe70de1a 100644
--- a/models/repo_mirror.go
+++ b/models/repo_mirror.go
@@ -24,16 +24,16 @@ var MirrorQueue = sync.NewUniqueQueue(setting.Repository.MirrorQueueLength)
 
 // Mirror represents mirror information of a repository.
 type Mirror struct {
-	ID          int64 `xorm:"pk autoincr"`
-	RepoID      int64
+	ID          int64       `xorm:"pk autoincr"`
+	RepoID      int64       `xorm:"INDEX"`
 	Repo        *Repository `xorm:"-"`
 	Interval    int         // Hour.
 	EnablePrune bool        `xorm:"NOT NULL DEFAULT true"`
 
 	Updated        time.Time `xorm:"-"`
-	UpdatedUnix    int64
+	UpdatedUnix    int64     `xorm:"INDEX"`
 	NextUpdate     time.Time `xorm:"-"`
-	NextUpdateUnix int64
+	NextUpdateUnix int64     `xorm:"INDEX"`
 
 	address string `xorm:"-"`
 }
diff --git a/models/token.go b/models/token.go
index 6b2898a49..b2e0a28a5 100644
--- a/models/token.go
+++ b/models/token.go
@@ -21,11 +21,11 @@ type AccessToken struct {
 	Sha1 string `xorm:"UNIQUE VARCHAR(40)"`
 
 	Created           time.Time `xorm:"-"`
-	CreatedUnix       int64
+	CreatedUnix       int64     `xorm:"INDEX"`
 	Updated           time.Time `xorm:"-"` // Note: Updated must below Created for AfterSet.
-	UpdatedUnix       int64
-	HasRecentActivity bool `xorm:"-"`
-	HasUsed           bool `xorm:"-"`
+	UpdatedUnix       int64     `xorm:"INDEX"`
+	HasRecentActivity bool      `xorm:"-"`
+	HasUsed           bool      `xorm:"-"`
 }
 
 // BeforeInsert will be invoked by XORM before inserting a record representing this object.
diff --git a/models/user.go b/models/user.go
index 1dbd63dce..201d8c48f 100644
--- a/models/user.go
+++ b/models/user.go
@@ -90,11 +90,11 @@ type User struct {
 	Salt        string `xorm:"VARCHAR(10)"`
 
 	Created       time.Time `xorm:"-"`
-	CreatedUnix   int64
+	CreatedUnix   int64     `xorm:"INDEX"`
 	Updated       time.Time `xorm:"-"`
-	UpdatedUnix   int64
+	UpdatedUnix   int64     `xorm:"INDEX"`
 	LastLogin     time.Time `xorm:"-"`
-	LastLoginUnix int64
+	LastLoginUnix int64     `xorm:"INDEX"`
 
 	// Remember visibility choice for convenience, true for private
 	LastRepoVisibility bool
@@ -102,7 +102,7 @@ type User struct {
 	MaxRepoCreation int `xorm:"NOT NULL DEFAULT -1"`
 
 	// Permissions
-	IsActive                bool // Activate primary email
+	IsActive                bool `xorm:"INDEX"` // Activate primary email
 	IsAdmin                 bool
 	AllowGitHook            bool
 	AllowImportLocal        bool // Allow migrate repository by local path
diff --git a/models/webhook.go b/models/webhook.go
index 2da88de2a..c9c3c21a4 100644
--- a/models/webhook.go
+++ b/models/webhook.go
@@ -91,24 +91,24 @@ const (
 
 // Webhook represents a web hook object.
 type Webhook struct {
-	ID           int64 `xorm:"pk autoincr"`
-	RepoID       int64
-	OrgID        int64
+	ID           int64  `xorm:"pk autoincr"`
+	RepoID       int64  `xorm:"INDEX"`
+	OrgID        int64  `xorm:"INDEX"`
 	URL          string `xorm:"url TEXT"`
 	ContentType  HookContentType
 	Secret       string `xorm:"TEXT"`
 	Events       string `xorm:"TEXT"`
 	*HookEvent   `xorm:"-"`
 	IsSSL        bool `xorm:"is_ssl"`
-	IsActive     bool
+	IsActive     bool `xorm:"INDEX"`
 	HookTaskType HookTaskType
 	Meta         string     `xorm:"TEXT"` // store hook-specific attributes
 	LastStatus   HookStatus // Last delivery status
 
 	Created     time.Time `xorm:"-"`
-	CreatedUnix int64
+	CreatedUnix int64     `xorm:"INDEX"`
 	Updated     time.Time `xorm:"-"`
-	UpdatedUnix int64
+	UpdatedUnix int64     `xorm:"INDEX"`
 }
 
 // BeforeInsert will be invoked by XORM before inserting a record