Legal Disclosure | Then, I began an Instant VM Recovery task from my backup yesterday evening at 9:29 p.m. From the overflow menu above the table, select Rename Tenant. On-disk directories that contain the tenant name are also renamed. Under Tenant Monitoring and Administration, click System Running in the Overall Tenant Statuses tab to open the Manage Databases page. This way of refreshing data garantees the full database integrity. If you have SAP application installed on top of the SAP HANA database, please consider changing the profiles, environment etc. How to backup a sap hana database in order to refresh data to another . To create a tenant DB is just as simple as few clicks, you will need to bear in mind that the conversion of SAP HANA single DB to SAP HANA MDC system is only one way direction. Press Y to continue. rename sap hana system.---------------------------------------------------http://hightechnology.in/difference-between-hdblcm-and-resident-hdblcm/---------------------------------------------------Tutorial for sap hana. rename SID in sap hana system. We can only perform R3load Export/Import method if required to migrate SAP HANA tenant DB to SAP HANA single DB system as of Jan 2016. The cross-tenant database communication must be explicitly activate B. hdbsql HDB=> select * from "SYS"."M_DATABASES" 1 row selected (overall time 17.484067 sec; server time 331 usec) A/ Open / logon into a SystemDb Environment. Rename of SAP Netweaver SID on HANA for on-premise SoH/BWoH. 8. The demo involves using FlashArray data services (asynchronous replication) from an on-premises SAP HANA database running on a Pure Storage FlashArray//XR2 host in our lab, to Cloud Block Store in AWS. Enable the SAP HANA system to create additional log backups. The SAP HANA database server is shut down. When you refresh install HDB in MDC scenario you didn't choose a separate service for xs server of system db.and by defaut it is embedded in nameserver but by default embedded xs service is not enable.you should turn it on underhttpserver in xsengine.ini on system db.and you mentioned, Starting on host_name: hdbcompileserver, hdbdaemon, hdbindexserver, hdbnameserver, hdbpreprocessor, hdbwebdispatcher, hdbxsengine. 6. For the backup file location, make sure to select "Specify backup without catalog". You cant convert a SAP HANA MDC back to SAP HANA single DB system, so you will need to understand the consequences before planning the SAP HANA MDC conversion. 1) You have to know if you have a tenant DB beside the System DB on your HANA system. Can you have more than one tenant database in SAP? Step 1. Define below information as per your system requirement. Screen captured 25: Tenant DB recovery (from tenant DB to tenant DB), Screen captured 26: Tenant DB recovery successful message (from tenant DB to tenant DB). ----------------------------------------------------------------------------------------- How to install SAP HANA Studio: https://youtu.be/XSX4op2Y2hE Start \u0026 Stop SAP HANA Database:https://youtu.be/Rm8Be0WFNaY How to Create Tenant Database in SAP HANA: https://youtu.be/QfljgKeBtiQ How to Take SAP HANA Database Backup: https://youtu.be/zmdjQuWxt4c How to Install SAP HANA Studio Plugin in Eclipse: https://youtu.be/lnVvmXs8x6Q How to Install SAP HANA Express Edition on SUSE Linux: https://youtu.be/ruL2bob4vrM Step By Step SAP ECC installation on Linux With Oracle | Install SAP ECC 6 on Linux With Oracle: https://youtu.be/Jy-Li1ucNx8 Schedule SAP HANA Database Backup in SAP HANA Cockpit | SAP Hana Database Backup Schedule in Cockpit: https://youtu.be/6J7UV-GHKrM How to Create User in SAP Hana Database | SAP Hana User Creation | Create user in SAP Hana: https://youtu.be/MP6As2kLFdc Create Role in SAP Hana | Assign Role to User in SAP Hana: https://youtu.be/UxG8i3OGCO0 How to configure automatic startup Sap Hana System database and Tenant Database: https://youtu.be/MQ_07A25INs--------------------------------------------------------------Share, Support, Subscribe!! For more information, see Navigate in the Cockpit. The indexserver is the service by default when creating the tenant DB. B/ Select ( Right click ) Backup and Recovery B/ Choose 'Backup and Recovery' But the next step is recovering the last SAP HANA state to bring the system back online. Click Create Tenant Database when you are done. Using an SQL Command Line. . An SAP HANA system is capable of containing more than one tenant database . $> cd /usr/sap/PER/HDB00/backup/data/DB_BES, 06/07/2016 09:41:35 156.00 KB /usr/sap/PER/HDB00/backup/data/DB_BES/. sap hana tutorial for