diff --git a/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/SpannerDatabaseAdminProto.java b/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/SpannerDatabaseAdminProto.java
index 9af8119d2c..032a813e29 100644
--- a/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/SpannerDatabaseAdminProto.java
+++ b/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/SpannerDatabaseAdminProto.java
@@ -147,149 +147,149 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
           + "baseDdlRequest\0229\n\010database\030\001 \001(\tB\'\340A\002\372A!"
           + "\n\037spanner.googleapis.com/Database\022\027\n\nsta"
           + "tements\030\002 \003(\tB\003\340A\002\022\024\n\014operation_id\030\003 \001(\t"
-          + "\"\236\001\n\031UpdateDatabaseDdlMetadata\0226\n\010databa"
+          + "\"\266\001\n\031UpdateDatabaseDdlMetadata\0226\n\010databa"
           + "se\030\001 \001(\tB$\372A!\n\037spanner.googleapis.com/Da"
           + "tabase\022\022\n\nstatements\030\002 \003(\t\0225\n\021commit_tim"
           + "estamps\030\003 \003(\0132\032.google.protobuf.Timestam"
-          + "p\"P\n\023DropDatabaseRequest\0229\n\010database\030\001 \001"
-          + "(\tB\'\340A\002\372A!\n\037spanner.googleapis.com/Datab"
-          + "ase\"R\n\025GetDatabaseDdlRequest\0229\n\010database"
-          + "\030\001 \001(\tB\'\340A\002\372A!\n\037spanner.googleapis.com/D"
-          + "atabase\",\n\026GetDatabaseDdlResponse\022\022\n\nsta"
-          + "tements\030\001 \003(\t\"\217\001\n\035ListDatabaseOperations"
-          + "Request\0227\n\006parent\030\001 \001(\tB\'\340A\002\372A!\n\037spanner"
-          + ".googleapis.com/Instance\022\016\n\006filter\030\002 \001(\t"
-          + "\022\021\n\tpage_size\030\003 \001(\005\022\022\n\npage_token\030\004 \001(\t\""
-          + "l\n\036ListDatabaseOperationsResponse\0221\n\nope"
-          + "rations\030\001 \003(\0132\035.google.longrunning.Opera"
-          + "tion\022\027\n\017next_page_token\030\002 \001(\t\"\253\001\n\026Restor"
-          + "eDatabaseRequest\0227\n\006parent\030\001 \001(\tB\'\340A\002\372A!"
-          + "\n\037spanner.googleapis.com/Instance\022\030\n\013dat"
-          + "abase_id\030\002 \001(\tB\003\340A\002\0224\n\006backup\030\003 \001(\tB\"\372A\037"
-          + "\n\035spanner.googleapis.com/BackupH\000B\010\n\006sou"
-          + "rce\"\347\002\n\027RestoreDatabaseMetadata\022\014\n\004name\030"
-          + "\001 \001(\t\022H\n\013source_type\030\002 \001(\01623.google.span"
-          + "ner.admin.database.v1.RestoreSourceType\022"
-          + "C\n\013backup_info\030\003 \001(\0132,.google.spanner.ad"
-          + "min.database.v1.BackupInfoH\000\022E\n\010progress"
-          + "\030\004 \001(\01323.google.spanner.admin.database.v"
-          + "1.OperationProgress\022/\n\013cancel_time\030\005 \001(\013"
-          + "2\032.google.protobuf.Timestamp\022(\n optimize"
-          + "_database_operation_name\030\006 \001(\tB\r\n\013source"
-          + "_info\"w\n OptimizeRestoredDatabaseMetadat"
-          + "a\022\014\n\004name\030\001 \001(\t\022E\n\010progress\030\002 \001(\01323.goog"
-          + "le.spanner.admin.database.v1.OperationPr"
-          + "ogress*5\n\021RestoreSourceType\022\024\n\020TYPE_UNSP"
-          + "ECIFIED\020\000\022\n\n\006BACKUP\020\0012\223\037\n\rDatabaseAdmin\022"
-          + "\300\001\n\rListDatabases\0226.google.spanner.admin"
-          + ".database.v1.ListDatabasesRequest\0327.goog"
-          + "le.spanner.admin.database.v1.ListDatabas"
-          + "esResponse\">\202\323\344\223\002/\022-/v1/{parent=projects"
-          + "/*/instances/*}/databases\332A\006parent\022\244\002\n\016C"
-          + "reateDatabase\0227.google.spanner.admin.dat"
-          + "abase.v1.CreateDatabaseRequest\032\035.google."
