feat(query): SHOW/TERMINATE SESSIONS

[katarinasupe]

Description

Documents SHOW SESSIONS and TERMINATE SESSIONS on the Transactions page and in the query privileges table. Also fixes two older statements on the same page: TERMINATE TRANSACTIONS $id (parameters were never accepted) and the new database column of SHOW TRANSACTIONS (memgraph/memgraph#4571).

Not done:

• SHOW TRANSACTIONS example outputs still show seven columns; I don't know what database shows on snapshot and GC rows.
• SHOW ACTIVE USERS also gained columns in #4571 (server-stats page).

Product PR

memgraph/memgraph#4577

Checklist

• For a product change: milestone set to the release and feature or bugfix label added
• For a product change: this PR is linked from the product PR's documentation checklist

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Project	Deployment	Actions	Updated
documentation	Ready	Preview	Oct 7, 2026 11:52am UTC

[andrejtonev]

Thanks for writing this up! I checked every statement against current master (6e9c79da3), on a live instance as well as in the code. Most of it is accurate. The inline comments cover two statements that are wrong for 3.14 (SESSIONS isn't reserved, and the forced-DROP DATABASE example no longer applies after #4843), a few that overstate what happens (killed: true, "running query is aborted"), and some behaviour that's missing: open-transaction rollback, what the client sees and driver retries, auth disabled, Community vs Enterprise, impersonation, coordinators, LOGOFF and $id parameters. Every suggestion was re-run against master.

Three things outside this diff:

1. TERMINATE TRANSACTIONS $id (around line 340): "A parameterized id is treated exactly like a literal one, so running TERMINATE TRANSACTIONS $id with $id = "*" also terminates everything." This has never worked. The grammar only accepts a literal there (transactionId : literal, unchanged since the query was added), so TERMINATE TRANSACTIONS $id is a syntax error (extraneous input '$' expecting ...) whatever $id is. The sentence came in with v3.13 (#1689). Suggested replacement: "Transaction ids, including "*", must be string literals. Query parameters such as $id aren't supported and cause a syntax error."
2. SHOW TRANSACTIONS columns (line 95): since memgraph#4571 (3.14, listed under breaking changes in #1764), SHOW TRANSACTIONS returns an 8th column, database, after elapsed_ms. The page still says "contains seven columns", and the column table and example outputs don't include it. Suggested row: | database | String | The database the transaction is running on. |
3. PR description: it says the SHOW TRANSACTIONS fix is internal and "the release note already covers it". It doesn't: on release/3.14 the only #4577 entry is the feature line. I've suggested a bug-fix line on #1764.