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Posted to commits@carbondata.apache.org by xu...@apache.org on 2018/07/26 01:16:47 UTC
carbondata git commit: [CARBONDATA-2783][BloomDataMap][Doc] Update
document for bloom filter datamap
Repository: carbondata
Updated Branches:
refs/heads/master 316e9de65 -> 232f6ced3
[CARBONDATA-2783][BloomDataMap][Doc] Update document for bloom filter datamap
add example for enable/disable datamap
This closes #2554
Project: http://git-wip-us.apache.org/repos/asf/carbondata/repo
Commit: http://git-wip-us.apache.org/repos/asf/carbondata/commit/232f6ced
Tree: http://git-wip-us.apache.org/repos/asf/carbondata/tree/232f6ced
Diff: http://git-wip-us.apache.org/repos/asf/carbondata/diff/232f6ced
Branch: refs/heads/master
Commit: 232f6ced3944b437539ae9f1ad05c62441d44f46
Parents: 316e9de
Author: Manhua <ke...@qq.com>
Authored: Wed Jul 25 16:51:49 2018 +0800
Committer: xuchuanyin <xu...@hust.edu.cn>
Committed: Thu Jul 26 09:15:17 2018 +0800
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docs/datamap/bloomfilter-datamap-guide.md | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/carbondata/blob/232f6ced/docs/datamap/bloomfilter-datamap-guide.md
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diff --git a/docs/datamap/bloomfilter-datamap-guide.md b/docs/datamap/bloomfilter-datamap-guide.md
index 0fb3ba2..325a508 100644
--- a/docs/datamap/bloomfilter-datamap-guide.md
+++ b/docs/datamap/bloomfilter-datamap-guide.md
@@ -26,7 +26,16 @@ Showing all DataMaps on this table
SHOW DATAMAP
ON TABLE main_table
```
-It will show all DataMaps created on main table.
+
+Disable Datamap
+> The datamap by default is enabled. To support tuning on query, we can disable a specific datamap during query to observe whether we can gain performance enhancement from it. This will only take effect current session.
+
+ ```
+ // disable the datamap
+ SET carbon.datamap.visible.dbName.tableName.dataMapName = false
+ // enable the datamap
+ SET carbon.datamap.visible.dbName.tableName.dataMapName = true
+ ```
## BloomFilter DataMap Introduction