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<a href="/docs/2.9.1/quick-start/dotnet"
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>.NET/C#</a>
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<a href="/docs/2.9.1/quick-start/sql"
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<a href="/docs/2.9.1/quick-start/php"
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>PHP</a>
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>Installing Using Docker</a>
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<li>
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>Installing DEB or RPM package</a>
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>Setting Up</a>
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<li>
<a href="/docs/2.9.1/logging"
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<li>
<a href="/docs/2.9.1/resources-injection"
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<li>
<a href="/docs/2.9.1/starting-nodes" class='' >Starting and Stopping Nodes</a>
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<a href="/docs/2.9.1/clustering/clustering"
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>TCP/IP Discovery</a>
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<li>
<a href="/docs/2.9.1/clustering/zookeeper-discovery"
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>ZooKeeper Discovery</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/discovery-in-the-cloud"
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>Discovery in the Cloud</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/network-configuration"
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>Network Configuration</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/connect-client-nodes"
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>Connecting Client Nodes</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/baseline-topology"
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>Baseline Topology</a>
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<a href="/docs/2.9.1/thin-clients/java-thin-client"
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>Java Thin Client</a>
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<li>
<a href="/docs/2.9.1/thin-clients/dotnet-thin-client"
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>.NET Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/cpp-thin-client"
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>C++ Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/python-thin-client"
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>Python Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/php-thin-client"
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>PHP Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/nodejs-thin-client"
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>Node.js Thin Client</a>
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<button
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<li><a href="/docs/2.9.1/binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/data-format" class=''>Data Format</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li>
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<li>
<a href="/docs/2.9.1/data-modeling/data-modeling"
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<li>
<a href="/docs/2.9.1/data-modeling/data-partitioning"
class=''
>Data Partitioning</a>
</li>
<li>
<a href="/docs/2.9.1/data-modeling/affinity-collocation"
class=''
>Affinity Colocation</a>
</li>
<li>
<a href="/docs/2.9.1/data-modeling/binary-marshaller"
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>Binary Marshaller</a>
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</li>
<li>
<button type='button' class='group-toggle expanded '>Configuring Memory<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.9.1/memory-architecture"
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>Memory Architecture</a>
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<li>
<a href="/docs/2.9.1/memory-configuration/data-regions"
class=''
>Configuring Data Regions</a>
</li>
<li>
<a href="/docs/2.9.1/memory-configuration/eviction-policies"
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>Eviction Policies</a>
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<li>
<button type='button' class='group-toggle collapsed '>Configuring Persistence<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.1/persistence/native-persistence"
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>Ignite Persistence</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/external-storage"
class=''
>External Storage</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/swap"
class=''
>Swapping</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/custom-cache-store"
class=''
>Implementing Custom Cache Store</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/snapshots"
class=''
>Cluster Snapshots</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/disk-compression"
class=''
>Disk Compression</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/persistence-tuning"
class=''
>Tuning Persistence</a>
</li>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.1/configuring-caches/configuration-overview"
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>Cache Configuration</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/configuring-backups"
class=''
>Configuring Partition Backups</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/partition-loss-policy"
class=''
>Partition Loss Policy</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/atomicity-modes"
class=''
>Atomicity Modes</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/expiry-policies"
class=''
>Expiry Policy</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/on-heap-caching"
class=''
>On-Heap Caching</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/cache-groups"
class=''
>Cache Groups</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/near-cache"
class=''
>Near Caches</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/data-rebalancing" class='' >Data Rebalancing</a>
</li>
<li>
<a href="/docs/2.9.1/data-streaming" class='' >Data Streaming</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Using Key-Value API<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.1/key-value-api/basic-cache-operations"
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</li>
<li>
<a href="/docs/2.9.1/key-value-api/binary-objects"
class=''
>Working with Binary Objects</a>
</li>
<li>
<a href="/docs/2.9.1/key-value-api/using-scan-queries"
class=''
>Using Scan Queries</a>
</li>
<li>
<a href="/docs/2.9.1/read-repair"
class=''
>Read Repair</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/key-value-api/transactions" class='' >Performing Transactions</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Working with SQL<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.1/SQL/sql-introduction"
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>Introduction</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/schemas"
class=''
>Understanding Schemas</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/indexes"
class=''
>Defining Indexes</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/sql-api"
class=''
>Using SQL API</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/distributed-joins"
class=''
>Distributed Joins</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/sql-transactions"
class=''
>SQL Transactions</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/custom-sql-func"
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>Custom SQL Functions</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/JDBC/jdbc-driver"
class=''
