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Update postgresql data migration guide #3223

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merged 2 commits into from
Jan 27, 2022
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Update postgresql data migration guide #3223

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97321be
add flags to speed up create index
xin-hedera Jan 27, 2022
48a790c
fix format
xin-hedera Jan 27, 2022
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11 changes: 8 additions & 3 deletions docs/database.md
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Expand Up @@ -21,8 +21,8 @@ data, configure the new PostgreSQL instance, and restore the data.

- Importer for the old PostgreSQL database instance is stopped
- The new PostgreSQL database instance
- An ubuntu virtual machine with fast network speed connections to both PostgreSQL database instances. The instance should also have
enough free disk space for the database dump
- An ubuntu virtual machine with fast network speed connections to both PostgreSQL database instances. The instance
should also have enough free disk space for the database dump

### Backup

Expand Down Expand Up @@ -53,11 +53,16 @@ The following configuration needs to be applied to the database instance to impr

```
checkpoint_timeout = 30m
maintenance_work_mem = 2GB
max_parallel_maintenance_workers = 4
max_wal_size = 512GB
temp_file_limit = 2147483647kB
```

Note: once the data is restored, revert the values back for normal operation.
Note:
- Not all flags are available in managed database services. For example, `max_parallel_maintenance_workers` is not
available in Google Cloud SQL.
- Once the data is restored, revert the values back for normal operation.

### Restore

Expand Down