Senior LevelPostgreSQL
How do custom extensions register Custom WAL Resource Managers in Postgres 15+?
❓ Interview Prompt: Explain Custom WAL Resource Managers (Postgres 15+), `rmgr` registration, logging custom extension WAL records, and crash recovery.
PostgreSQL 15+ allows third-party extensions to register Custom WAL Resource Managers ('rmgr'):
Significance:
Extensions (such as custom index types or storage engines) can write custom binary WAL records and register recovery handlers, ensuring full crash safety and replication support for custom extension data!
Code Implementation Example
c
// Registering Custom WAL Resource Manager in C extension (Postgres 15+)
static RmgrData custom_rmgr = {
.rm_name = "custom_ext_rmgr",
.rm_redo = custom_ext_redo
};
void _PG_init(void) {
RegisterCustomRmgr(RM_EXPERIMENTAL_ID, &custom_rmgr);
}💡Registering a Custom WAL Resource Manager in C (Postgres 15+).
🎯 Interview Key Takeaway
Custom WAL Resource Managers enable extensions to log custom WAL records and support full crash recovery.
#WAL Resource Manager#Custom WAL#Postgres 15#Senior
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