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Changes In Branch memstat-vtab Excluding Merge-Ins
This is equivalent to a diff from 7fc2994434 to 9351135b43
2018-09-27
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17:03 | Add the sqlite_memstat extension - an eponymous virtual table that shows memory usages statistics for SQLite. (check-in: 954ef61f6a user: drh tags: trunk) | |
16:57 | Enhancements to sqlite_memstat: (1) Add an extra "schema" column to show the schema name for ZIPVFS stats. (2) Only show ZIPVFS stats to schema that use ZIPVFS (3) Put a NULL in unused columns of the output. (Closed-Leaf check-in: 9351135b43 user: drh tags: memstat-vtab) | |
15:45 | Add initial ZIPVFS support for the "main" database to the sqlite_memstat virtual table. (check-in: 9cd27350b0 user: drh tags: memstat-vtab) | |
15:21 | Initial prototype of a eponymous virtual table that accesses sqlite3_status64() and sqlite3_db_status(). (check-in: 0b44e1f68e user: drh tags: memstat-vtab) | |
14:24 | Minor enhancement to the pager so that it remembers if the underlying database files is immutable. (Leaf check-in: 64db614edd user: drh tags: immutable-pager) | |
13:10 | Disallow the use of window functions in the recursive part of a recursive CTE. Fix for ticket [e8275b415a2f03bee]. (check-in: b284957096 user: drh tags: branch-3.25) | |
12:14 | Disallow the use of window functions in the recursive part of a recursive CTE. Fix for ticket [e8275b415a2f03bee]. (check-in: 7fc2994434 user: dan tags: trunk) | |
00:04 | Minor simplification: In OP_ParseSchema, read the p1 register once. (check-in: bd250533a0 user: mistachkin tags: trunk) | |
Added ext/misc/memstat.c.
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In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file demonstrates an eponymous virtual table that returns information ** from sqlite3_status64() and sqlite3_db_status(). ** ** Usage example: ** ** .load ./memstat ** .mode quote ** .header on ** SELECT * FROM memstat; */ #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_MEMSTATVTAB) #if !defined(SQLITEINT_H) #include "sqlite3ext.h" #endif SQLITE_EXTENSION_INIT1 #include <assert.h> #include <string.h> #ifndef SQLITE_OMIT_VIRTUALTABLE /* memstat_vtab is a subclass of sqlite3_vtab which will ** serve as the underlying representation of a memstat virtual table */ typedef struct memstat_vtab memstat_vtab; struct memstat_vtab { sqlite3_vtab base; /* Base class - must be first */ sqlite3 *db; /* Database connection for this memstat vtab */ }; /* memstat_cursor is a subclass of sqlite3_vtab_cursor which will ** serve as the underlying representation of a cursor that scans ** over rows of the result */ typedef struct memstat_cursor memstat_cursor; struct memstat_cursor { sqlite3_vtab_cursor base; /* Base class - must be first */ sqlite3 *db; /* Database connection for this cursor */ int iRowid; /* Current row in aMemstatColumn[] */ int iDb; /* Which schema we are looking at */ int nDb; /* Number of schemas */ char **azDb; /* Names of all schemas */ sqlite3_int64 aVal[2]; /* Result values */ }; /* ** The memstatConnect() method is invoked to create a new ** memstat_vtab that