The subquery is evaluated only once because it has no dependency on the row to update. You may add one, just to force the engine to evaluate the subquery for each row. For instance if dest_col is a ...
answered Aug 23, 2018 at 14:36 Efficient key value store in PostgresNumber one: PostgreSQL will never be great as a key-value store if you have many UPDATEs. Workloads with many UPDATEs are just hard for PostgreSQL's architecture. Make sure that you create your table ...
answered Dec 6, 2019 at 12:57 Mysql query works in 200ms with 33594 parameters in SELECT IN (xx,xxx,xx) but runs hours with 33595 or more parameters, why?I'm more curious about why this happens to understand what's the limit... The why is because it's an overly complicated predicate. The IN clause is syntactical sugar for a bunch of OR clauses. Too ...
answered Apr 25, 2023 at 12:39 UNION Queries run in Parallel form or notMySQL does not use multiple CPUs for any query, not even with UNION or PARTITION (the likely candidates). Multiple connections (not just multiple threads) could do things in parallel. But the ...
answered Oct 19, 2017 at 6:00 IMPORT FOREIGN SCHEMA fails with Password error for 127.0.0.1 but not for remote IP (of same server)The problem is that when you connect locally, PostgreSQL does not demand a password. So while the user mapping might define a password, that password can't be used as it is never asked for. If it ...
answered Mar 29, 2021 at 20:59 How do I see where postgres privileges are coming from for a role?The permissions are stored on the individual objects, and there is no central view to see them all. You could use the access privilege inquiry functions for each type of object to get that information....
answered May 6, 2021 at 2:00 ERROR: role "user1" cannot be dropped because some objects depend on it06:42:36.347 UTC [199]: [2-1] db=cloudsqladmin,user=cloudsqlagent DETAIL: privileges for database mydb 24 objects in database mydb Crossdatabase queries in PostgreSQL are not implemented. PostgreSQL ...
answered Dec 5, 2020 at 14:08 Can a new transaction claim an older sequence id?Is it expected that this can happen. A newer transaction claiming a lower seq value? Yes. The formulation "claiming a lower seq value" is fuzzy. You seem to be thinking "writing a ...
answered Oct 13, 2024 at 2:06 GCP MySQL query loggingIt's all documented here and here. Relevant part: To make your general or slow query logs available, enable the corresponding flag and set the log_output flag to FILE. This makes the log ...
answered Apr 18, 2019 at 19:32 ERROR 2003 (HY000): Can't connect to MySQL server on 'xxx.xxx.xx.xx' (10060)I had a similar issue. I believe there are two ways to resolve it (though only one worked for me). The first way (that did not work for me) would be to create a client certificate via the Cloud ...
answered Jun 21, 2017 at 16:00 Half of the partitions are empty on a KEY partitionYou have 100 partitions. So it's likely that your hash values modulus 100 are all even numbers. This is a general risk of hashing. If the hashing function produces only values with a pattern like this,...
answered Mar 1, 2021 at 15:14 Efficient key value store in PostgresYour benchmarking program creates two hash indexes, one to support the constraint, and another free standing one which seems to serve no purpose. Also, 100 iterations is by no means sufficient to ...
answered Dec 9, 2019 at 20:18 How do you know when it's time to upgrade a RDBMS/SQL database infrastructure? What metrics to follow?Unfortunately this is not a simple matter. There is much black art and experience involved because you are dealing with a few different but strongly coupled matters. First you are trying to decide if ...
answered Nov 14, 2018 at 11:29 UPDATE incredibly slow on small PostgreSQL query - EXPLAIN ANALYZE causes it to hang1+GB size for a table with 2k rows means either it has huge text columns or it is highly bloated. Why don't you try running vacuum (analyze, full) against the database in question (if you haven't ...
answered Feb 8, 2022 at 6:35 Postgres allows to UPDATE however only SELECT is granted=arwdDxt/dave means all privileges are granted to the pseudo-role PUBLIC, of which anton is obviously a member. The documentation states that any particular role will have the sum of privileges ...
answered Oct 5, 2022 at 20:49 Why does the page cleaner in MySQL 8 increase the number of active connections to the database?This depends on what the OS has configured In the MySQL 8.0 Documentation on innodb_page_cleaners, it says in part If your workload is write-IO bound when flushing dirty pages from buffer pool ...
answered Feb 1, 2023 at 23:53 Half a million rows deleted still showing same disk size as before in phpMyAdminHow is this being calculated - is there some place where the deleted rows exists which is still being counted as 450MB ? Acquiring space from the disk is a resource intensive task. Most database ...
answered Oct 23, 2023 at 12:53 Half a million rows deleted still showing same disk size as before in phpMyAdminMySQL fails to shrink disk usage when deleting rows. Instead, it leaves the free space in the file for future INSERTs. This SQL may shrink the table for you: OPTIMIZE TABLE tablename. (I say "...
answered Nov 7, 2023 at 21:59 can't backup postgres 13 with pg_dumpFor supplying credentials to any PostgreSQL utility, I would strongly recommend using the Postgres Password File instead of trying to pass passwords around in variables. Why? You have to get those ...
answered Sep 20, 2021 at 10:58 Online schema changes for cloudsql DBALTER TABLE t MODIFY COLUMN c ENUM(...) ... If that is only adding a new option on the end and not going past 255 options, that should be a "schema-only" change that happens instantly. (...
answered May 23, 2021 at 6:43 IMPORT FOREIGN SCHEMA fails with Password error for 127.0.0.1 but not for remote IP (of same server)Building on top of jjanes's answer—for those still looking for an answer in an environment where you have control, you need to disable local trust for all users by modifying the following line in your ...
answered Jan 18, 2022 at 0:40 can any tweaks improve full table scan time in Postgres/Cloud SQL?Counting all rows is notoriously slow. Only fast storage and RAM can help. But the task at hand can be much faster, as you obviously don't need a full count: to see if I had set any values yet ...
answered Oct 18, 2023 at 4:07 can any tweaks improve full table scan time in Postgres/Cloud SQL?Obviously faster storage and more RAM for caching can improve performance of a sequential scan. Other than that, you can increase max_parallel_workers_per_gather on recent PostgreSQL versions to have ...
answered Oct 16, 2020 at 7:06 Postgresql sudden storage increase at regular interval?Since you have no filesystem access you won't get the answer but some guesses only, so here comes mine: if there are no bulk INSERTs, this might be some temporary space created by SELECT, for example ...
answered Jul 20, 2020 at 6:07 migrate users from mariadb10.1 to mysql5.7Use pt-show-grants utility to generate a "logical dump" of your accounts and grants. You can do the same thing manually if you just run show grants for for each user, but this percona-toolkit utility ...
answered Nov 13, 2019 at 17:05 Speed up 180M+ rows returned by simple SELECT with PostgreSQLAs you mentioned you are trying to get 80% of the rows of your table and it is normal that postgreSQL optimizer decide to scan the table rather than get data from the index. Unfortunately postgres ...
answered Sep 11, 2019 at 9:25 Removing MySQL Orphan Tables in Google's Managed MySQLYour theory is correct about your cloudSQL since it is a Google managed service. If you would like to have full access over your mysql database, you can use it through a Compute Engine instance in ...
answered Aug 12, 2019 at 9:31RetroSearch is an open source project built by @garambo | Open a GitHub Issue
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