iavl

ww.google.com/search?q=Merkle+hashes+for+SQlite A git commit hash is basically a Merkle tree root, as it depends upon the previous hashes before it. Merkle tree: https://en.wikipedia.org/wiki/Merkle_tree (How) Should merkle hashes be added to sqlite for consistency? How would merkle hashes in sqlite differ from WAL checksums?

og, and checkpoint? DLT applications for strong transactional consistency sign and synchronize block messages and transaction messages. Public blockchains have average transaction times and costs. Private blockchains also have TPS Transactions Per Second metrics, and unknown degrees of off-site redundancy for consistent storage with or without indexes. Blockchain#Openness: https://en.wikipedia.org/wiki/Blockchain#Openness : > An issue in this ongoing debate is whether a private system with verifiers tasked and authorized (permissioned) by a central authority should be considered a blockchain. [46][47][48][49][50] Proponents of permissioned or private chains argue that the term "blockchain" may be applied to any data structure that batches data into time-stamped blocks. These blockchains serve as a distributed version of multiversion concurrency control (MVCC) in databases. [51] Just as MVCC prevents two transactions from concurrently modifying a single object in a database, blockchains prevent two transactions from spending the same single output in a blockchain. [52] > Opponents say that permissioned systems resemble traditional corporate databases, not supporting decentralized data verification, and that such systems are not hardened against operator tampering and revision. [46][48] Nikolai Hampton of Computerworld said that "many in-house blockchain solutions will be nothing more than cumbersome databases," and "without a clear security model, proprietary blockchains should be eyed with suspicion." [10][53] Merkle Town: https://news.ycombinator.com/item?id=38829274 : > How CT works > "How CT fits into the wider Web PKI ecosystem": https://certificate.transparency.dev/howctworks/ From "PostgreSQL Support for Certificate Transparency Logs Now Available" https://news.ycombinator.com/item?id=42628223 : > Are there Merkle hashes between the rows in the PostgreSQL CT store like there are in the Trillian CT store? > Sigstore Rekor also has centralized Merkle hashes.

red memory Are the major SQL file formats already SIMD optimized and zero-copy across TCP/IP? Arrow doesn't do full or partial indexes. Apache Arrow supports Feather and Parquet on-disk file formats. Feather is on-disk Arrow IPC, now with default LZ4 compression or optionally ZSTD. Some databases support Parquet as the database flat file format (that a DBMS process like PostgreSQL or MySQL provides a logged, permissioned, and cached query interface with query planning to). IIUC with Parquet it's possible both to use normal tools to offline query data tables as files on disk and also to online query tables with a persistent process with tunable parameters and optionally also centrally enforce schema and referential integrity. From https://stackoverflow.com/questions/48083405/what-are-the-di... : > Parquet format is designed for long-term storage, where Arrow is more intended for short term or ephemeral storage > Parquet is more expensive to write than Feather as it features more layers of encoding and compression. Feather is unmodified raw columnar Arrow memory. We will probably add simple compression to Feather in the future. > Due to dictionary encoding, RLE encoding, and data page compression, Parquet files will often be much smaller than Feather files > Parquet is a standard storage format for analytics that's supported by many different systems: Spark, Hive, Impala, various AWS services, in future by BigQuery, etc. So if you are doing analytics, Parquet is a good option as a reference storage format for query by multiple systems Those systems index Parquet. Can they also index Feather IPC, which an application might already have to journal and/or log, and checkpoint? Edit: What are some of the DLT solutions for indexing given a consensus-controlled message spec designed for synchronization? - cosmos/iavl: a Merkleized AVL+ tree (a balanced search tree with Merkle hashes and snapshots to prevent tampering and enable synchronization) https://github.com/cosmos/iavl/blob/master/docs/overview.md - Google/trillion has Merkle hashed edges between rows in order in the table but is centralized - "EVM Query Language: SQL-Like Language for Ethereum" (2024) https://news.ycombinator.com/item?id=41124567 : [...]

kipedia.org/wiki/Self-balancing_binary_search_t... )

tor-set by voting power. There's more to it than that, but that's the gist of it. Now we can really, really securely know that a name resolves to a certain IP, and know that it would be extremely expensive to attack this system. NameCoin almost solved it but you need something like this to keep persistent state and provide Merkle proofs: https://github.com/tendermint/iavl . You can with the simple Bitcoin UTXO Merkle tree, but then you can't provide fast updates or revocation easily. p.s. anyone know why my parent post is getting downvoted? goes up and down, up and down ;)