-          + "longrunning.Operation\"\271\001\202\323\344\223\0022\"-/v1/{par"
-          + "ent=projects/*/instances/*}/databases:\001*"
-          + "\332A\027parent,create_statement\312Ad\n)google.sp"
-          + "anner.admin.database.v1.Database\0227google"
-          + ".spanner.admin.database.v1.CreateDatabas"
-          + "eMetadata\022\255\001\n\013GetDatabase\0224.google.spann"
-          + "er.admin.database.v1.GetDatabaseRequest\032"
-          + "*.google.spanner.admin.database.v1.Datab"
-          + "ase\"<\202\323\344\223\002/\022-/v1/{name=projects/*/instan"
-          + "ces/*/databases/*}\332A\004name\022\235\002\n\021UpdateData"
-          + "baseDdl\022:.google.spanner.admin.database."
-          + "v1.UpdateDatabaseDdlRequest\032\035.google.lon"
-          + "grunning.Operation\"\254\001\202\323\344\223\002:25/v1/{databa"
-          + "se=projects/*/instances/*/databases/*}/d"
-          + "dl:\001*\332A\023database,statements\312AS\n\025google.p"
-          + "rotobuf.Empty\022:google.spanner.admin.data"
-          + "base.v1.UpdateDatabaseDdlMetadata\022\243\001\n\014Dr"
-          + "opDatabase\0225.google.spanner.admin.databa"
-          + "se.v1.DropDatabaseRequest\032\026.google.proto"
-          + "buf.Empty\"D\202\323\344\223\0023*1/v1/{database=project"
-          + "s/*/instances/*/databases/*}\332A\010database\022"
-          + "\315\001\n\016GetDatabaseDdl\0227.google.spanner.admi"
-          + "n.database.v1.GetDatabaseDdlRequest\0328.go"
-          + "ogle.spanner.admin.database.v1.GetDataba"
-          + "seDdlResponse\"H\202\323\344\223\0027\0225/v1/{database=pro"
-          + "jects/*/instances/*/databases/*}/ddl\332A\010d"
-          + "atabase\022\353\001\n\014SetIamPolicy\022\".google.iam.v1"
-          + ".SetIamPolicyRequest\032\025.google.iam.v1.Pol"
-          + "icy\"\237\001\202\323\344\223\002\206\001\">/v1/{resource=projects/*/"
-          + "instances/*/databases/*}:setIamPolicy:\001*"
-          + "ZA\"</v1/{resource=projects/*/instances/*"
-          + "/backups/*}:setIamPolicy:\001*\332A\017resource,p"
-          + "olicy\022\344\001\n\014GetIamPolicy\022\".google.iam.v1.G"
-          + "etIamPolicyRequest\032\025.google.iam.v1.Polic"
-          + "y\"\230\001\202\323\344\223\002\206\001\">/v1/{resource=projects/*/in"
-          + "stances/*/databases/*}:getIamPolicy:\001*ZA"
-          + "\"</v1/{resource=projects/*/instances/*/b"
-          + "ackups/*}:getIamPolicy:\001*\332A\010resource\022\234\002\n"
-          + "\022TestIamPermissions\022(.google.iam.v1.Test"
-          + "IamPermissionsRequest\032).google.iam.v1.Te"
-          + "stIamPermissionsResponse\"\260\001\202\323\344\223\002\222\001\"D/v1/"
-          + "{resource=projects/*/instances/*/databas"
-          + "es/*}:testIamPermissions:\001*ZG\"B/v1/{reso"
-          + "urce=projects/*/instances/*/backups/*}:t"
-          + "estIamPermissions:\001*\332A\024resource,permissi"
-          + "ons\022\237\002\n\014CreateBackup\0225.google.spanner.ad"
-          + "min.database.v1.CreateBackupRequest\032\035.go"
-          + "ogle.longrunning.Operation\"\270\001\202\323\344\223\0025\"+/v1"
-          + "/{parent=projects/*/instances/*}/backups"
-          + ":\006backup\332A\027parent,backup,backup_id\312A`\n\'g"
-          + "oogle.spanner.admin.database.v1.Backup\0225"
-          + "google.spanner.admin.database.v1.CreateB"
-          + "ackupMetadata\022\245\001\n\tGetBackup\0222.google.spa"
-          + "nner.admin.database.v1.GetBackupRequest\032"
-          + "(.google.spanner.admin.database.v1.Backu"
-          + "p\":\202\323\344\223\002-\022+/v1/{name=projects/*/instance"
-          + "s/*/backups/*}\332A\004name\022\310\001\n\014UpdateBackup\0225"
-          + ".google.spanner.admin.database.v1.Update"
-          + "BackupRequest\032(.google.spanner.admin.dat"
-          + "abase.v1.Backup\"W\202\323\344\223\002<22/v1/{backup.nam"
-          + "e=projects/*/instances/*/backups/*}:\006bac"
-          + "kup\332A\022backup,update_mask\022\231\001\n\014DeleteBacku"
-          + "p\0225.google.spanner.admin.database.v1.Del"
-          + "eteBackupRequest\032\026.google.protobuf.Empty"
-          + "\":\202\323\344\223\002-*+/v1/{name=projects/*/instances"
-          + "/*/backups/*}\332A\004name\022\270\001\n\013ListBackups\0224.g"
-          + "oogle.spanner.admin.database.v1.ListBack"
-          + "upsRequest\0325.google.spanner.admin.databa"
-          + "se.v1.ListBackupsResponse\"<\202\323\344\223\002-\022+/v1/{"
-          + "parent=projects/*/instances/*}/backups\332A"
-          + "\006parent\022\261\002\n\017RestoreDatabase\0228.google.spa"
-          + "nner.admin.database.v1.RestoreDatabaseRe"
-          + "quest\032\035.google.longrunning.Operation\"\304\001\202"
-          + "\323\344\223\002:\"5/v1/{parent=projects/*/instances/"
-          + "*}/databases:restore:\001*\332A\031parent,databas"
-          + "e_id,backup\312Ae\n)google.spanner.admin.dat"
-          + "abase.v1.Database\0228google.spanner.admin."
-          + "database.v1.RestoreDatabaseMetadata\022\344\001\n\026"
-          + "ListDatabaseOperations\022?.google.spanner."
-          + "admin.database.v1.ListDatabaseOperations"
-          + "Request\032@.google.spanner.admin.database."
-          + "v1.ListDatabaseOperationsResponse\"G\202\323\344\223\002"
-          + "8\0226/v1/{parent=projects/*/instances/*}/d"
-          + "atabaseOperations\332A\006parent\022\334\001\n\024ListBacku"
-          + "pOperations\022=.google.spanner.admin.datab"
-          + "ase.v1.ListBackupOperationsRequest\032>.goo"
+          + "p\022\026\n\tthrottled\030\004 \001(\010B\003\340A\003\"P\n\023DropDatabas"
+          + "eRequest\0229\n\010database\030\001 \001(\tB\'\340A\002\372A!\n\037span"
+          + "ner.googleapis.com/Database\"R\n\025GetDataba"
+          + "seDdlRequest\0229\n\010database\030\001 \001(\tB\'\340A\002\372A!\n\037"
+          + "spanner.googleapis.com/Database\",\n\026GetDa"
+          + "tabaseDdlResponse\022\022\n\nstatements\030\001 \003(\t\"\217\001"
+          + "\n\035ListDatabaseOperationsRequest\0227\n\006paren"
+          + "t\030\001 \001(\tB\'\340A\002\372A!\n\037spanner.googleapis.com/"
+          + "Instance\022\016\n\006filter\030\002 \001(\t\022\021\n\tpage_size\030\003 "
+          + "\001(\005\022\022\n\npage_token\030\004 \001(\t\"l\n\036ListDatabaseO"
+          + "perationsResponse\0221\n\noperations\030\001 \003(\0132\035."
