class Storage::KeyValueStore

• Storage::KeyValueStore
• Reference
• Object

Defined in:

storage/kv.cr
storage/migrations.cr

Constant Summary

HARD_DURABILITY = RocksDB::WriteOptions.new

Hard durability: data is written on disk always. This is the default and this is paranoic. No data will be lost, ever.

MINIMAL_DURABILITY = RocksDB::WriteOptions.new

Minimal durability: data it stored in memory only and flushed to disk at some later point. A process crash might cause data loss. A graceful server close (calling .close()) won't lose data. Note: The data might be lost, but it won't be corrupted. This is the fastest option.

PREFIX_DATABASES = 1_u8

PREFIX_INDICES = 3_u8

PREFIX_SYSTEM_INFO = 0_u8

PREFIX_TABLES = 2_u8

SOFT_DURABILITY = RocksDB::WriteOptions.new

Soft durability: data is sent to the operating system memory and will be synced to disk later. Only a kernel panic or hardware failure might cause data loss. Crashing the process won't lose any data.

Constructors

• .new(database_path : String)

Class Method Summary

• .decompose_index_entry_key(index_entry_key : Bytes)
• .key_for_database(id : UUID)
• .key_for_system_info
• .key_for_table(id : UUID)
• .key_for_table_index(table_id : UUID, index_id : UUID)
• .key_for_table_index_end(table_id : UUID)
• .key_for_table_index_entry(index_value : Bytes, counter : Int32, primary_key : Bytes)
• .key_for_table_index_entry_end(index_value : Bytes)
• .key_for_table_index_entry_start(index_value : Bytes)
• .key_for_table_index_start(table_id : UUID)

Instance Method Summary

• #build_index(table_id : UUID, index_id : UUID, &)
• #close
• #create_batch
• #database_path : String
• #delete_index_entry(table_id : UUID, index_id : UUID, index_value : Bytes, counter : Int32, primary_key : Bytes)
• #delete_row(table_id : UUID, primary_key : Bytes, durability : ReQL::Durability = ReQL::Durability::Soft) : Bytes | Nil
• #drop_index_data(index_id : UUID)
• #each_db(&)
• #each_index(table_id : UUID, &)
• #each_index_entry(table_id : UUID, index_id : UUID, index_value_start : Bytes, index_value_end : Bytes, snapshot : RocksDB::BaseSnapshot | Nil = nil, &)
• #each_row(table_id : UUID, &)
• #each_table(&)
• #estimated_table_count(table_id : UUID)
• #get_db(id : UUID)
• #get_row(table_id : UUID, primary_key : Bytes, snapshot : RocksDB::BaseSnapshot | Nil = nil, &)
• #get_table(id : UUID)
• #save_db(db : DatabaseInfo)
• #save_index(index : IndexInfo)
• #save_table(table : TableInfo)
• #set_index_entry(table_id : UUID, index_id : UUID, index_value : Bytes, counter : Int32, primary_key : Bytes)
• #set_row(table_id : UUID, primary_key : Bytes, data : Bytes, durability : ReQL::Durability = ReQL::Durability::Soft)
• #snapshot
• #system_info : Storage::KeyValueStore::SystemInfo
• #system_info=(system_info : Storage::KeyValueStore::SystemInfo)
• #table_data_family(table_id : UUID)
• #table_index_family(index_id : UUID)
• #write_batch(batch, durability : ReQL::Durability = ReQL::Durability::Soft)

Constructor Detail

Class Method Detail

Instance Method Detail