{"id":85810,"date":"2021-02-27T09:00:22","date_gmt":"2021-02-27T03:30:22","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=85810"},"modified":"2021-02-24T11:59:00","modified_gmt":"2021-02-24T06:29:00","slug":"lock-objects-in-sap-abap-types-and-examples","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/lock-objects-in-sap-abap-types-and-examples\/","title":{"rendered":"Lock Objects in SAP ABAP &#8211; Types and Examples"},"content":{"rendered":"<p>In this tutorial, we\u2019ll be learning about Lock Objects in ABAP.<\/p>\n<p>We will learn about what they mean, what their function is, how to create them, and technical details about them.<\/p>\n<h3>What are Lock Objects in ABAP?<\/h3>\n<ul>\n<li>Lock Objects in ABAP are part of the Data Dictionary which are primarily used for synchronisation tasks.<\/li>\n<li>When more than one program tries to access the same data, it requires a lock over the data so that there is no inconsistency in the final saved data.<\/li>\n<li>Whenever someone tries to modify or update data, ABAP needs to make sure that data remains integrated across all users or programs.<\/li>\n<li>Hence, we need to define lock objects for tables &#8211; their data along with key fields.<\/li>\n<li>Lock objects are global, reusable and important for synchronisation to generate function modules across multiple programs and users.<\/li>\n<\/ul>\n<h3>Types of SAP ABAP Lock Objects<\/h3>\n<h4>1. Read\/Shared Lock in ABAP<\/h4>\n<ul>\n<li>This lock allows read-only access to the object shared<\/li>\n<li>It allows programs and users to read the data or object but not write\/modify\/update the same<\/li>\n<li>Thus it protects \u2018read\u2019 access to data or object<\/li>\n<\/ul>\n<h4>2. Write\/Exclusive Lock<\/h4>\n<ul>\n<li>This lock allows neither read nor write access to shared objects by other transactions or users<\/li>\n<li>Thus it protects \u2018write\u2019 access to data or object<\/li>\n<\/ul>\n<h4>3. Enhanced\/Exclusive without Cumulating Lock<\/h4>\n<ul>\n<li>This lock works similarly to write\/exclusive lock<\/li>\n<li>Enhanced lock includes additional features like protecting the object or data from further access attempted by same program, transaction or user<\/li>\n<\/ul>\n<h3>SAP ABAP Lock Mechanism<\/h3>\n<p><strong>The main purpose or goals of a lock mechanism in SAP ABAP are as follows &#8211;<\/strong><\/p>\n<ul>\n<li>A lock allows a user or program to convey to other users or programs that it is currently accessing some data or object and for them to prevent modifying it at the same time.<\/li>\n<li>It also avoids the program itself from reading or modifying the object that another program is currently accessing.<\/li>\n<\/ul>\n<p><strong>ABAP Lock mechanism is as follows &#8211;<\/strong><\/p>\n<ol>\n<li>First, the program generates a lock request.<\/li>\n<li>This lock request goes to the \u2018ENQUEUE\u2019 server .<\/li>\n<li>The server creates a lock in the table.<\/li>\n<li>Now, the \u2018ENQUEUE\u2019 server sets the lock, which gives the program \u2018read\u2019 or \u2018write\u2019 or \u2018exclusive\u2019 access, etc.<\/li>\n<li>This lock mechanism is automatically followed by a program with statements like \u2018INSERT\u2019, \u2018UPDATE\u2019, \u2018DELETE\u2019.<\/li>\n<li>However, the locks are useful only for the current statement. If you want a lock for multiple statements, you will have to create this multiple times.<\/li>\n<\/ol>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85832\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image.jpg\" alt=\"Lock Objects Mechanism in SAP ABAP\" width=\"800\" height=\"628\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image.jpg 800w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image-300x236.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image-150x118.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image-768x603.jpg 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image-720x565.jpg 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image-520x408.jpg 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image-320x251.jpg 320w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<h3>Structure of SAP ABAP Lock Object<\/h3>\n<ul>\n<li>A lock object defines the table or data along with its key fields.<\/li>\n<li>The primary table to be locked is considered with its key field.<\/li>\n<li>If you want to include multiple (secondary) tables, you can include them using foreign keys.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85833\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02.jpg\" alt=\"Structure of a Lock Object in ABAP\" width=\"900\" height=\"500\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02.jpg 900w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02-300x167.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02-150x83.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02-768x427.jpg 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02-720x400.jpg 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02-520x289.jpg 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image02-320x178.jpg 320w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><\/p>\n<h3>Function Modules used for Lock Objects<\/h3>\n<p><strong>1. ENQUEUE<\/strong><\/p>\n<p><strong>Syntax:<\/strong> ENQUEUE &lt;lock_object_name&gt;<\/p>\n<p>This function module sets the lock for the object. We use it to insert the object into a queue<\/p>\n<p><strong>2. DEQUEUE<\/strong><\/p>\n<p><strong>Syntax:<\/strong> DEQUEUE &lt;lock_object_name&gt;<\/p>\n<p>This function module releases the lock for the object. We use it to remove the object from a queue<\/p>\n<h3>Example of Lock Objects in ABAP<\/h3>\n<p>Let\u2019s take the example of booking tickets for a movie screening.<\/p>\n<p>A movie theatre, as we know, has limited capacity. Hence we must prevent overbooking when multiple patrons are attempting to book tickets online.<\/p>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85834\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03.jpg\" alt=\"Example of Lock Objects in SAP ABAP\" width=\"1200\" height=\"800\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03.jpg 1200w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-300x200.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-1024x683.jpg 1024w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-150x100.