+          + "google.longrunning.Operation\022\027\n\017next_pag"
+          + "e_token\030\002 \001(\t\"\253\001\n\026RestoreDatabaseRequest"
+          + "\0227\n\006parent\030\001 \001(\tB\'\340A\002\372A!\n\037spanner.google"
+          + "apis.com/Instance\022\030\n\013database_id\030\002 \001(\tB\003"
+          + "\340A\002\0224\n\006backup\030\003 \001(\tB\"\372A\037\n\035spanner.google"
+          + "apis.com/BackupH\000B\010\n\006source\"\347\002\n\027RestoreD"
+          + "atabaseMetadata\022\014\n\004name\030\001 \001(\t\022H\n\013source_"
+          + "type\030\002 \001(\01623.google.spanner.admin.databa"
+          + "se.v1.RestoreSourceType\022C\n\013backup_info\030\003"
+          + " \001(\0132,.google.spanner.admin.database.v1."
+          + "BackupInfoH\000\022E\n\010progress\030\004 \001(\01323.google."
+          + "spanner.admin.database.v1.OperationProgr"
+          + "ess\022/\n\013cancel_time\030\005 \001(\0132\032.google.protob"
+          + "uf.Timestamp\022(\n optimize_database_operat"
+          + "ion_name\030\006 \001(\tB\r\n\013source_info\"w\n Optimiz"
+          + "eRestoredDatabaseMetadata\022\014\n\004name\030\001 \001(\t\022"
+          + "E\n\010progress\030\002 \001(\01323.google.spanner.admin"
+          + ".database.v1.OperationProgress*5\n\021Restor"
+          + "eSourceType\022\024\n\020TYPE_UNSPECIFIED\020\000\022\n\n\006BAC"
+          + "KUP\020\0012\223\037\n\rDatabaseAdmin\022\300\001\n\rListDatabase"
+          + "s\0226.google.spanner.admin.database.v1.Lis"
+          + "tDatabasesRequest\0327.google.spanner.admin"
+          + ".database.v1.ListDatabasesResponse\">\202\323\344\223"
+          + "\002/\022-/v1/{parent=projects/*/instances/*}/"
+          + "databases\332A\006parent\022\244\002\n\016CreateDatabase\0227."