describes the memstat virtual table. ** ** Think of this routine as the constructor for memstat_vtab objects. ** ** All this routine needs to do is: ** ** (1) Allocate the memstat_vtab object and initialize all fields. ** ** (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the ** result set of queries against memstat will look like. */ static int memstatConnect( sqlite3 *db, void *pAux, int argc, const char *const*argv, sqlite3_vtab **ppVtab, char **pzErr ){ memstat_vtab *pNew; int rc; /* Column numbers */ #define MSV_COLUMN_NAME 0 /* Name of quantity being measured */ #define MSV_COLUMN_SCHEMA 1 /* schema name */ #define MSV_COLUMN_VALUE 2 /* Current value */ #define MSV_COLUMN_HIWTR 3 /* Highwater mark */ rc = sqlite3_declare_vtab(db,"CREATE TABLE x(name,schema,value,hiwtr)"); if( rc==SQLITE_OK ){ pNew = sqlite3_malloc( sizeof(*pNew) ); *ppVtab = (sqlite3_vtab*)pNew; if( pNew==0 ) return SQLITE_NOMEM; memset(pNew, 0, sizeof(*pNew)); pNew->db = db; } return rc; } /* ** This method is the destructor for memstat_cursor objects. */ static int memstatDisconnect(sqlite3_vtab *pVtab){ sqlite3_free(pVtab); return SQLITE_OK; } /* ** Constructor for a new memstat_cursor object. */ static int memstatOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){ memstat_cursor *pCur; pCur = sqlite3_malloc( sizeof(*pCur) ); if( pCur==0 ) return SQLITE_NOMEM; memset(pCur, 0, sizeof(*pCur)); pCur->db = ((memstat_vtab*)p)->db; *ppCursor = &pCur->base; return SQLITE_OK; } /* ** Clear all the schema names from a cursor */ static void memstatClearSchema(memstat_cursor *pCur){ int i; if( pCur->azDb==0 ) return; for(i=0; i<pCur->nDb; i++){ sqlite3_free(pCur->azDb[i]); } sqlite3_free(pCur->azDb); pCur->azDb = 0; pCur->nDb = 0; } /* ** Fill in the azDb[] array for the cursor. */ static int memstatFindSchemas(memstat_cursor *pCur){ sqlite3_stmt *pStmt = 0; int rc; if( pCur->nDb ) return SQLITE_OK; rc = sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1, &pStmt, 0); if( rc ){ sqlite3_finalize(pStmt); return rc; } while( sqlite3_step(pStmt)==SQLITE_ROW ){ char **az, *z; az = sqlite3_realloc(pCur->azDb, sizeof(char*)*(pCur->nDb+1)); if( az==0 ){ memstatClearSchema(pCur); return SQLITE_NOMEM; } pCur->azDb = az; z = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 1)); if( z==0 ){ memstatClearSchema(pCur); return SQLITE_NOMEM; } pCur->azDb[pCur->nDb] = z; pCur->nDb++; } sqlite3_finalize(pStmt); return SQLITE_OK; } /* ** Destructor for a memstat_cursor. */ static int memstatClose(sqlite3_vtab_cursor *cur){ memstat_cursor *pCur = (memstat_cursor*)cur; memstatClearSchema(pCur); sqlite3_free(cur); return SQLITE_OK; } /* ** Allowed values for aMemstatColumn[].eType */ #define MSV_GSTAT 0 /* sqlite3_status64() information */ #define MSV_DB 1 /* sqlite3_db_status() information */ #define MSV_ZIPVFS 2 /* ZIPVFS file-control with 64-bit return */ /* ** An array of quantities that can be measured and reported by ** this virtual table */ static const struct MemstatColumns { const char *zName; /* Symbolic name */ unsigned char eType; /* Type of interface */ unsigned char mNull; /* Bitmask of which columns are NULL */ /* 2: dbname, 4: current, 8: hiwtr */ int