compact (#105)

* compact

* add-toc

* fix wum

* fix wum2

docs/manual-EN/3.build-develop-and-administration/5.storage-service-administration/compact.md

@@ -0,0 +1,13 @@
+# Compact
+
+This document will walk you through the concept of Compact.
+
+1. Start or stop compact with the `UPDATE CONFIG disable_auto_compactions=false/true` command. This method calls the default RocksDB compact. You can use it to merge sst files in small scale during data writing to ensure the read speed in a short time. This kind of compact is usually performed in the day time.
+2. Start compact with the `SUBMIT JOB COMPACT` command. This method calls the customized compact of **Nebula Graph**. You can use it to perform large scale background operations such as sst files merging in large scale or TTL. This kind of compact is usually performed after midnight.
+
+In addition, you can modify the number of threads in both methods by the following command. You can decrease the threads during daytime and increase it at night.
+
+```ngql
+nebula> UPDATE CONFIGS storage:rocksdb_db_options  = \
+        { max_subcompactions = 4, max_background_jobs = 4};
+```

docs/manual-EN/README.md

@@ -141,6 +141,7 @@ It is the optimal solution in the world capable of hosting graphs with dozens of
   * [Storage Balance](3.build-develop-and-administration/5.storage-service-administration/storage-balance.md)
   * [Cluster Snapshot](3.build-develop-and-administration/5.storage-service-administration/cluster-snapshot.md)
   * [Long Time-Consuming Task Management](3.build-develop-and-administration/5.storage-service-administration/job-manager.md)
+  * [Compact](3.build-develop-and-administration/5.storage-service-administration/compact.md)
 * Monitoring and Statistics
   <!-- * [Connect Prometheus](3.build-develop-and-administration/7.monitor/0.connect-prometheus.md) -->
   * [Metrics](3.build-develop-and-administration/7.monitor/1.metrics-exposer.md)

mkdocs.yml

@@ -183,6 +183,7 @@ nav:
           - Storage Balance: manual-EN/3.build-develop-and-administration/5.storage-service-administration/storage-balance.md
           - Cluster Snapshot: manual-EN/3.build-develop-and-administration/5.storage-service-administration/cluster-snapshot.md
           - Long Time-Consuming Task Management: manual-EN/3.build-develop-and-administration/5.storage-service-administration/job-manager.md
+          - Compact: manual-EN/3.build-develop-and-administration/5.storage-service-administration/compact.md
 
       - Monitoring and Statistics:
         # - Connect Prometheus: manual-EN/3.build-develop-and-administration/7.monitor/0.connect-prometheus.md