+          + "google.spanner.admin.database.v1.CreateD"
+          + "atabaseRequest\032\035.google.longrunning.Oper"
+          + "ation\"\271\001\202\323\344\223\0022\"-/v1/{parent=projects/*/i"
+          + "nstances/*}/databases:\001*\332A\027parent,create"
+          + "_statement\312Ad\n)google.spanner.admin.data"
+          + "base.v1.Database\0227google.spanner.admin.d"
+          + "atabase.v1.CreateDatabaseMetadata\022\255\001\n\013Ge"
+          + "tDatabase\0224.google.spanner.admin.databas"
+          + "e.v1.GetDatabaseRequest\032*.google.spanner"
+          + ".admin.database.v1.Database\"<\202\323\344\223\002/\022-/v1"
+          + "/{name=projects/*/instances/*/databases/"
+          + "*}\332A\004name\022\235\002\n\021UpdateDatabaseDdl\022:.google"
+          + ".spanner.admin.database.v1.UpdateDatabas"
+          + "eDdlRequest\032\035.google.longrunning.Operati"
+          + "on\"\254\001\202\323\344\223\002:25/v1/{database=projects/*/in"
+          + "stances/*/databases/*}/ddl:\001*\332A\023database"
+          + ",statements\312AS\n\025google.protobuf.Empty\022:g"
+          + "oogle.spanner.admin.database.v1.UpdateDa"
+          + "tabaseDdlMetadata\022\243\001\n\014DropDatabase\0225.goo"
+          + "gle.spanner.admin.database.v1.DropDataba"
+          + "seRequest\032\026.google.protobuf.Empty\"D\202\323\344\223\002"
+          + "3*1/v1/{database=projects/*/instances/*/"
+          + "databases/*}\332A\010database\022\315\001\n\016GetDatabaseD"
+          + "dl\0227.google.spanner.admin.database.v1.Ge"
+          + "tDatabaseDdlRequest\0328.google.spanner.adm"
+          + "in.database.v1.GetDatabaseDdlResponse\"H\202"
+          + "\323\344\223\0027\0225/v1/{database=projects/*/instance"
+          + "s/*/databases/*}/ddl\332A\010database\022\353\001\n\014SetI"
+          + "amPolicy\022\".google.iam.v1.SetIamPolicyReq"
+          + "uest\032\025.google.iam.v1.Policy\"\237\001\202\323\344\223\002\206\001\">/"
+          + "v1/{resource=projects/*/instances/*/data"
+          + "bases/*}:setIamPolicy:\001*ZA\"</v1/{resourc"
+          + "e=projects/*/instances/*/backups/*}:setI"
+          + "amPolicy:\001*\332A\017resource,policy\022\344\001\n\014GetIam"
+          + "Policy\022\".google.iam.v1.GetIamPolicyReque"
+          + "st\032\025.google.iam.v1.Policy\"\230\001\202\323\344\223\002\206\001\">/v1"
+          + "/{resource=projects/*/instances/*/databa"
+          + "ses/*}:getIamPolicy:\001*ZA\"</v1/{resource="
+          + "projects/*/instances/*/backups/*}:getIam"
+          + "Policy:\001*\332A\010resource\022\234\002\n\022TestIamPermissi"
+          + "ons\022(.google.iam.v1.TestIamPermissionsRe"
+          + "quest\032).google.iam.v1.TestIamPermissions"
+          + "Response\"\260\001\202\323\344\223\002\222\001\"D/v1/{resource=projec"
+          + "ts/*/instances/*/databases/*}:testIamPer"
+          + "missions:\001*ZG\"B/v1/{resource=projects/*/"
+          + "instances/*/backups/*}:testIamPermission"
+          + "s:\001*\332A\024resource,permissions\022\237\002\n\014CreateBa"
+          + "ckup\0225.google.spanner.admin.database.v1."
+          + "CreateBackupRequest\032\035.google.longrunning"
+          + ".Operation\"\270\001\202\323\344\223\0025\"+/v1/{parent=project"
+          + "s/*/instances/*}/backups:\006backup\332A\027paren"
+          + "t,backup,backup_id\312A`\n\'google.spanner.ad"
+          + "min.database.v1.Backup\0225google.spanner.a"
+          + "dmin.database.v1.CreateBackupMetadata\022\245\001"
+          + "\n\tGetBackup\0222.google.spanner.admin.datab"
+          + "ase.v1.GetBackupRequest\032(.google.spanner"
+          + ".admin.database.v1.Backup\":\202\323\344\223\002-\022+/v1/{"
+          + "name=projects/*/instances/*/backups/*}\332A"
+          + "\004name\022\310\001\n\014UpdateBackup\0225.google.spanner."
+          + "admin.database.v1.UpdateBackupRequest\032(."
