---
title: Frequently Asked Questions
date: "2026-09-05"
vignette: >
  %\VignetteIndexEntry{Frequently Asked Questions}
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---





**storr.tiledb FAQ**

***


#### Q: Can I change the storr's hash algorithm?
  
Yes, by using driver's active field `$hash_algorithm`:


``` r
# URI path
uri <- tempfile()

# Create a storr with "sha256" digest
sto <- storr_tiledb(uri, init = TRUE, hash_algorithm = "sha256")

sto$set("a", 1)

sto$get_hash("a")
# [1] "55d98602c58516fba3b169ccfebb0edc98fe5af34f86f82822125c4521273da3"
```

Change the hash algorithm as follows:

``` r
# Initialise the driver
dr <- driver_tiledb(uri)

# Check its hash algo
dr$hash_algorithm
# [1] "sha256"

# Change hash digest to 'md5'
dr$hash_algorithm <- 'md5'

dr$hash_algorithm
# [1] "md5"
```

Reopen storr to pick up the new hash algorithm:


``` r
# Open new storr instance
sto <- storr_tiledb(uri)

sto$set("a", 1)

# key 'a' is hashed with 'md5'
sto$get_hash("a")
# [1] "38e42db36c4414f7bbc19d750f71a721"
```

#### Q: How can I rehash the entire key-value storr?

You need to create a new storr with the desired hash algorithm,
and then export from source storr to the new one.


``` r
# source storr
uri <- tempfile()
sto <- storr_tiledb(uri, init = TRUE)
sto$set("a", 1)
sto$get_hash("a")
# [1] "38e42db36c4414f7bbc19d750f71a721"
```


``` r
# create a storr with new hash algorithm
uri_dest <- tempfile()
sto_dest <- storr_tiledb(uri_dest, init = TRUE, hash_algorithm = "blake3")
```

Now, export from source to destination storr using the class method
`$export_tdb()`:

``` r
sto$export_tdb(uri_dest = uri_dest)

# check
sto_dest$set("a", 1)
sto_dest$get_hash("a")
# [1] "235cda51f465ddead90eb33b8aa23d485dfa7bc6b7cbd642ef3f06ecc8197569"
```