eOp; /* Opcode */ } aMemstatColumn[] = { {"MEMORY_USED", MSV_GSTAT, 2, SQLITE_STATUS_MEMORY_USED }, {"MALLOC_SIZE", MSV_GSTAT, 6, SQLITE_STATUS_MALLOC_SIZE }, {"MALLOC_COUNT", MSV_GSTAT, 2, SQLITE_STATUS_MALLOC_COUNT }, {"PAGECACHE_USED", MSV_GSTAT, 2, SQLITE_STATUS_PAGECACHE_USED }, {"PAGECACHE_OVERFLOW", MSV_GSTAT, 2, SQLITE_STATUS_PAGECACHE_OVERFLOW }, {"PAGECACHE_SIZE", MSV_GSTAT, 6, SQLITE_STATUS_PAGECACHE_SIZE }, {"PARSER_STACK", MSV_GSTAT, 6, SQLITE_STATUS_PARSER_STACK }, {"DB_LOOKASIDE_USED", MSV_DB, 2, SQLITE_DBSTATUS_LOOKASIDE_USED }, {"DB_LOOKASIDE_HIT", MSV_DB, 6, SQLITE_DBSTATUS_LOOKASIDE_HIT }, {"DB_LOOKASIDE_MISS_SIZE", MSV_DB, 6, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE}, {"DB_LOOKASIDE_MISS_FULL", MSV_DB, 6, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL}, {"DB_CACHE_USED", MSV_DB, 10, SQLITE_DBSTATUS_CACHE_USED }, {"DB_CACHE_USED_SHARED", MSV_DB, 10, SQLITE_DBSTATUS_CACHE_USED_SHARED }, {"DB_SCHEMA_USED", MSV_DB, 10, SQLITE_DBSTATUS_SCHEMA_USED }, {"DB_STMT_USED", MSV_DB, 10, SQLITE_DBSTATUS_STMT_USED }, {"DB_CACHE_HIT", MSV_DB, 10, SQLITE_DBSTATUS_CACHE_HIT }, {"DB_CACHE_MISS", MSV_DB, 10, SQLITE_DBSTATUS_CACHE_MISS }, {"DB_CACHE_WRITE", MSV_DB, 10, SQLITE_DBSTATUS_CACHE_WRITE }, {"DB_CACHE_SPILL", MSV_DB, 10, SQLITE_DBSTATUS_CACHE_SPILL }, {"DB_DEFERRED_FKS", MSV_DB, 10, SQLITE_DBSTATUS_DEFERRED_FKS }, #ifdef SQLITE_ENABLE_ZIPVFS {"ZIPVFS_CACHE_USED", MSV_ZIPVFS, 8, 231454 }, {"ZIPVFS_CACHE_HIT", MSV_ZIPVFS, 8, 231455 }, {"ZIPVFS_CACHE_MISS", MSV_ZIPVFS, 8, 231456 }, {"ZIPVFS_CACHE_WRITE", MSV_ZIPVFS, 8, 231457 }, {"ZIPVFS_DIRECT_READ", MSV_ZIPVFS, 8, 231458 }, {"ZIPVFS_DIRECT_BYTES", MSV_ZIPVFS, 8, 231459 }, #endif /* SQLITE_ENABLE_ZIPVFS */ }; #define MSV_NROW (sizeof(aMemstatColumn)/sizeof(aMemstatColumn[0])) /* ** Advance a memstat_cursor to its next row of output. */ static int memstatNext(sqlite3_vtab_cursor *cur){ memstat_cursor *pCur = (memstat_cursor*)cur; int i; assert( pCur->iRowid<=MSV_NROW ); while(1){ i = (int)pCur->iRowid - 1; if( (aMemstatColumn[i].mNull & 2)!=0 || (++pCur->iDb)>=pCur->nDb ){ pCur->iRowid++; if( pCur->iRowid>MSV_NROW ) return SQLITE_OK; /* End of the table */ pCur->iDb = 0; i++; } pCur->aVal[0] = 0; pCur->aVal[1] = 0; switch( aMemstatColumn[i].eType ){ case MSV_GSTAT: { sqlite3_status64(aMemstatColumn[i].eOp, &pCur->aVal[0], &pCur->aVal[1],0); break; } case MSV_DB: { int xCur, xHiwtr; sqlite3_db_status(pCur->db, aMemstatColumn[i].eOp, &xCur, &xHiwtr, 0); pCur->aVal[0] = xCur; pCur->aVal[1] = xHiwtr; break; } case MSV_ZIPVFS: { int rc; rc = sqlite3_file_control(pCur->db, pCur->azDb[pCur->iDb], aMemstatColumn[i].eOp, (void*)&pCur->aVal[0]); if( rc!=SQLITE_OK ) continue; break; } } break; } return SQLITE_OK; } /* ** Return values of columns for the row at which the memstat_cursor ** is currently pointing. */ static int memstatColumn( sqlite3_vtab_cursor *cur, /* The cursor */ sqlite3_context *ctx, /* First argument to sqlite3_result_...() */ int iCol /* Which column to return */ ){ memstat_cursor *pCur = (memstat_cursor*)cur; int i; assert( pCur->iRowid>0 && pCur->iRowid<=MSV_NROW ); i = (int)pCur->iRowid - 1; if( (aMemstatColumn[i].mNull & (1<<iCol))!