+          + "google.spanner.admin.database.v1.Backup\""
+          + "W\202\323\344\223\002<22/v1/{backup.name=projects/*/ins"
+          + "tances/*/backups/*}:\006backup\332A\022backup,upd"
+          + "ate_mask\022\231\001\n\014DeleteBackup\0225.google.spann"
+          + "er.admin.database.v1.DeleteBackupRequest"
+          + "\032\026.google.protobuf.Empty\":\202\323\344\223\002-*+/v1/{n"
+          + "ame=projects/*/instances/*/backups/*}\332A\004"
+          + "name\022\270\001\n\013ListBackups\0224.google.spanner.ad"
+          + "min.database.v1.ListBackupsRequest\0325.goo"
           + "gle.spanner.admin.database.v1.ListBackup"
-          + "OperationsResponse\"E\202\323\344\223\0026\0224/v1/{parent="
-          + "projects/*/instances/*}/backupOperations"
-          + "\332A\006parent\032x\312A\026spanner.googleapis.com\322A\\h"
-          + "ttps://www.googleapis.com/auth/cloud-pla"
-          + "tform,https://www.googleapis.com/auth/sp"
-          + "anner.adminB\332\002\n$com.google.spanner.admin"
-          + ".database.v1B\031SpannerDatabaseAdminProtoP"
-          + "\001ZHgoogle.golang.org/genproto/googleapis"
-          + "/spanner/admin/database/v1;database\252\002&Go"
-          + "ogle.Cloud.Spanner.Admin.Database.V1\312\002&G"
-          + "oogle\\Cloud\\Spanner\\Admin\\Database\\V1\352\002+"
-          + "Google::Cloud::Spanner::Admin::Database:"
-          + ":V1\352AJ\n\037spanner.googleapis.com/Instance\022"
-          + "\'projects/{project}/instances/{instance}"
-          + "b\006proto3"
+          + "sResponse\"<\202\323\344\223\002-\022+/v1/{parent=projects/"
+          + "*/instances/*}/backups\332A\006parent\022\261\002\n\017Rest"
+          + "oreDatabase\0228.google.spanner.admin.datab"
+          + "ase.v1.RestoreDatabaseRequest\032\035.google.l"
+          + "ongrunning.Operation\"\304\001\202\323\344\223\002:\"5/v1/{pare"
+          + "nt=projects/*/instances/*}/databases:res"
+          + "tore:\001*\332A\031parent,database_id,backup\312Ae\n)"
+          + "google.spanner.admin.database.v1.Databas"
+          + "e\0228google.spanner.admin.database.v1.Rest"
+          + "oreDatabaseMetadata\022\344\001\n\026ListDatabaseOper"
+          + "ations\022?.google.spanner.admin.database.v"
+          + "1.ListDatabaseOperationsRequest\032@.google"
+          + ".spanner.admin.database.v1.ListDatabaseO"
+          + "perationsResponse\"G\202\323\344\223\0028\0226/v1/{parent=p"
+          + "rojects/*/instances/*}/databaseOperation"
+          + "s\332A\006parent\022\334\001\n\024ListBackupOperations\022=.go"
+          + "ogle.spanner.admin.database.v1.ListBacku"
+          + "pOperationsRequest\032>.google.spanner.admi"
+          + "n.database.v1.ListBackupOperationsRespon"
+          + "se\"E\202\323\344\223\0026\0224/v1/{parent=projects/*/insta"
+          + "nces/*}/backupOperations\332A\006parent\032x\312A\026sp"
+          + "anner.googleapis.com\322A\\https://www.googl"
+          + "eapis.com/auth/cloud-platform,https://ww"
+          + "w.googleapis.com/auth/spanner.adminB\332\002\n$"
+          + "com.google.spanner.admin.database.v1B\031Sp"
+          + "annerDatabaseAdminProtoP\001ZHgoogle.golang"
+          + ".org/genproto/googleapis/spanner/admin/d"
+          + "atabase/v1;database\252\002&Google.Cloud.Spann"
+          + "er.Admin.Database.V1\312\002&Google\\Cloud\\Span"
+          + "ner\\Admin\\Database\\V1\352\002+Google::Cloud::S"
+          + "panner::Admin::Database::V1\352AJ\n\037spanner."