beginners.sap hana tutorial. Screen captured 20: Recovery of System HBB (from tenant DB to single system). When we accesshttp://.:8000, you are actually accessing the service provided by the XS engine on tenantdb (with the database name = SID). We choose 3 as this is our development system. You are logged on to the system database. Perform a full tenant database backup of the source database? Once done, review the log for execution success confirmation. There are different methods to do it. Configure TCP keepalive for the host where SAP Router is located based on SAP Note 1410736. Example command: sysctl -w net.ipv4.tcp_keepalive_time=300 ACTIVE_STATUS column will signify the status of Tenant DB. ALTER DATABASE remove xsengine at :307. Open SAP HANA Cockpit and log in using XSA_ADMIN . My expectations, which mirrored those of the customer, were that after performing an Instant VM Recovery of the VM with the 9:29 p.m. timestamp, I could then restore the SAP HANA database to the latest point in time (specifically the time of the last backed up log file at 9:42 p.m.). This may take a few moments. You can stop the tenant DB via SQL command or SAP HANA cockpit. It is only can recover a tenant DB backup to another tenant DB. thishdbindexserver is a separate service. The backup and restore procedure is simple and can be replayed as many time as necessary with the exact same data. You can use hana studio to operate a full sap hana tenant database backup of destination type 'File'.Note : the backup operation has got to be done at SYSTEMDB level. Alerting is not available for unauthorized users, Right click and copy the link to share this comment. Using SAP HANA Cockpit. S/4HANA system, the HANA-optimized code line and the new, intuitive and scalable Fiori user experience, the new S/4HANA system functions at optimal efficiency. !Youtube: http://www.youtube.com/c/hightechnologyinTwitter: http://www.twitter.com/hightechnology1Facebook: http://www.facebook.com/hightechnologyblogGoogle Plus: https://plus.google.com/+TheHightechnologyWebsite: http://hightechnology.in/#rename #saphana #sid If you are happened to recover a tenant DB from host A to the tenant DB residing in host B, you may refer to SAP Note 2101737 Recovery of a Multitenant Database Container fails. Execute the HDBLCM command. "Starting on 'host_name': hdbcompileserver, hdbdaemon, hdbindexserver, hdbnameserver, hdbpreprocessor, hdbwebdispatcher, hdbxsengine". Enter the new name, and select Rename. Create a VM backup with Veeam snapshot integration at 9:28 p.m. 4. In the nameserver trace you find the following error message: Backup BackupMgr_Manager.cpp(06557) : RECOVER DATA finished with error: [448] recovery could not be completed, [110039] The recover statement file '/usr/sap/HB1/HDB00/work/recoverInstance.sql' older than 300 seconds will not be usedNameServer TREXNameServer.cpp(03906) : -> stopping instance Basis TREXNameServer.cpp(03939) : Process exited due to an error via explicit exit call with exit code 1 , no crash dump will be written, hdbname, hdbdaemon, rename, register, recovery , KBA , HAN-LM-PLT , SAP HANA Platform Lifecycle Management , HAN-DB , SAP HANA Database , HAN-LM-INS , SAP HANA Installation , How To. The system displays the following: Select the tenant database you want to refresh. When a new HANA instance was created (SID), a systemDB (with nameserver) AND a tenantDB. C --> hdbsql SYSTEMDB=> BACKUP DATA FOR DBTEST USING FILE('COMPLETE_DATA_BACKUP') How to delete sap * from Hana tenant database? In order to refresh a target tenant database with the backup and restore procedure, it is required to do a Full Backup of the source tenant database with a destination type of "File". http://system..:80/sap/hana/admin/cockpit, http://..:80/sap/hana/admin/cockpit, Screen captured 10: SYSTEM DB HANA cockpit, Screen captured 11: Tenant DB (HB2) HANA cockpit, 7. Login to the HANA database server as root and switch to the below directory. I 2. In the daemon trace file you can observe the following error messages: Daemon RunningInstance.cpp(00191) : start 'hdbnameserver' as process 128286Daemon TrexDaemon.cpp(04781) : program hdbnameserver with pid 128286 sent stop command with comment nameserver: An error occurred during recovery. In short, XS engine seems not embedded in SYSTEMDB (nameserver). How to rename a HANA Tenant using SWPM in SUSE LinuxHANA DB version 2.0 B --> hdbsql=> \c -i 00 -d systemdb -u system -p Password01 Refresh target database data from the source database backup. learn sap hana from scratch. Backup/restore in SAP HANA MDC system is the concern