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-768x512.jpg 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-720x480.jpg 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-520x347.jpg 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-320x213.jpg 320w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Lock-Objects-in-SAP-ABAP-Normal-image03-272x182.jpg 272w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><\/p>\n<h3><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85856\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2.png\" alt=\"Example of Lock Objects\" width=\"1080\" height=\"1080\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2.png 1080w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-300x300.png 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-1024x1024.png 1024w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-150x150.png 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-768x768.png 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-80x80.png 80w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-320x320.png 320w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-720x720.png 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/Example-of-Lock-Objects-2-520x520.png 520w\" sizes=\"auto, (max-width: 1080px) 100vw, 1080px\" \/><\/a><\/h3>\n<h3>How to create Lock Objects in ABAP<\/h3>\n<p>Let\u2019s look at the steps to create lock objects in SAP ABAP &#8211;<\/p>\n<p>1. Open the SAP System.<\/p>\n<p>2. In transaction code input, enter \u2018SE11\u2019 to go to the Data Dictionary.<\/p>\n<p>3. Select \u2018Lock Object\u2019 from the radio button options.<\/p>\n<p>4. Now since we are creating a new one, enter a name for the object (beginning with \u2018E\u2019).<\/p>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85857\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1.png\" alt=\"How to create Lock Objects in ABAP\" width=\"664\" height=\"507\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1.png 664w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1-300x229.png 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1-150x115.png 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1-520x397.png 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-1-320x244.png 320w\" sizes=\"auto, (max-width: 664px) 100vw, 664px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">5. Select button \u2018Create\u2019.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">6. Enter a \u2018Short Description\u2019 for the lock object.<\/span><\/p>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85858\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2.png\" alt=\"How to create Lock Objects in ABAP\" width=\"848\" height=\"159\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2.png 848w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2-300x56.png 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2-150x28.png 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2-768x144.png 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2-720x135.png 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2-520x98.png 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-2-320x60.png 320w\" sizes=\"auto, (max-width: 848px) 100vw, 848px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">7. Select the tab called \u2018Tables\u2019.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">8. Now enter the name of the table on which the lock is to be performed.<\/span><\/p>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-85859\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3.png\" alt=\"How to create Lock Objects in ABAP\" width=\"1061\" height=\"570\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3.png 1061w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-300x161.png 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-1024x550.png 1024w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-150x81.png 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-768x413.png 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-720x387.png 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-520x279.png 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/02\/How-to-create-Lock-Objects-in-ABAP-3-320x172.png 320w\" sizes=\"auto, (max-width: 1061px) 100vw, 1061px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">9. Select what kind of lock you want to have.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">10. Save and activate this (Ctrl+S, then Ctrl+F2).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">11. Select Lock Modules and you will have created the lock object successfully.<\/span><\/p>\n<h3>Uses &amp; Advantages of ABAP Lock Objects<\/h3>\n<p>1. Lock objects in ABAP promote synchronisation of objects.<\/p>\n<p>2. They protect the integrity and uniformity of data across objects.<\/p>\n<p>3. They prevent collision of data, and display of the same data in different versions to different users or transactions.<\/p>\n<p>4. The Lock Objects notify other transactions that a shared object is currently being used by one particular transaction or user.<\/p>\n<h3>Summary<\/h3>\n<p>Thus, in this tutorial, we learnt about locks and lock objects in ABAP. We learnt its importance, how to create one, and how to use a lock object.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we\u2019ll be learning about Lock Objects in ABAP. We will learn about what they mean, what their function is, how to create them, and technical details about them. What are Lock&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":85831,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23786],"tags":[23814,23813,23815,23811,23812],"class_list":["post-85810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sap-abap","tag-advantages-of-sap-abap-lock-objects","tag-function-modules-in-abap","tag-lock-mechanism-in-abap","tag-lock-objects-in-sap-abap","tag-types-of-lock-objects-in-sap-abap"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lock Objects in SAP ABAP - Types and Examples - DataFlair<\/title>\n<meta name=\"description\" content=\"Learn What are Lock Objects in SAP ABAP with Types &amp; Examples, Lock Mechanism, Structure, Function Module, Uses &amp; Advantages of Lock Objects\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/lock-objects-in-sap-abap-types-and-examples\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lock Objects in SAP ABAP - Types and Examples - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Learn What are Lock Objects in SAP ABAP with Types &amp; 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