The Sixth Execution
Prepared statements switch from custom plans to generic plans on the sixth execution, and that switch can make your queries mysteriously slow.
listen_addresses
Listen_addresses decides which TCP sockets exist on your server—but it says nothing about who can use them.
lo_compat_privileges
Turn off `lo_compat_privileges` unless you enjoy large objects being world-writable and nobody noticing.
local_preload_libraries
Load shared libraries per-session from a single curated directory, no superuser needed.
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lock_timeout
Prevent your migration from starving behind long-running queries.
krb_caseins_users and krb_server_keyfile
PostgreSQL's GSSAPI authentication relies on two server-wide settings: `krb_server_keyfile` points to a dedicated keytab file (never share the system one), and…
join_collapse_limit
PostgreSQL's one join-order hint isn't spelled like one: set `join_collapse_limit` to 1 and the planner joins tables in exactly the order you wrote them.
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jit_debugging_support, jit_dump_bitcode, and jit_profiling_support
Inspect the LLVM bitcode PostgreSQL generates with `jit_dump_bitcode`, or wire JIT-compiled functions into GDB and perf with `jit_debugging_support` and…