+          + "googleapis.com/Instance\022\'projects/{proje"
+          + "ct}/instances/{instance}b\006proto3"
     };
     descriptor =
         com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
@@ -377,7 +377,7 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_spanner_admin_database_v1_UpdateDatabaseDdlMetadata_descriptor,
             new java.lang.String[] {
-              "Database", "Statements", "CommitTimestamps",
+              "Database", "Statements", "CommitTimestamps", "Throttled",
             });
     internal_static_google_spanner_admin_database_v1_DropDatabaseRequest_descriptor =
         getDescriptor().getMessageTypes().get(9);
diff --git a/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadata.java b/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadata.java
index 698e69f57b..84c28ef2cc 100644
--- a/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadata.java
+++ b/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadata.java
@@ -101,6 +101,11 @@ private UpdateDatabaseDdlMetadata(
                   input.readMessage(com.google.protobuf.Timestamp.parser(), extensionRegistry));
               break;
             }
+          case 32:
+            {
+              throttled_ = input.readBool();
+              break;
+            }
           default:
             {
               if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
@@ -334,6 +339,26 @@ public com.google.protobuf.TimestampOrBuilder getCommitTimestampsOrBuilder(int i
     return commitTimestamps_.get(index);
   }
 
+  public static final int THROTTLED_FIELD_NUMBER = 4;
+  private boolean throttled_;
+  /**
+   *
+   *
+   * <pre>
+   * Output only. When true, indicates that the operation is throttled e.g
+   * due to resource constraints. When resources become available the operation
+   * will resume and this field will be false again.
+   * </pre>
+   *
+   * <code>bool throttled = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+   *
+   * @return The throttled.
+   */
+  @java.lang.Override
+  public boolean getThrottled() {
+    return throttled_;
+  }
+
   private byte memoizedIsInitialized = -1;
 
   @java.lang.Override
@@ -357,6 +382,9 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < commitTimestamps_.size(); i++) {
       output.writeMessage(3, commitTimestamps_.get(i));
     }
+    if (throttled_ != false) {
+      output.writeBool(4, throttled_);
+    }
     unknownFields.writeTo(output);
   }
 
@@ -380,6 +408,9 @@ public int getSerializedSize() {
     for (int i = 0; i < commitTimestamps_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, commitTimestamps_.get(i));
     }
+    if (throttled_ != false) {
+      size += com.google.protobuf.CodedOutputStream.computeBoolSize(4, throttled_);
+    }
     size += unknownFields.getSerializedSize();
     memoizedSize = size;
     return size;
@@ -399,6 +430,7 @@ public boolean equals(final java.lang.Object obj) {
     if (!getDatabase().equals(other.getDatabase())) return false;
     if (!getStatementsList().equals(other.getStatementsList())) return false;
     if (!getCommitTimestampsList().equals(other.getCommitTimestampsList())) return false;
+    if (getThrottled() != other.getThrottled()) return false;
     if (!unknownFields.equals(other.unknownFields)) return false;
     return true;
   }
@@ -420,6 +452,8 @@ public int hashCode() {
       hash = (37 * hash) + COMMIT_TIMESTAMPS_FIELD_NUMBER;
       hash = (53 * hash) + getCommitTimestampsList().hashCode();
     }
+    hash = (37 * hash) + THROTTLED_FIELD_NUMBER;
+    hash = (53 * hash) + com.google.protobuf.Internal.hashBoolean(getThrottled());
     hash = (29 * hash) + unknownFields.hashCode();
     memoizedHashCode = hash;
     return hash;
@@ -579,6 +613,8 @@ public Builder clear() {
       } else {
         commitTimestampsBuilder_.clear();
       }
+      throttled_ = false;
+
       return this;
     }
 
@@ -623,6 +659,7 @@ public com.google.spanner.admin.database.v1.UpdateDatabaseDdlMetadata buildParti
       } else {
         result.commitTimestamps_ = commitTimestampsBuilder_.build();
       }
+      result.throttled_ = throttled_;
       onBuilt();
       return result;
     }
@@ -715,6 +752,9 @@ public Builder mergeFrom(com.google.spanner.admin.database.v1.UpdateDatabaseDdlM
           }
         }
       }
+      if (other.getThrottled() != false) {
+        setThrottled(other.getThrottled());
+      }
       this.mergeUnknownFields(other.unknownFields);
       onChanged();
       return this;
@@ -1419,6 +1459,64 @@ public java.util.List<com.google.protobuf.Timestamp.Builder> getCommitTimestamps
       return commitTimestampsBuilder_;
     }
 
+    private boolean throttled_;
+    /**
+     *
+     *
+     * <pre>
+     * Output only. When true, indicates that the operation is throttled e.g
+     * due to resource constraints. When resources become available the operation
+     * will resume and this field will be false again.
