Greetings. My understanding is, there is no "auto compact" while the database is running. Instead it will be compacted only during shutdown and only within the defined shutdown time period (longer will give more time to compact).
And yes, H2 database consumes a lot of file space, especially when data are constantly written and deleted. I made exactly the same observation. Best regards Andreas On Mon, 2022-06-13 at 02:48 -0700, Ulrich wrote: > Hi all, > > I am running a H2 2.1.212 and I wonder why the automatic compact > feature does not shrink the database size. > > My application is continuously collecting data (around 100 inserts > per second). Most of the data is removed once a day. The data is kept > in 4300 tables. > > The database file size is around 5 GB. When running a manual SHUTDOWN > COMPACT it is compacted to 40 MB. > > I expected that the automatic compact algorithm of the MV_STORE is > able to keep the database smaller than it is. Are there any known > circumstances why the compact algorithm does not run or does not give > good results? > > I already tried to use the latest git code but the results are the > same. > > Here are some infos from the information_schema.settings table with > the relevant parameters: > > AUTO_COMPACT_FILL_RATE 90 > info.FILL_RATE 19 > info.CHUNKS_FILL_RATE 27 > info.CHUNKS_FILL_RATE_RW 27 > info.FILE_SIZE 4916121600 > info.CHUNK_COUNT 490 > info.PAGE_COUNT 1594967 > info.PAGE_COUNT_LIVE 440730 > info.PAGE_SIZE 4096 > info.CACHE_MAX_SIZE 16 > info.CACHE_SIZE 15 > info.CACHE_HIT_RATIO 85 > info.TOC_CACHE_HIT_RATIO 99 > info.LEAF_RATIO 44 > > Thanks! > Ulrich > -- > You received this message because you are subscribed to the Google > Groups "H2 Database" group. > To unsubscribe from this group and stop receiving emails from it, > send an email to h2-database+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/h2-database/ae5bf92d-f61a-4cac-981a-9e1b51d7d49fn%40googlegroups.com > . -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To unsubscribe from this group and stop receiving emails from it, send an email to h2-database+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/h2-database/9c480453482e2f1b81ddf85bedb15af8d68333ea.camel%40manticore-projects.com.
