Worst case, some nodes would have the indexes created and some, not, but this won't affect database operations. For example, to create an index in PostgreSQL without locking a table, you can use the CONCURRENTLY keyword: You can create the index concurrently. It is not acceptable when your project is large enough to allow a downtime for such the small adjustment like a new index. SQLAlchemy is a SQL tool built with Python that provides developers with an abundance of powerful features for designing and managing high-performance databases.. We’ll briefly explore how to use SQLAlchemy and then dive deeper into how to execute raw SQL statements from within the comfort of the Python domain language. block cannot run yet, as it is dependent on one or more blocks to complete; (ii) enqueued , meaning that any thread that beco mes idle can steal and run it; (iii) running , at some thread T i . VACUUM cannot be executed inside a transaction block. That's also why functions are not exactly "stored procedures" (even though that term is used sometimes, misleadingly). RuntimeError: ERROR C25001 MVACUUM cannot run inside a transaction block Fxact. You cannot create a resource queue within a transaction block. Recreate all indexes within the current database. Indexes on shared system catalogs are also processed. There is a way to avoid the write-lock though. Well known fact is that PostgreSQL and many other RDBMS lock write access on the table while the index is being created. Recreate all indexes on system catalogs within the current database. Well known fact is that PostgreSQL and many other RDBMS lock write access on the table while the index is being created. PG::ActiveSqlTransaction: ERROR: CREATE INDEX CONCURRENTLY cannot run inside a transaction block We can help any future developer that hits this by providing a hint, let’s modify our defense code to add a nice statement about it. Indexes on shared system catalogs are included. The thing is: CREATE INDEX is a single transaction – CREATE INDEX CONCURRENTLY is not – and therefore it cannot be run inside a normal transaction block. The longer it takes to create the index, the longer the system is unavailable or unresponsive to users. For tables with GIN indexes, VACUUM (in any form) also completes any pending index insertions, by moving pending index entries to the appropriate places in the main GIN index structure. CREATE INDEX CONCURRENTLY is not supported in this fix due to complexity of multiple commits in the same transaction. VACUUM will skip over any tables that the calling user does not have permission to vacuum. This form of REINDEX cannot be executed inside a transaction block. There is a way to avoid the write-lock though. The index needs to be visible to other transactions … It is not acceptable when your project is large enough to allow a downtime for such the small adjustment like a new index. c L2649 RPreventTransactionChain: VACUUM ... {CREATE INDEX CONCURRENTLY index_reservations_subscription_id ON reservations (subscription_id);} end def down execute %{DROP INDEX index_reservations_subscription_id} end end. Some commands like VACUUM, CREATE INDEX CONCURRENTLY or CREATE DATABASE cannot run inside a transaction block, so they are not allowed in functions. Example: postgres=> begin; BEGIN postgres=> CREATE RESOURCE QUEUE test_q WITH (ACTIVE_STATEMENTS=3, PRIORITY=MAX); ERROR: CREATE RESOURCE QUEUE cannot run inside a transaction block You can create the index concurrently. (Neither in SQL procedures, yet, as of Postgres 11. Some database vendors provide a way to create an index without locking the table. SYSTEM. The most prominent thing is most likely CREATE INDEX CONCURRENTLY. 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