# LINEAR HASH Partitioning Type

## Syntax

```sql
PARTITION BY LINEAR HASH (partitioning_expression)
[PARTITIONS(number_of_partitions)]
```

## Description

`LINEAR HASH` partitioning is a form of [partitioning](https://mariadb.com/docs/server/server-usage/partitioning-tables), similar to [HASH partitioning](https://mariadb.com/docs/server/server-usage/partitioning-tables/partitioning-types/hash-partitioning-type), in which the server takes care of the partition in which to place the data, ensuring a relatively even distribution among the partitions.

`LINEAR HASH` partitioning makes use of a powers-of-two algorithm, while `HASH` partitioning uses the modulus of the hashing function's value. Adding, dropping, merging and splitting partitions is much faster than with the [HASH partitioning type](https://mariadb.com/docs/server/server-usage/partitioning-tables/partitioning-types/hash-partitioning-type), however, data is less likely to be evenly distributed over the partitions.

## Example

```sql
CREATE OR REPLACE TABLE t1 (c1 INT, c2 DATETIME) 
  PARTITION BY LINEAR HASH(TO_DAYS(c2)) 
  PARTITIONS 5;
```

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

{% @marketo/form formId="4316" %}