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| -rw-r--r-- | docs/upgrade.md | 40 |
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diff --git a/docs/upgrade.md b/docs/upgrade.md index a44960c2b8..011aadf638 100644 --- a/docs/upgrade.md +++ b/docs/upgrade.md @@ -84,7 +84,45 @@ process, for example: wget https://packages.matrix.org/debian/pool/main/m/matrix-synapse-py3/matrix-synapse-py3_1.3.0+stretch1_amd64.deb dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb ``` - + + +# Upgrading to v1.38.0 + +## Re-indexing of `events` table on Postgres databases + +This release includes a database schema update which requires re-indexing one of +the larger tables in the database, `events`. This could result in increased +disk I/O for several hours or days after upgrading while the migration +completes. Furthermore, because we have to keep the old indexes until the new +indexes are ready, it could result in a significant, temporary, increase in +disk space. + +To get a rough idea of the disk space required, check the current size of one +of the indexes. For example, from a `psql` shell, run the following sql: + +```sql +SELECT pg_size_pretty(pg_relation_size('events_order_room')); +``` + +We need to rebuild **four** indexes, so you will need to multiply this result +by four to give an estimate of the disk space required. For example, on one +particular server: + +``` +synapse=# select pg_size_pretty(pg_relation_size('events_order_room')); + pg_size_pretty +---------------- + 288 MB +(1 row) +``` + +On this server, it would be wise to ensure that at least 1152MB are free. + +The additional disk space will be freed once the migration completes. + +SQLite databases are unaffected by this change. + + # Upgrading to v1.37.0 ## Deprecation of the current spam checker interface |