To keep a standard Cloud installation for all customers and improve our ability to troubleshoot and provide support, we do not provide superuser access to Cloud clusters. Thus customers are not able to install PostgreSQL extensions themselves.

Generally there is no need to install extensions, however, because every Cloud cluster comes pre-loaded with many useful ones:

Name Version Schema Description
btree_gin 1.2 public support for indexing common datatypes in GIN
btree_gist 1.5 public support for indexing common datatypes in GiST
citext 1.4 public data type for case-insensitive character strings
citus 8.1-1 pg_catalog Citus distributed database
cube 1.2 public data type for multidimensional cubes
dblink 1.2 public connect to other PostgreSQL databases from within a database
earthdistance 1.1 public calculate great-circle distances on the surface of the Earth
fuzzystrmatch 1.1 public determine similarities and distance between strings
hll 2.12 public type for storing hyperloglog data
hstore 1.4 public data type for storing sets of (key, value) pairs
intarray 1.2 public functions, operators, and index support for 1-D arrays of integers
ltree 1.1 public data type for hierarchical tree-like structures
pg_buffercache 1.3 public examine the shared buffer cache
pg_cron 1.0 public Job scheduler for PostgreSQL
pg_freespacemap 1.2 public examine the free space map (FSM)
pg_partman 4.0.0 partman Extension to manage partitioned tables by time or ID
pg_prewarm 1.1 public prewarm relation data
pg_stat_statements 1.5 public track execution statistics of all SQL statements executed
pg_trgm 1.3 public text similarity measurement and index searching based on trigrams
pgcrypto 1.3 public cryptographic functions
pgrowlocks 1.2 public show row-level locking information
pgstattuple 1.5 public show tuple-level statistics
plpgsql 1.0 pg_catalog PL/pgSQL procedural language
session_analytics 1.0 public  
shard_rebalancer 8.1 public  
sslinfo 1.2 public information about SSL certificates
tablefunc 1.0 public functions that manipulate whole tables, including crosstab
topn 2.1.0 public type for top-n JSONB
unaccent 1.1 public text search dictionary that removes accents
uuid-ossp 1.1 public generate universally unique identifiers (UUIDs)
xml2 1.1 public XPath querying and XSLT