=0 ){ return SQLITE_OK; } switch( iCol ){ case MSV_COLUMN_NAME: { sqlite3_result_text(ctx, aMemstatColumn[i].zName, -1, SQLITE_STATIC); break; } case MSV_COLUMN_SCHEMA: { sqlite3_result_text(ctx, pCur->azDb[pCur->iDb], -1, 0); break; } case MSV_COLUMN_VALUE: { sqlite3_result_int64(ctx, pCur->aVal[0]); break; } case MSV_COLUMN_HIWTR: { sqlite3_result_int64(ctx, pCur->aVal[1]); break; } } return SQLITE_OK; } /* ** Return the rowid for the current row. In this implementation, the ** rowid is the same as the output value. */ static int memstatRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){ memstat_cursor *pCur = (memstat_cursor*)cur; *pRowid = pCur->iRowid*1000 + pCur->iDb; return SQLITE_OK; } /* ** Return TRUE if the cursor has been moved off of the last ** row of output. */ static int memstatEof(sqlite3_vtab_cursor *cur){ memstat_cursor *pCur = (memstat_cursor*)cur; return pCur->iRowid>MSV_NROW; } /* ** This method is called to "rewind" the memstat_cursor object back ** to the first row of output. This method is always called at least ** once prior to any call to memstatColumn() or memstatRowid() or ** memstatEof(). */ static int memstatFilter( sqlite3_vtab_cursor *pVtabCursor, int idxNum, const char *idxStr, int argc, sqlite3_value **argv ){ memstat_cursor *pCur = (memstat_cursor *)pVtabCursor; pCur->iRowid = 1; pCur->iDb = 0; return memstatFindSchemas(pCur); } /* ** SQLite will invoke this method one or more times while planning a query ** that uses the memstat virtual table. This routine needs to create ** a query plan for each invocation and compute an estimated cost for that ** plan. */ static int memstatBestIndex( sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo ){ pIdxInfo->estimatedCost = (double)500; pIdxInfo->estimatedRows = 500; return SQLITE_OK; } /* ** This following structure defines all the methods for the ** memstat virtual table. */ static sqlite3_module memstatModule = { 0, /* iVersion */ 0, /* xCreate */ memstatConnect, /* xConnect */ memstatBestIndex, /* xBestIndex */ memstatDisconnect, /* xDisconnect */ 0, /* xDestroy */ memstatOpen, /* xOpen - open a cursor */ memstatClose, /* xClose - close a cursor */ memstatFilter, /* xFilter - configure scan constraints */ memstatNext, /* xNext - advance a cursor */ memstatEof, /* xEof - check for end of scan */ memstatColumn, /* xColumn - read data */ memstatRowid, /* xRowid - read data */ 0, /* xUpdate */ 0, /* xBegin */ 0, /* xSync */ 0, /* xCommit */ 0, /* xRollback */ 0, /* xFindMethod */ 0, /* xRename */ 0, /* xSavepoint */ 0, /* xRelease */ 0, /* xRollbackTo */ }; #endif /* SQLITE_OMIT_VIRTUALTABLE */ int sqlite3MemstatVtabInit(sqlite3 *db){ int rc = SQLITE_OK; #ifndef SQLITE_OMIT_VIRTUALTABLE rc = sqlite3_create_module(db, "sqlite_memstat", &memstatModule, 0); #endif return rc; } #ifndef SQLITE_CORE #ifdef _WIN32 __declspec(dllexport) #endif int sqlite3_memstat_init( sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi ){ int rc = SQLITE_OK; SQLITE_EXTENSION_INIT2(pApi); #ifndef SQLITE_OMIT_VIRTUALTABLE rc = sqlite3MemstatVtabInit(db); #endif return rc; } #endif /* SQLITE_CORE */ #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_MEMSTATVTAB) */ |