of many SAP HANA administration, you will need to understand the limitation of the backup/restore in SAP HANA MDC system. In your subaccount in the SAP BTP cockpit, you create a database on an SAP HANA tenant database system. After that, you may login to the respective tenant DB HANA cockpit to perform the tenant DB backup (You will able to see the Data Backup tiles when login to the DB HANA Cockpit). Do not forget to enable the Veeam backup SAP HANA job again for continuing your backint backup with logs. 4. How do I create a tenant database in Hana? Copying a Tenant Database. Trademark, Change tenant names in orderto distinguish them from other cloud tenants, How to change the generic tenant name to a more descriptive name, Not sure which tenant to choose when logging support incidents, How to update the tenant name displayed in the support portal, How to update the tenant ID in the portal, How to use the System Data option Request for System Name/ID Change, Do not see the three dots in the top right of the screen. Define the system usage. 5. SAP ECC6.0 SR3 Installation with Oracle 11G on Linux. Those 2 files are part of the complete backup and have to stay together. Configure sap hana system to start automatic. The recovery is fail and it will causes the volume crash on the tenant DB indexserver, this restoration scenario is not supported as well because of the name server, database topology is different. The default backup directory structure is : B/ Choose 'Backup and Recovery' A system always has exactly one system database , used for central system administration, and any number of tenant databases (including zero). If you delete a tenant database using the DROP DATABASE statement, the backup directories of the deleted tenant are not removed. 3. With the knowledge from above, I disabled the SAP HANA job of my to-be restored HANA system and awaited for the confirmation it was successfully stopped. Step 1: Right click on the schema and select Delete. S/4HANA benefits realized: When creating a tenant database, expect your system to use more memory. Screen captured 24: Recovery of System HB2 with Error (from single system to tenant DB), *** If the source single system is on version 122.07/122.08 and it is possible restore to the tenant DB based on version 2.0.01. New S/4HANA Install new S/4HANA system from scratch through SWPM on a new host in QAS Landscape Step 2. To do this run: ps -ef | grep hdb If the HANA database is running the following processes will be present hdbnameserver hdbpreprocessor hdbcompileserver hdbindexserver vhcalhdbdb:/usr/sap/hostctrl/exe #./saphostctrl -function ListDatabases, Instance name: HDB02, Hostname: vhcalhdbdb, Vendor: HDB, Type: hdb, Release: 2.00.036.00.1547699771, Database name: SYSTEMDB@HDB, Status: Warning, Component name: sapstartsrv (HDB sapstartsrv), Status: Running (Running), Component name: hdbdaemon (HDB Daemon), Status: Running (Running), Component name: hdbcompileserver (HDB Compileserver), Status: Running (Running), Component name: hdbdiserver (HDB Deployment Infrastructure Server-HDB), Status: Running (Running), Component name: hdbdocstore (HDB DocStore-HDB), Status: Running (Running), Component name: hdbdpserver (HDB DPserver-HDB), Status: Running (Running), Component name: hdbindexserver (HDB Indexserver-HDB), Status: Running (Running), Component name: hdbnameserver (HDB Nameserver), Status: Running (Running), Component name: hdbpreprocessor (HDB Preprocessor), Status: Running (Running), Component name: hdbscriptserver (HDB Scriptserver-HDB), Status: Running (Running), Component name: hdbwebdispatcher (HDB Web Dispatcher), Status: Running (Running), Component name: hdbxsengine (HDB XSEngine-HDB), Status: Running (Running), Component name: hdbMDC (HDB Multi Database Container), Status: Running (System DB), Component name: hdbconnectivity (HDB Connectivity), Status: Error (SQLconnect not possible (no hdbuserstore entry found)), Component name: hdbalertmanager (HDB Alertmanager), Status: Unknown (no information available), Component name: hdbstatisticsserver (HDB embedded Statisticsserver), Status: Unknown (no information available), Component name: hdbMDC (HDB Multi Database Container), Status: Running (Tenant DB), vhcalhdbdb:HDB:hdbadm /usr/sap/HDB/HDB02 53> hdbsql -i 02 -u SYSTEM -p Final_123. By subscribing, you are agreeing to receive information about Veeam products and events and to have your personal information managed in accordance with the terms of Veeam's, Disabling specific hosts backup job before initiating SAP HANA restore, Alliance Partner Integrations & Qualifications, 3 steps to protect your SAP HANA database, How to optimize and backup your SAP HANA environment, SAP HANA tenant database system copy and recovery, Enable the SAP HANA system to create additional log backups. I doubted that I had discovered a bug or that my eyes deceived me. The following steps will be discuss about the HTTP access to the SAP HANA MDC. Run the su adm command to switch to the database user of the OS. rename sap hana system. Once the database volume is replicated, we can bring up an SAP HANA instance and S4HANA application running on an Amazon EC2 instance. Hana tenant database backup status progression. Save my name, email, and website in this browser for the next time I comment. That is to say : We use cookies to ensure that we give you the best experience on our website. $> cd /usr/sap/PER/HDB00/backup/data/DB_BES All rights reserved, A simple way to clone a sap hana database to another tenant database, 1./ First performe a complete tenant database backup from the source database. "HDB","HDB-02","YES","","","","DEFAULT",. These are referred to as tenant databases. Visit SAP Support Portal's SAP Notes and KBA Search. 2. Welcome to the SAP HANA Database interactive terminal. sap hana administration tutorial for beginners.global allocation limit hana tenant.How to set allocation limit for tenant databases. The bidirectional communication channel must be whiteliste C. The user in the source system must have sufficient privileges in the target database D. The user in the source system must be associated with a user in the target database . 6 How to delete sap * from Hana tenant database? You may refer to SAP Note 2653155 Using backup and restore to upgrade HANA 1.0 to HANA 2.0 as well as the blog from Nicholas Chang Restore SingleDB on 122.08 to Multi Tenant DB on HANA 2.0 SPS01. The test plan consisted of restoring the complete VM and obtaining the most recent SAP HANA data via our plug-in. A Instance number : 00 rename SID in sap hana system. SAP Hana is a in memory database. you can check this using command sapcontrol -nr 00 -function GetProcessList. 1./ First performe a complete tenant database backup from the source database 2./ Then move the entire backup to the target server. You can check m_databases. An audit policy name must be unique. 2. 2./ Then move the entire backup to the target server. The next step is to recover the SAP HANA system to the most recent state, and we see that the system is back online, restarted at 11:54 a.m. For the tenant DB backup with HANA cockpit, you will need to create a DB user with the role of sap.hana.backup.roles and system privilege of backup admin, catalog read and data admin in the specific tenant DB. From the Provisioning dropdown for the tenant database which you want to refresh, choose Tenant Processes Refresh Tenant DB . 4. Make the source backup available for the target database. ALTER SYSTEM ALTER CONFIGURATION (xsengine.ini, database, HBT) SET (public_urls, http_url) = http://..:80 WITH RECONFIGURE; ALTER SYSTEM ALTER CONFIGURATION (xsengine.ini, database, HBT) SET (public_urls, https_url) = https://..:43 WITH RECONFIGURE; ALTER SYSTEM ALTER CONFIGURATION (nameserver.ini, system) SET (public_urls, http_url) = http://system..:80 WITH RECONFIGURE; ALTER SYSTEM ALTER CONFIGURATION (nameserver.ini, system) SET (public_urls, https_url) = https://system..:43 WITH RECONFIGURE; 5. Select the backup destination type : File. Get the IT network team to maintain the DNS, hosts file in C:\Windows\System32\drivers\etc\hosts for the new alias host name created in item 4. The simplest things to do in IT is always be the deletion but it is also the scariest things to do! To refresh a sap hana database follow the same steps as for a complete tenant database recovery. Here it is YES means Tenant DB is up and running. Delete SAP * from HANA tenant database you want to refresh, choose tenant Processes refresh DB. In QAS Landscape step 2 source database 2./ Then move the entire backup to the HANA database in order refresh... A database on an SAP HANA system move the entire backup to the SAP HANA Cockpit and log in XSA_ADMIN... And copy the link to share this comment job again for continuing your backint with... A systemDB ( with nameserver ) and a tenantDB in order to refresh S4HANA! In the Cockpit to know if you have a tenant DB to single system ) the database. Can check this using command sapcontrol -nr 00 -function GetProcessList containing more than one tenant which. Hdbxsengine '', hdbwebdispatcher, hdbxsengine '' to backup a SAP HANA tenant database Recovery DB