{"Entry":{"collection":"conn","key":"sslcompression","name":"sslcompression","aliases":["PGSSLCOMPRESSION","sslcompression"],"metadata":{"aliases":["PGSSLCOMPRESSION","sslcompression"],"category":"TLS","content_hash":"1b6b3ee1adddddd44633f6e1a04d3764786e2ccac2312b2ab0efa9280ae73033","derived_content_hash":"8b03e9151fc81d8054793b3620b280988a814fd378ba391f023d2493cde500c3","documentation_refresh":{"batch":"20261113","original_source_rev":"","versions":{"14":"14.25","15":"15.20","16":"16.16","17":"17.12","18":"18.7","19":"19rc2"}},"imported_at":"2026-09-30T00:40:35.10936+08:00","name":"sslcompression","name_zh":"","slug":"sslcompression","summary":"If set to 1, data sent over SSL connections will be compressed. If set to 0, compression will be disabled. The default is 0. 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PostgreSQL 14 disabled compression completely in the backend."],"definition":"If set to 1, data sent over SSL connections will be compressed. If set to 0, compression will be disabled. The default is 0. This parameter is ignored if a connection without SSL is made. SSL compression is nowadays considered insecure and its use is no longer recommended. OpenSSL 1.1.0 disabled compression by default, and many operating system distributions disabled it in prior versions as well, so setting this parameter to on will not have any effect if the server does not accept compression. PostgreSQL 14 disabled compression completely in the backend. If security is not a primary concern, compression can improve throughput if the network is the bottleneck. 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If set to 0, compression will be disabled. The default is 0. This parameter is ignored if a connection without SSL is made.\u003c/p\u003e\n\u003cp\u003eSSL compression is nowadays considered insecure and its use is no longer recommended. \u003cspan class=\"productname\"\u003eOpenSSL\u003c/span\u003e 1.1.0 disabled compression by default, and many operating system distributions disabled it in prior versions as well, so setting this parameter to on will not have any effect if the server does not accept compression. \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e 14 disabled compression completely in the backend.\u003c/p\u003e\n\u003cp\u003eIf security is not a primary concern, compression can improve throughput if the network is the bottleneck. Disabling compression can improve response time and throughput if CPU performance is the limiting factor.\u003c/p\u003e\n\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e","manual_path":"libpq-connect.html#LIBPQ-CONNECT-SSLCOMPRESSION","precedence_evidence":["The following environment variables can be used to select default connection parameter values, which will be used by PQconnectdb , PQsetdbLogin and PQsetdb if no value is directly specified by the calling code. These are useful to avoid hard-coding database connection information into simple client applications, for example.","Service names can be defined in either a per-user service file or a system-wide file. If the same service name exists in both the user and the system file, the user file takes precedence. By default, the per-user service file is named ~/.pg_service.conf . 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