Booth will not be fixed by removing the database, the logical issue is still there, it will come up with a other face. How could it be that a db level got increased without apply the migration? Or other current issues the SN tries to write a data set which is already there and will break a constraint. For example i saw errors that tables were missing, the point is this should not be possible, for that are the migration scripts and db levels there. Removing the database will not be the solution in that case, it will only move the problem else were. Some of the problems are logical problems that are caused by incorrect error handling. The database byitself is not corrupted, the data within the database has not the state which the SN expect. Ensure your clustered index is such that new records will always be inserted at the end of the table (an identity column will do just fine). Remove all indexes, except for those needed by the insert. I fully aggree to you it is to high, but i wouldn’t call it a database corruption although it feels like that and is also called that here. To get the best possible performance you should: Remove all triggers and constraints on the table. Btw there is no need for concurrent access from other apps, this will mean writes can easily queued within the SN. The devs did already a lot, and the end of optimisation is not reached. To get some kind of data integrity looking is necessary. These kind of limitations are shared in all Databases, sqlite lock the hole database, other systems doing this by table or row depending of the kind of request. In fact, a properly designed (and used) SQLite database can be at least on par with an alternative database operated on the same machine (given the resource constraints are not endless). The engineers are working on solving that as soon as possible. (This means, that when someone runs our binary in the near future, we dont like to force the user to have to install those additional databases, especially as it makes the operation much more complicated)īesides these requirements that just came to my mind (there are probably more), we know that the current implementation (as of right now) has problems regarding the performance. Have the ability to be used with standalone binaries besides/instead of docker and not requiring other installs like MariaDB, MongoDB, PostgreSQL and similar on your PC.Easy to migrate/move (have the ability to move the database in case of a failure prediction of the hardware its running on.Needs to be easy to install (preferable not require any user interaction).The 5'th parameter of sqlite3_exec() might be useful - it's error message in text format.There are a few simple requirements and reasons for why we chose SQLite as the database backend for the Storagenodes. In your case (executing inserts) callback isn't needed. You can replace your calls to sqlite3_prepare_v2(), sqlite3_step() and sqlite3_finalize() by single call to sqlite3_exec() and providing a callback function if it's more convenient. Notice that sqlite3_exec() also returns error code if any error occur. Int sqlRet = sqlite3_finalize(stmt) // sqlRet will contain error code I would try to move transaction's commit. You call it inside another sqlite3_prepare_v2() \ sqlite3_finalize() block and even if it's a legal operation, you commit transaction before all queries have been finished. Automatically started transactions are committed when the last SQL statement finishes. Any command that accesses the database (basically, any SQL command, except a few PRAGMA statements) will automatically start a transaction if one is not already in effect. The second thing I want to mention here - sqlite3_exec() is a wrapper around sqlite3_prepare_v2(), sqlite3_step() and sqlite3_finalize(). No reads or writes occur except within a transaction. So if there is any error, you will catch it and find its explanation in the official documentation. I would check the return value of sqlite3_finalize() - it returns SQLITE_OK (which is equal 0) or an error code if any.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |