4.6 KiB
PRAGMA Directives
You can issue PRAGMA directives to rqlite, and they will be passed to the underlying SQLite database. Certain PRAGMA directives, which alter the operation of the SQLite database, may not make sense in the context of rqlite (since rqlite does not given direct control over its connections to the SQLite database). Furthermore some PRAGMA directives may even break rqlite. If you have questions about a specific PRAGMA directive, the rqlite Google Group is a good place to start the discussion.
PRAGMA directives which just return information about the SQLite database, without changing its operation, are always safe.
Issuing a PRAGMA directive
The rqlite CLI supports issuing PRAGMA directives. For example:
127.0.0.1:4001> pragma compile_options
+----------------------------+
| compile_options |
+----------------------------+
| COMPILER=gcc-7.5.0 |
+----------------------------+
| DEFAULT_WAL_SYNCHRONOUS=1 |
+----------------------------+
| ENABLE_DBSTAT_VTAB |
+----------------------------+
| ENABLE_FTS3 |
+----------------------------+
| ENABLE_FTS3_PARENTHESIS |
+----------------------------+
| ENABLE_JSON1 |
+----------------------------+
| ENABLE_RTREE |
+----------------------------+
| ENABLE_UPDATE_DELETE_LIMIT |
+----------------------------+
| OMIT_DEPRECATED |
+----------------------------+
| OMIT_SHARED_CACHE |
+----------------------------+
| SYSTEM_MALLOC |
+----------------------------+
| THREADSAFE=1 |
+----------------------------+
PRAGMA directives may also be issued using the /db/execute or /db/query endpoint. For example:
$ curl -G 'localhost:4001/db/query?pretty&timings' --data-urlencode 'q=PRAGMA foreign_keys'
{
"results": [
{
"columns": [
"foreign_keys"
],
"types": [
""
],
"values": [
[
0
]
],
"time": 0.000070499
}
],
"time": 0.000540857
}$