>JDBC Driver</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/JDBC/jdbc-client-driver"
class=''
>JDBC Client Driver</a>
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<button
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<li><a href="/docs/2.9.1/SQL/ODBC/odbc-driver" class=''>ODBC Driver</a></li>
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<li><a href="/docs/2.9.1/SQL/ODBC/querying-modifying-data" class=''>Querying and Modifying Data</a></li>
<li><a href="/docs/2.9.1/SQL/ODBC/specification" class=''>Specification</a></li>
<li><a href="/docs/2.9.1/SQL/ODBC/data-types" class=''>Data Types</a></li>
<li><a href="/docs/2.9.1/SQL/ODBC/error-codes" class=''>Error Codes</a></li>
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<li>
<a href="/docs/2.9.1/transactions/mvcc"
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<button type='button' class='group-toggle collapsed '>SQL Reference<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.9.1/sql-reference/sql-conformance"
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<li>
<a href="/docs/2.9.1/sql-reference/ddl"
class=''
>Data Definition Language (DDL)</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/dml"
class=''
>Data Manipulation Language (DML)</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/transactions"
class=''
>Transactions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/operational-commands"
class=''
>Operational Commands</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/aggregate-functions"
class=''
>Aggregate functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/numeric-functions"
class=''
>Numeric Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/string-functions"
class=''
>String Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/date-time-functions"
class=''
>Data and Time Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/system-functions"
class=''
>System Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/data-types"
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>Data Types</a>
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</li>
<li>
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<li>
<a href="/docs/2.9.1/distributed-computing/distributed-computing"
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>Distributed Computing API</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/cluster-groups"
class=''
>Cluster Groups</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/executor-service"
class=''
>Executor Service</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/map-reduce"
class=''
>MapReduce API</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/load-balancing"
class=''
>Load Balancing</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/fault-tolerance"
class=''
>Fault Tolerance</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/job-scheduling"
class=''
>Job Scheduling</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/collocated-computations"
class=''
>Colocating Computations with Data</a>
</li>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Code Deployment<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.9.1/code-deployment/deploying-user-code"
class=''
>Deploying User Code</a>
</li>
<li>
<a href="/docs/2.9.1/code-deployment/peer-class-loading"
class=''
>Peer Class Loading</a>
</li>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Machine Learning<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.9.1/machine-learning/machine-learning"
class=''
>Machine Learning</a>
</li>
<li>
<a href="/docs/2.9.1/machine-learning/partition-based-dataset"
class=''
>Partition Based Dataset</a>
</li>
<li>
<a href="/docs/2.9.1/machine-learning/updating-trained-models"
class=''
>Updating Trained Models</a>
</li>
<li>
<button
type='button'
class='collapsed '>Binary Classification<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
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</li>
<li>
<button
type='button'
class='collapsed '>Regression<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/2.9.1/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
<li><a href="/docs/2.9.1/machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li>
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</li>
<li>
<button
type='button'
class='collapsed '>Clustering<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/2.9.1/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/machine-learning/preprocessing"
class=''
>Preprocessing</a>
</li>
<li>
<button
type='button'
class='collapsed '>Model Selection<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/2.9.1/machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li>
<li><a href="/docs/2.9.1/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/2.9.1/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/machine-learning/multiclass-classification"
class=''
>Multiclass Classification</a>
</li>
<li>
<button
type='button'
class='collapsed '>Ensemble Methods<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/machine-learning/recommendation-systems"
class=''
>Recommendation Systems</a>
</li>
<li>
<button
type='button'
class='collapsed '>Importing Model<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/importing-model/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li>
<li><a href="/docs/2.9.1/machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li>
</nav>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/key-value-api/continuous-queries" class='' >Using Continuous Queries</a>
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/memory-configuration/eviction-policies.adoc" target="_blank">Edit</a>
<h1>Eviction Policies</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>When <a href="/docs/2.9.1/persistence/native-persistence">Native Persistence</a> is off, Ignite holds all cache entries in the off-heap memory and allocates pages as new data comes in.
When a memory limit is reached and Ignite cannot allocate a page, some of the data must be purged from memory to avoid OutOfMemory errors.
This process is called <em>eviction</em>. Eviction prevents the system from running out of memory but at the cost of losing data and having to reload it when you need it again.</p>
</div>
<div class="paragraph">
<p>Eviction is used in following cases:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>for off-heap memory when <a href="/docs/2.9.1/persistence/native-persistence">Native Persistence</a> is off;</p>
</li>
<li>
<p>for off-heap memory when Ignite is used with an <a href="/docs/2.9.1/persistence/external-storage">external storage</a>;</p>
</li>
<li>
<p>for <a href="/docs/2.9.1/configuring-caches/on-heap-caching">on-heap caches</a>;</p>
</li>
<li>
<p>for <a href="/docs/2.9.1/configuring-caches/near-cache">near caches</a> if configured.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>When Native Persistence is on, a similar process — called <em>page replacement</em> — is used to free up off-heap memory when Ignite cannot allocate a new page.
The difference is that the data is not lost (because it is stored in the persistent storage), and therefore you are less concerned about losing data than about efficiency.
Page replacement is automatically handled by Ignite and is not user-configurable.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="off-heap-memory-eviction">Off-Heap Memory Eviction</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Off-heap memory eviction is implemented as follows.</p>
</div>
<div class="paragraph">
<p>When memory usage exceeds the preset limit, Ignite applies one of the preconfigured algorithms to select a memory page that is most suitable for eviction.
Then, each cache entry contained in the page is removed from the page.