Errors
Runtime errors¶
| error | example | explanation |
|---|---|---|
| access | Attempt to read files above directory, run system commands or failed usr/pwd | |
| accp | Tried to accept an incoming TCP/IP connection but failed to do so | |
| adict | d[::]:x | Blocked assignment ('nyi) |
| arch | :test set til 100-17!`:test | Attempt to load file of wrong endian format |
| assign | cos:12 | Attempt to redefine a reserved word |
| badtail | Incomplete transaction at end of file, get good (count;length) with -11!(-2;`:file) | |
| can't | Only commercially licensed kdb+ instances can encrypt code in a script | |
| cast | s:`a`b; c:`s$`a`e | Value not in enumeration |
| conn | Too many connections (1022 max) | |
| d8 | The log had a partial transaction at the end but q couldn’t truncate the file | |
| domain | til -1 | Out of domain |
| elim | ((-58?`3) set\:(),`a)$`a | Too many enumerations (max: 57) |
| from | select price trade | Badly formed select statement |
| glim | `g# limit (99 prior to V3.2, now unlimited | |
| hop | Request to hopen a handle fails; includes message from OS | |
| hwr | Handle write error, can't write inside a peach | |
| insert | t:([k:0 1]a:2 3);`t insert(0;3) | Attempt to insert a record with an existing key into a keyed table |
| length | ()+til 1 | Incompatible lengths |
| limit | 0W#2 |
Tried to generate a list longer than 2,000,000,000, or serialized object is > 2GB, or 'type if trying to serialize a nested object which has > 2 billion elements |
| loop | a::a | Dependency loop |
| mismatch | ([]a:til 4),([]b:til 3) | Columns that can't be aligned for R,R or K,K |
| Mlim | Too many nested columns in splayed tables. (Prior to V3.0, limited to 999; from V3.0, 251; from V3.3, 65530) | |
| mq | Multi-threading not allowed | |
| noamend | t:([]a:1 2 3)n:`a`b`cupdate b:{`n?`d;:`n?`d}[]from `t | Cannot change global state from within an amend |
| no append to zipped enums | V2:.z.zd:17 2 6`:sym?`a`bV3: `:sym?`c | Cannot append to zipped enum (from V3.0) |
no `g# |
{`g#x}peach 2#enlist 0 1 |
A thread other than the main q thread has attempted to add a group attribute to a vector. Seen with peach+slave threads or multithreaded input queue |
| noupdate | {a::x}peach 0 1 |
Updates blocked by the -b cmd line arg,
or reval code or a thread other than the main thread has attempted to update a global variable
when in peach+slave threads or multithreaded input queue.
Update not allowed when using negative port number.
|
| nosocket | Can only open or use sockets in main thread. | |
| nyi | "a"like"**" | Not yet implemented: it probably makes sense, but it’s not defined nor implemented, and needs more thinking about as the language evolves |
| os | \foo bar | Operating-system error or license error |
| par | Trying to update a partitioned table | |
| parse | Invalid syntax | |
| part | Something wrong with the partitions in the HDB | |
| path too long | $":",1000#"a") set 1 2 3 | File path too long |
| pl | peach can’t handle parallel lambdas (V2.3 only) | |
| pwuid | OS is missing libraries for getpwuid. (Most likely 32-bit app on 64-bit OS. Try to install ia32-libs.) | |
| Q7 | nyi op on file nested array | |
| rank | +[2;3;4] | Invalid rank |
| rb | Encountered a problem while doing a blocking read | |
| restricted | 0"2+3" | in a kdb+ process which was started with -b cmd line. Also for a kdb+ process using the username:password authentication file, or the -b cmd line option, \x cannot be used to reset handlers to their default. e.g. \x .z.pg |
| s-fail | `s#3 2 | Invalid attempt to set “sorted” attribute. Also encountered with `s#enums when loading a database (\l db) and enum target is not already loaded. |
| splay | nyi op on splayed table | |
| stack | {.z.s[]}[] |
Ran out of stack space. Consider using
converge-iterate \ or converge-repeat /
instead of recursion.
|
| step | d:`s#`a`b!1 2;`d upsert `c`d!3 4 | Attempt to upsert a step dictionary in place |
| stop | User interrupt (Ctrl-c) or time limit (-T) | |
| stype | '42 | Invalid type used to signal |
| sys | {system "ls"}peach 0 1 | Using system call from thread other than main thread |
| threadview | Trying to calc a view in a thread other than main thread. A view can be calculated in the main thread only. The cached result can be used from other threads. | |
| timeout | Request to hopen a handle fails on a timeout; includes message from OS | |
| too many syms | Kdb+ currently allows for ~1.4B interned symbols in the pool and will exit with this error when this threshold is reached. | |
| trunc | The log had a partial transaction at the end but q couldn’t truncate the file. | |
| type | til 2.2 | Wrong type. Also see 'limit. |
| type/attr error amending file | Direct update on disk for this type or attribute is not allowed | |
| u-fail | `u#2 2 | Invalid attempt to set “unique” attribute |
| unmappable | t:([]sym:`a`b;a:(();())).Q.dpft[`:thdb;.z.d;`sym;`t] | When saving partitioned data each column must be mappable. () and ("";"";"") are OK |
| upd | Function upd is undefined (sometimes encountered during -11!`:logfile) or license error | |
| utf8 | The websocket requires that text is UTF-8 encoded | |
| value | No value | |
| vd1 | Attempted multithread update | |
| view | Trying to re-assign a view to something else | |
| wsfull | 999999999#0j |
malloc failed, ran out of swap (or addressability on 32-bit), or hit -w limit
|
| wsm | 010b wsum 010b | Alias for nyi for wsum prior to V3.2 |
| XXX | delete x from system "d";x | Value error (XXX undefined) |
System errors¶
From file ops and IPC
| error | explanation |
|---|---|
XXX:YYY | XXX is from kdb+, YYY from the OS |
XXX from addr, close, conn, p(from -p), snd, rcv or (invalid) filename, e.g. read0:invalidname.txt`
Parse errors¶
On execute or load
| error | example | explanation |
|---|---|---|
[({])}" | "hello | Open ([{ or " |
| branch | a:"1;",254#"0;"value "{if[",a,"]}" | A branch (if;do;while;$[.;.;.]) more than 255 byte codes away |
| char | value "\000" | Invalid character |
| constants | a:";"sv string 2+til 97;value"{",a,"}" | Too many constants (max 95) |
| globals | a:"::a"sv string til 32;value"{a",a,"::0}" | Too many global variables (31 max) |
| locals | a:":a"sv string til 24;value"{a",a,":0}" | Too many local variables (23 max) |
| params | f:{[a;b;c;d;e;f;g;h;e]} | Too many parameters (8 max) |
License errors¶
On launch
| error | explanation |
|---|---|
| cores | The license is for fewer cores than available |
| cpu | The license is for fewer CPUs than available |
| exp | License expiry date is prior to system date |
| host |
The hostname reported by the OS does not match the hostname or hostname-pattern in the license.
If you see 255.255.255.255 in the kdb+ banner, the machine almost certainly cannot resolve its hostname to an IP address,
which will cause a 'host error.
|
| k4.lic |
k4.lic file not found, check contents of environment variables
QHOME and
QLIC
|
| os | Wrong OS or operating-system error (if runtime error) |
| srv | Client-only license in server mode |
| upd | Version of kdb+ more recent than update date, or the function upd is undefined (sometimes encountered during -11!`:logfile) |
| user | Unlicenced user |
| wha | System date is prior to kdb+ version date |