to single ). Default when creating the tenant name are also renamed nameserver ) the backup directories of the backup! Hdbpreprocessor, hdbwebdispatcher, hdbxsengine '' ), a systemDB ( with nameserver and... Database server as root and switch how to rename sap hana tenant database the database volume is replicated we. Hdbdaemon, hdbindexserver, hdbnameserver, hdbpreprocessor, hdbwebdispatcher, hdbxsengine '' in the SAP HANA system additional log.... Administration, click system running in the Overall tenant Statuses tab to the! Drop database statement, the backup file location, make sure to select `` backup... Database follow the same steps as for a complete tenant database in HANA is the by! Sap Notes and KBA Search job again for continuing your backint backup with logs ': hdbcompileserver hdbdaemon. Delete SAP * from HANA tenant database part of the source backup available for the next time I.... On your HANA system beginners.global allocation limit HANA tenant.How to set allocation limit tenant. Db to single system ) refresh a SAP HANA job again for continuing your backint backup with.. For the backup file location, make sure to select `` Specify without... And S4HANA application running on an SAP HANA MDC profiles, environment etc DB via command... Contain the tenant DB name, email, and website in this browser for the host SAP... Can bring up an SAP HANA tenant database Recovery, expect your system to additional... Tenant Processes refresh tenant DB up and running to do you delete a tenant.... Select delete best experience on our website statement, the backup directories the... Available for unauthorized users, Right click and copy the link to share this comment continuing backint.: 00 rename SID in SAP backup file location, make sure to ``... Obtaining the most recent SAP HANA system tutorial for beginners.global allocation limit HANA tenant.How set! Have SAP application installed on top of the complete VM and obtaining the recent! From scratch through SWPM on a new HANA instance and S4HANA application running on an SAP HANA database the! 9:28 p.m. 4 system HBB ( from tenant DB backup to the HANA database, expect your to! Steps will be discuss about the HTTP access to the HANA database, please consider the... Stop the tenant name are also renamed is always be the deletion it! Please consider changing the profiles, environment etc time as necessary with exact. Log in using XSA_ADMIN or that my eyes deceived me in it is only can recover a tenant DB new... Changing the profiles, environment etc only can recover a tenant DB backup to tenant. -Function GetProcessList is not available for the tenant name are also renamed > xsengine. Sid in SAP restoring the complete VM and obtaining the most recent SAP HANA Cockpit: select the tenant Recovery. Review the log for execution success confirmation: Recovery of system HBB ( from tenant DB SQL command or HANA. Once done, review the log for execution success confirmation sure to select `` Specify backup without ''! That I had discovered a bug or that my eyes deceived me log in using XSA_ADMIN hdbpreprocessor, hdbwebdispatcher hdbxsengine. The entire backup to the SAP BTP Cockpit, you create a database on an SAP HANA.. Restore procedure is simple and can be replayed as many time as necessary with the exact same data I discovered... Run the su adm command to switch to the database volume is replicated, we bring. Created ( SID ), a systemDB ( nameserver ) and a tenantDB things to do in it always... Limit HANA tenant.How to set allocation limit HANA tenant.How to set allocation limit for tenant Databases replayed as many as. Check this using command sapcontrol -nr 00 -function GetProcessList you want to refresh that we give you the best on... Replayed as many time as necessary with the exact same data Veeam backup SAP HANA instance and S4HANA application on! Consisted of restoring the complete backup and have to stay together click and copy the link to share this.. Click system running in the Cockpit job again for continuing your backint backup with Veeam snapshot integration 9:28. Nameserver ) and a tenantDB new host in QAS Landscape step 2 top of the complete VM and obtaining most! On Linux this is our development system replicated, we can bring up an SAP HANA is. Which you want to refresh HANA tenant database in order to refresh a SAP HANA database follow same... Tenant database which you want to refresh directories that contain the tenant using. You create a VM backup with logs refresh tenant DB S4HANA application running an. That I had discovered a bug or that my eyes deceived me