+     * </pre>
+     *
+     * <code>bool throttled = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+     *
+     * @return The throttled.
+     */
+    @java.lang.Override
+    public boolean getThrottled() {
+      return throttled_;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Output only. When true, indicates that the operation is throttled e.g
+     * due to resource constraints. When resources become available the operation
+     * will resume and this field will be false again.
+     * </pre>
+     *
+     * <code>bool throttled = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+     *
+     * @param value The throttled to set.
+     * @return This builder for chaining.
+     */
+    public Builder setThrottled(boolean value) {
+
+      throttled_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Output only. When true, indicates that the operation is throttled e.g
+     * due to resource constraints. When resources become available the operation
+     * will resume and this field will be false again.
+     * </pre>
+     *
+     * <code>bool throttled = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearThrottled() {
+
+      throttled_ = false;
+      onChanged();
+      return this;
+    }
+
     @java.lang.Override
     public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
       return super.setUnknownFields(unknownFields);
diff --git a/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadataOrBuilder.java b/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadataOrBuilder.java
index 013d06c253..ae6d6da4dc 100644
--- a/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadataOrBuilder.java
+++ b/proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlMetadataOrBuilder.java
@@ -164,4 +164,19 @@ public interface UpdateDatabaseDdlMetadataOrBuilder
    * <code>repeated .google.protobuf.Timestamp commit_timestamps = 3;</code>
    */
   com.google.protobuf.TimestampOrBuilder getCommitTimestampsOrBuilder(int index);
+
+  /**
+   *
+   *
+   * <pre>
+   * Output only. When true, indicates that the operation is throttled e.g
+   * due to resource constraints. When resources become available the operation
+   * will resume and this field will be false again.
+   * </pre>
+   *
+   * <code>bool throttled = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
+   *
+   * @return The throttled.
+   */
+  boolean getThrottled();
 }
diff --git a/proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/spanner_database_admin.proto b/proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/spanner_database_admin.proto
index af440c1a36..db6192bc02 100644
--- a/proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/spanner_database_admin.proto
+++ b/proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/spanner_database_admin.proto
@@ -514,6 +514,11 @@ message UpdateDatabaseDdlMetadata {
   // succeeded so far, where `commit_timestamps[i]` is the commit
   // timestamp for the statement `statements[i]`.
   repeated google.protobuf.Timestamp commit_timestamps = 3;
+
+  // Output only. When true, indicates that the operation is throttled e.g
+  // due to resource constraints. When resources become available the operation
+  // will resume and this field will be false again.
+  bool throttled = 4 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // The request for [DropDatabase][google.spanner.admin.database.v1.DatabaseAdmin.DropDatabase].
diff --git a/synth.metadata b/synth.metadata
index e7b4aedfc8..bb6f66dfac 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,15 +4,15 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-spanner.git",
-        "sha": "907ae1ff2f5c0b60510c435f5ba270bd92827104"
+        "sha": "f6a8ba6baff53ededf890e3f22a8e49402c98775"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "8f2eda119e11c8bd0c189b545da18bba9019c83e",
-        "internalRef": "322293383"
+        "sha": "8cfc6c874574b649b4524a4ef6a0651533325a84",
+        "internalRef": "345067549"
       }
     },
     {