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PS-10214 - Document changed ranges of variables in MyRocks 8.0 #579

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PS-10214 - Document changed ranges of variables in MyRocks 8.0 #579

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34 changes: 28 additions & 6 deletions docs/variables.md
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Expand Up @@ -490,9 +490,16 @@ Allowed range is from `1` to `2147483647`.
| Data type | Numeric |
| Default | 16 KB |

Specifies the size of the data block for reading RocksDB data files.
Specifies the size of the data blocks used for storing and reading RocksDB data files. Larger block sizes can improve compression efficiency and reduce metadata overhead, but may increase memory usage and read amplification.

The default value is `16 KB`.
The allowed range is from `1024` to `18446744073709551615` bytes.
The allowed range is from `1024` to `4294967296` bytes (4GiB).

#### Version change

As of Percona Server for MySQL 8.0.44-35, the maximum value has been reduced from `18446744073709551615` bytes to `4294967296` bytes (4GiB).

For versions before 8.0.44-35, the allowed range is from `1024` to `18446744073709551615` bytes.

### `rocksdb_block_size_deviation`

Expand Down Expand Up @@ -1564,7 +1571,7 @@ The variable was implemented in [Percona Server for MySQL 8.0.20-11](release-not

#### Version changes

The variable was implemented in [Percona Server for MySQL 8.0.25-15](release-notes/Percona-Server-8.0.25-15.md#id1).
The variable was implemented in [Percona Server for MySQL 8.0.25-15](./release-notes/Percona-Server-8.0.25-15.md).

#### Improving Write Throughput with Pipelined Writes

Expand Down Expand Up @@ -2007,8 +2014,14 @@ When enabled, this option allows index key prefixes longer than 767 bytes (up to
| Default | 1000 |

Specifies the maximum number of info log files to keep.
Default value is `1000`.
Allowed range is from `1` to `18446744073709551615`.
The default number is `1000`.
The allowed range is from `1` to `18446744073709551615`.

#### Version change

As of Percona Server for MySQL 8.0.44-35, Percona Server sets the minimum value to `1`.

For versions before 8.0.44-35, the minimum value was `0`.

### `rocksdb_lock_scanned_rows`

Expand Down Expand Up @@ -2227,7 +2240,16 @@ Tracks the history for at most `rockdb_mx_compaction_history` completed compacti

This variable has been implemented in [Percona Server for MySQL 8.0.36-28](.//release-notes/8.0.36-28.md).

This variable sets `DBOptions::max_file_opening_threads` for RocksDB. The default value is `16`. The minimum value is `1` and the maximum value is 2147483647 (`INT_MAX`).
This variable sets `DBOptions::max_file_opening_threads` for RocksDB, controlling the maximum number of threads that can be used to open files concurrently. This helps improve performance when opening multiple files simultaneously.

The default value is `16`.
The minimum value is `1` and the maximum value is `262144`.

#### Version change

As of Percona Server for MySQL 8.0.44-35, the maximum value has been reduced from `2147483647` (`INT_MAX`) to `262144`.

For versions before 8.0.44-35, the maximum value was `2147483647` (`INT_MAX`).

### `rocksdb_max_latest_deadlocks`

Expand Down
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