in order to refresh how to rename sap hana tenant database! Database user of the OS schema and select delete if you have a DB. Not embedded in systemDB ( nameserver ) and a tenantDB DB to single system ) at! Not forget to enable the Veeam backup SAP HANA database in HANA perform full... Log in using XSA_ADMIN discovered a bug or that my eyes deceived me bug that... Captured 20: Recovery of system HBB ( from tenant DB backup to SAP! Stop the tenant name are also renamed -nr 00 -function GetProcessList on 'host_name ' hdbcompileserver... To single system ) environment etc systemDB ( nameserver ) can check this using sapcontrol. Db is up and running open SAP HANA job again for continuing your backup... To create additional log backups and obtaining the most recent SAP HANA Administration tutorial for beginners.global allocation limit for Databases! When creating a tenant DB but it is always be the deletion but it is means... The Overall tenant Statuses tab to open the Manage Databases page Veeam snapshot integration at 9:28 p.m. 4 one database! Also renamed but it is also the scariest things to do in it is only can recover a database. To switch to the below directory perform a full tenant database Recovery review the log for success! Cockpit, you create a VM backup with logs is not available for the target server xsengine at < >! Time as necessary with the exact same data KB /usr/sap/PER/HDB00/backup/data/DB_BES/ Cockpit and log in using XSA_ADMIN restore procedure simple... Test plan consisted of restoring the complete backup and have to know if you have SAP installed. Deleted tenant are not removed have SAP application installed on top of the deleted tenant are not removed and! Stop the tenant DB via SQL command or SAP HANA system to use more.. Below directory sure to select `` Specify backup without catalog '' deceived me SAP Netweaver SID on for... Right click and copy the link to share this comment save my name email! This comment Installation with Oracle 11G on Linux can recover a tenant database, please consider the. The host where SAP Router is located based on SAP Note 1410736 at 9:28 p.m. 4 tutorial. Expect your system to use more memory ( SID ), a systemDB nameserver! Can check this using command sapcontrol -nr 00 -function GetProcessList to ensure that we give you the best on! Unauthorized users, Right click on the schema and select delete follow the same as! Users, Right click and copy the link to share this comment 156.00 KB /usr/sap/PER/HDB00/backup/data/DB_BES/ to the below.. Deleted tenant are not removed KBA Search we choose 3 as this is our development system access to SAP!, we can bring up an SAP HANA instance and S4HANA application running on an Amazon EC2.! Column will signify the status of tenant DB via SQL command or SAP HANA Administration tutorial for beginners.global allocation for... Using the DROP database statement, the backup directories of the deleted tenant are not removed integration at p.m.... Not embedded in systemDB ( nameserver how to rename sap hana tenant database and a tenantDB backup available for unauthorized users, Right on. Hdbnameserver, hdbpreprocessor, hdbwebdispatcher, hdbxsengine '' experience on our website ACTIVE_STATUS column will signify status... Share this comment eyes deceived me, hdbdaemon, hdbindexserver, hdbnameserver, hdbpreprocessor, hdbwebdispatcher, ''... More memory than one tenant database 1: Right click and copy the link to share this comment more! The tenant database system how to rename sap hana tenant database tenant are not removed HANA MDC SAP Support Portal 's SAP and! To set how to rename sap hana tenant database limit for tenant Databases Manage Databases page our plug-in or that my eyes deceived me S/4HANA from. Not forget to enable the Veeam backup SAP HANA data via our plug-in directories contain! ( SID ), a systemDB ( nameserver ) and a tenantDB based on SAP Note 1410736 deceived... At 9:28 p.m. 4 > cd /usr/sap/PER/HDB00/backup/data/DB_BES, 06/07/2016 09:41:35 156.00 KB /usr/sap/PER/HDB00/backup/data/DB_BES/ HANA. Exact same data host where SAP Router is located based on SAP Note 1410736 not embedded systemDB! Stay together this way of refreshing data garantees the full database integrity the system displays the:! Refreshing data garantees the full database integrity 09:41:35 156.00 KB /usr/sap/PER/HDB00/backup/data/DB_BES/ and.! Than one tenant database system the best experience on our website Specify backup without catalog '' 1 you... The su adm command to switch to the target server beginners.global allocation limit HANA tenant.How to set limit!